WO2004069284A2 - Ultrasound contrast agents and process for the preparation thereof - Google Patents
Ultrasound contrast agents and process for the preparation thereof Download PDFInfo
- Publication number
- WO2004069284A2 WO2004069284A2 PCT/IB2004/000243 IB2004000243W WO2004069284A2 WO 2004069284 A2 WO2004069284 A2 WO 2004069284A2 IB 2004000243 W IB2004000243 W IB 2004000243W WO 2004069284 A2 WO2004069284 A2 WO 2004069284A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phospholipid
- emulsion
- microbubbles
- aqueous
- gas
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title description 23
- 230000008569 process Effects 0.000 title description 23
- 239000002961 echo contrast media Substances 0.000 title description 9
- 150000003904 phospholipids Chemical class 0.000 claims abstract description 141
- 239000000839 emulsion Substances 0.000 claims abstract description 112
- 239000000725 suspension Substances 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000009826 distribution Methods 0.000 claims abstract description 41
- 239000003960 organic solvent Substances 0.000 claims abstract description 41
- 239000002872 contrast media Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000012736 aqueous medium Substances 0.000 claims abstract description 26
- 239000007900 aqueous suspension Substances 0.000 claims abstract description 20
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 115
- 239000007789 gas Substances 0.000 claims description 104
- -1 cydodextrins Chemical compound 0.000 claims description 78
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol Substances OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 37
- 150000001875 compounds Chemical class 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 32
- 238000004108 freeze drying Methods 0.000 claims description 28
- 230000008685 targeting Effects 0.000 claims description 28
- 239000003446 ligand Substances 0.000 claims description 27
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 25
- 229930195729 fatty acid Natural products 0.000 claims description 25
- 239000000194 fatty acid Substances 0.000 claims description 25
- 238000013019 agitation Methods 0.000 claims description 24
- 229920001223 polyethylene glycol Polymers 0.000 claims description 23
- 239000002904 solvent Substances 0.000 claims description 23
- KLFKZIQAIPDJCW-HTIIIDOHSA-N Dipalmitoylphosphatidylserine Chemical compound CCCCCCCCCCCCCCCC(=O)OCC(COP(O)(=O)OC[C@H](N)C(O)=O)OC(=O)CCCCCCCCCCCCCCC KLFKZIQAIPDJCW-HTIIIDOHSA-N 0.000 claims description 22
- 229910052783 alkali metal Inorganic materials 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000003384 imaging method Methods 0.000 claims description 20
- 230000001804 emulsifying effect Effects 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 19
- 150000004665 fatty acids Chemical class 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 238000002604 ultrasonography Methods 0.000 claims description 18
- NRJAVPSFFCBXDT-HUESYALOSA-N 1,2-distearoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCCCCCCCCCCCC NRJAVPSFFCBXDT-HUESYALOSA-N 0.000 claims description 17
- 150000002632 lipids Chemical group 0.000 claims description 17
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 16
- 229930195725 Mannitol Natural products 0.000 claims description 16
- 239000000594 mannitol Substances 0.000 claims description 16
- 235000010355 mannitol Nutrition 0.000 claims description 16
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- 238000010438 heat treatment Methods 0.000 claims description 13
- 150000002430 hydrocarbons Chemical class 0.000 claims description 13
- TZCPCKNHXULUIY-RGULYWFUSA-N 1,2-distearoyl-sn-glycero-3-phosphoserine Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(=O)OC[C@H](N)C(O)=O)OC(=O)CCCCCCCCCCCCCCCCC TZCPCKNHXULUIY-RGULYWFUSA-N 0.000 claims description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 229930195733 hydrocarbon Natural products 0.000 claims description 12
- YFWHNAWEOZTIPI-DIPNUNPCSA-N 1,2-dioctadecanoyl-sn-glycerol-3-phosphate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(O)=O)OC(=O)CCCCCCCCCCCCCCCCC YFWHNAWEOZTIPI-DIPNUNPCSA-N 0.000 claims description 11
- YKIOPDIXYAUOFN-UHFFFAOYSA-N 2,3-di(icosanoyloxy)propyl 2-(trimethylazaniumyl)ethyl phosphate Chemical compound CCCCCCCCCCCCCCCCCCCC(=O)OCC(COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCCCCCCCCCCCCCC YKIOPDIXYAUOFN-UHFFFAOYSA-N 0.000 claims description 11
- 238000002059 diagnostic imaging Methods 0.000 claims description 11
- PORPENFLTBBHSG-MGBGTMOVSA-N 1,2-dihexadecanoyl-sn-glycerol-3-phosphate Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(O)=O)OC(=O)CCCCCCCCCCCCCCC PORPENFLTBBHSG-MGBGTMOVSA-N 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- LVNGJLRDBYCPGB-UHFFFAOYSA-N 1,2-distearoylphosphatidylethanolamine Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(COP([O-])(=O)OCC[NH3+])OC(=O)CCCCCCCCCCCCCCCCC LVNGJLRDBYCPGB-UHFFFAOYSA-N 0.000 claims description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
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- 150000003839 salts Chemical class 0.000 claims description 9
- SLKDGVPOSSLUAI-PGUFJCEWSA-N 1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine zwitterion Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(=O)OCCN)OC(=O)CCCCCCCCCCCCCCC SLKDGVPOSSLUAI-PGUFJCEWSA-N 0.000 claims description 8
- BIABMEZBCHDPBV-MPQUPPDSSA-N 1,2-palmitoyl-sn-glycero-3-phospho-(1'-sn-glycerol) Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(=O)OC[C@@H](O)CO)OC(=O)CCCCCCCCCCCCCCC BIABMEZBCHDPBV-MPQUPPDSSA-N 0.000 claims description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 8
- 150000008282 halocarbons Chemical class 0.000 claims description 8
- LGUZHRODIJCVOC-UHFFFAOYSA-N perfluoroheptane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F LGUZHRODIJCVOC-UHFFFAOYSA-N 0.000 claims description 8
- ZJIJAJXFLBMLCK-UHFFFAOYSA-N perfluorohexane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F ZJIJAJXFLBMLCK-UHFFFAOYSA-N 0.000 claims description 8
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- FVJZSBGHRPJMMA-IOLBBIBUSA-N PG(18:0/18:0) Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@H](COP(O)(=O)OC[C@@H](O)CO)OC(=O)CCCCCCCCCCCCCCCCC FVJZSBGHRPJMMA-IOLBBIBUSA-N 0.000 claims description 7
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 7
- 239000008365 aqueous carrier Substances 0.000 claims description 7
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 7
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- 150000004676 glycans Chemical class 0.000 claims description 7
- QYSGYZVSCZSLHT-UHFFFAOYSA-N octafluoropropane Chemical compound FC(F)(F)C(F)(F)C(F)(F)F QYSGYZVSCZSLHT-UHFFFAOYSA-N 0.000 claims description 7
- 239000005017 polysaccharide Substances 0.000 claims description 7
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 claims description 6
- 229920001612 Hydroxyethyl starch Polymers 0.000 claims description 6
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 6
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- 229940050526 hydroxyethylstarch Drugs 0.000 claims description 6
- 150000002576 ketones Chemical class 0.000 claims description 6
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- QIROQPWSJUXOJC-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6-undecafluoro-6-(trifluoromethyl)cyclohexane Chemical compound FC(F)(F)C1(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C1(F)F QIROQPWSJUXOJC-UHFFFAOYSA-N 0.000 claims description 5
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- NEZDNQCXEZDCBI-UHFFFAOYSA-N 2-azaniumylethyl 2,3-di(tetradecanoyloxy)propyl phosphate Chemical compound CCCCCCCCCCCCCC(=O)OCC(COP(O)(=O)OCCN)OC(=O)CCCCCCCCCCCCC NEZDNQCXEZDCBI-UHFFFAOYSA-N 0.000 claims description 5
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- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 5
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
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- 229940052308 general anesthetics halogenated hydrocarbons Drugs 0.000 claims description 5
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/22—Echographic preparations; Ultrasound imaging preparations ; Optoacoustic imaging preparations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/22—Echographic preparations; Ultrasound imaging preparations ; Optoacoustic imaging preparations
- A61K49/222—Echographic preparations; Ultrasound imaging preparations ; Optoacoustic imaging preparations characterised by a special physical form, e.g. emulsions, liposomes
- A61K49/223—Microbubbles, hollow microspheres, free gas bubbles, gas microspheres
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/19—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles lyophilised, i.e. freeze-dried, solutions or dispersions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
Definitions
- the present invention relates to a process for the preparation of a dry or lyophilized formulation useful for preparing a gas containing contrast agent usable in diagnostic imaging and to a process for preparing said gas containing contrast agent.
- the invention also includes dry formulations prepared by this process, which may be reconstituted to form contrast agent suspensions useful in diagnostic imaging.
- the invention further includes suspensions of gas filled microbubbles useful in diagnostic imaging prepared using dry formulations of the invention as well as containers or two component kits containing the dry formulations of the invention.
- ultrasound contrast agents in the recent years has generated a number of different formulations, which are useful in ultrasound imaging of organs and tissue of human or animal body. These agents are designed to be used primarily as intravenous or intra-arterial injectables in conjunction with the use of medical echographic equipment which employs for example, B-mode image formation (based on the spatial distribution of backscatter tissue properties) or Doppler signal processing (based on Continuous Wave or pulsed Doppler processing of ultrasonic echoes to determine blood or liquid flow parameters).
- B-mode image formation based on the spatial distribution of backscatter tissue properties
- Doppler signal processing based on Continuous Wave or pulsed Doppler processing of ultrasonic echoes to determine blood or liquid flow parameters.
- a first category of stabilized bubbles or microvesicles is generally referred to in the art as "microbubbles" and includes aqueous suspensions in which the bubbles of gas are bounded at the gas/liquid interface by a very thin envelope involving a surfactant (i.e. an amphiphilic material) disposed at the gas to liquid interface.
- a second category of microvesicles is generally referred to in the art as "microballoons" or “microcapsules” and includes suspensions in which the bubbles of gas are surrounded by a solid material envelope formed of natural or synthetic polymers. Examples of microballoons and of the preparation thereof are disclosed, for instance, in European patent application EP 0458745.
- Microbubbles suspensions are typically prepared by contacting powdered amphiphilic materials, e.g. freeze-dried preformed liposomes or freeze-dried or spray-dried phospholipid suspensions, with air or other gas and then with aqueous carrier, agitating to generate a microbubble suspension which must then be administered shortly after its preparation.
- powdered amphiphilic materials e.g. freeze-dried preformed liposomes or freeze-dried or spray-dried phospholipid suspensions
- W097/29783 discloses an alternative process for preparing gas microbubbles suspensions, comprising generating a gas microbubble dispersion in an appropriate phospholipid-containing aqueous medium and thereafter subjecting the dispersion to lyophilisation to yield a dried reconstitutable product.
- the so prepared dried products are reconstitutable in aqueous media requiring only minimal agitation.
- the size of the so generated microbubbles is consistently reproducible and in practice is independent from the amount of agitation energy applied during reconstitution, being determined by the size of the microbubbles formed in the initial microbubble dispersion.
- the process is said to result into an emulsion with particles' size lower than 4 ⁇ m, preferably lower than 2 ⁇ m, down to 0.5 ⁇ m.
- the Applicant has however noticed that while the reconstitution step may finally result in microvesicles having a numerical mean diameter of less than 2 ⁇ m, the corresponding size distribution of the microvesicles population is nevertheless relatively broad.
- the conversion step from the emulsion microparticles, obtained according to the above process, into gas microbubbles results in rather low yield.
- the Applicant has now found that a much narrower distribution of microbubbles size can be obtained if a phospholipid is used as the main emulsifier of the above emulsion and if the above process is conducted in the substantial absence of the above water-insoluble structure-builders.
- the substantial absence of said water-insoluble structure-builders allows to substantially increase the conversion yield from emulsion microparticles into gas microbubbles.
- the Applicant has further observed that the above process may result in a further narrower size distribution of microbubbles and in an increased yield if the phospholipid is essentially the only emulsifier present in the emulsion.
- the Applicant has also found that by applying a rather low agitation energy to an aqueous-organic emulsion during the process as above specified, it is possible to obtain microbubbles having a very small diameter and reduced size distribution.
- An aspect of the present invention relates to a method for preparing a lyophilized matrix which, upon contact with an aqueous carrier liquid and a gas, is reconstitutable into a suspension of gas-filled microbubbles stabilized predominantly by a phospholipid, said method comprising the steps of: a) preparing an aqueous-organic emulsion comprising i) an aqueous medium, ii) an organic solvent substantially immiscible with water; iii) an emulsifying composition of amphiphilic materials comprising more than 50% by weight of a phospholipid and iv) a lyoprotecting agent; b) lyophilizing said emulsified mixture, to obtain a lyophilized matrix comprising said phospholipid.
- Another aspect of the present invention relates to a process for preparing an injectable contrast agent comprising a liquid aqueous suspension of gas-filled microbubbles stabilized predominantly by a phospholipid, which comprises the steps of: a) preparing an aqueous-organic emulsion comprising i) an aqueous medium, ii) an organic solvent substantially immiscible with water; iii) an emulsifying composition of amphiphilic materials comprising more than 50% by weight of a phospholipid and iv) a lyoprotecting agent; b) lyophilizing said emulsion, to obtain a lyophilized matrix comprising said phospholipid.
- the step a) of preparing the emulsion comprises: al) preparing a suspension by dispersing the emulsifying composition of amphiphilic materials and the lyoprotective agent in the aqueous medium; a2) admixing the obtained suspension with the organic solvent; a3) submitting the mixture to controlled agitation, to obtain an emulsion.
- the controlled agitation according to step a3) is obtained by using a high pressure homogenizer or more preferably a rotor-stator homogenizer.
- a further aspect of the invention relates to an injectable contrast agent comprising a suspension of gas-filled microbubbles stabilized by a stabilizing layer predominantly comprising a phospholipid in an aqueous carrier liquid, wherein said microbubbles have a number mean diameter (D N ) of less than 1.70 ⁇ m and a volume median diameter (D V50 ) such that the D so/D N ratio is of about 2.00 or lower.
- D N number mean diameter
- D V50 volume median diameter
- an aspect of the present invention relates to a method for preparing a lyophilized matrix of a reconstitutable suspension of gas-filled microbubbles predominantly stabilized by a phospholipid , said method comprising the preparation of an aqueous-organic emulsion comprising i) an aqueous medium, ii) an organic solvent substantially immiscible with water; iii) a phospholipid and iv) a lyoprotecting agent, and the subsequent lyophilizing of said emulsion.
- Suitable aqueous liquid carriers are water, typically sterile, pyrogen free water (to prevent as much as possible contamination in the intermediate lyophilized product), aqueous solutions such as saline (which may advantageously be balanced so that the final product for injection is not hypotonic), or aqueous solutions of one or more tonicity adjusting substances such as salts or sugars, sugar alcohols, glycols or other non-ionic polyol materials (eg. glucose, sucrose, sorbitol, mannitol, glycerol, polyethylene glycols, propylene glycols and the like).
- aqueous solutions such as saline (which may advantageously be balanced so that the final product for injection is not hypotonic), or aqueous solutions of one or more tonicity adjusting substances such as salts or sugars, sugar alcohols, glycols or other non-ionic polyol materials (eg. glucose, sucrose, sorbitol, mannitol, glycerol,
- substantially immiscible with water referred to the organic solvent means that, when said solvent is admixed with water, two separate phases are formed.
- Water immiscible solvent are generally also known in the art as apolar or non-polar solvents, as opposed to polar solvents (such as water).
- Water immiscible solvents are in general substantially insoluble in water.
- organic solvents suitable for being emulsified with the aqueous solvent are typically those solvents having a solubility in water of less than about 10 g/l.
- the solubility of said solvent in water is of about 1.0 g/l or lower, more preferably about 0.2 g/l or lower and much more preferably about 0.01 g/l or lower.
- Particularly preferred solvents are those having a solubility in water of 0.001 g/l or lower.
- Particularly insoluble organic solvents e.g. perfluorocarbons
- the organic solvent is preferably lyophilisable, i.e. said solvent has a sufficiently high vapour pressure at the lyophilization temperatures, e.g. between -30°C and 0°C, to allow for an effective and complete evaporation/sublimation within acceptable times, e.g. 24-48 hours.
- the vapour pressure of the organic solvent is higher than about 0.2 kPa at 25°C
- the organic solvent can be selected from a broad range of solvents and any chemical entity that is water-immiscible and lyophilisable, as indicated above, and being preferably liquid at room temperature (25°C). If a solvent having a boiling point lower than room temperature is used, the vessel containing the emulsifying mixture can advantageously be cooled below the boiling point of said solvent, e.g. down to 5°C or 0°C. As said solvent will be completely removed during the lyophilization step, no particular constraints exist except that it should not contain contaminants that cannot be removed through lyophilisation or that are not acceptable for use in an injectable composition.
- Suitable organic solvents include but are not limited to alkanes, such as branched or, preferably, linear (C 5 -C ⁇ 0 ) alkanes, e.g. pentane, hexane, heptane, octane, nonane, decane; alkenes, such as (C 5 -C ⁇ 0 ) alkenes, e.g. 1-pentene, 2- pentene, 1-octene; cyclo-alkanes, such as (C 5 -C 8 )-cycloalkanes optionally substituted with one or two methyl groups, e.g.
- alkanes such as branched or, preferably, linear (C 5 -C ⁇ 0 ) alkanes, e.g. pentane, hexane, heptane, octane, nonane, decane
- alkenes such as (C 5 -C ⁇ 0
- cyclopentane cyclohexane, cyclooctane, 1-methyl-cyclohexane
- aromatic hydrocarbons such as benzene and benzene derivatives substituted by one or two methyl or ethyl groups, e.g.
- the amount of solvent is generally comprised from about 1% to about 50% by volume with respect to the amount of water used for the emulsion. Preferably said amount is from about 1% to about 20%, more preferably from about 2% to about 15% and even more preferably from about 5% to about 10%. If desired, a mixture of two or more of the above listed organic solvents can be used, the overall amount of organic solvent in the emulsifying mixture being within the above range.
- lyoprotective agents can be used singularly or as mixtures of one or more compounds.
- Preferred lyoprotectants include mannitol and polysaccharides such as dextrans (in particular those with molecular weights above 1500 daltons), inulin, soluble starch, and hydroxyethyl starch.
- mannitol or polysaccharides such as dextrans, inulin, soluble starch, hydroxyethyl starch with saccharides such as glucose, maltose, lactose, sucrose, trehalose and erythritol also provide excellent results.
- the present invention is not limited to any particular amount of lyoprotectant used.
- the optimal weight concentration of lyoprotective agents in the emulsion prior to the lyophilisation is comprised between about 1 and about 25 %, preferably between about 2 and about 20 %, and even more preferably between about 5 and about 10 %.
- a higher amount can be employed if it is also necessary to provide a desired "bulk" to the lyophilized product.
- the term phospholipid is intended to encompass any amphiphilic phospholipidic compound the molecules of which are capable of forming a film of material (typically in the form of a mono-molecular layer) at the gas-water boundary interface in the final microbubbles suspension. Accordingly, these material are also referred to in the art as "film-forming phospholipids".
- these amphiphilic compounds are typically disposed at the interface between the aqueous medium and the organic solvent substantially insoluble in water, thus stabilizing the emulsified solvent microdroplets.
- the film formed by these compounds at the gas-water or water-solvent interface can be either continuous or discontinuous. In the latter case, the discontinuities in the film should not however be such as to impair the stability (e.g. pressure resistance, resistance to coalescence, etc.) of the suspended microbubbles or of the emulsified microdroplets, respectively.
- Fatty acids residues present in the phospholipids are in general long chain aliphatic acids, typically containing from 12 to 24 carbon atoms, preferably from 14 to 22; the aliphatic chain may contain one or more unsaturations or is preferably completely saturated.
- suitable fatty acids included in the phospholipids are, for instance, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, oleic acid, linoleic acid, and linolenic acid.
- saturated fatty acids such as myristic acid, palmitic acid, stearic acid and arachidic acid are employed.
- phospholipids examples include natural lecithins (phosphatidylcholine (PC) derivatives) such as, typically, soya bean or egg yolk lecithins.
- PC phosphatidylcholine
- Examples of semisynthetic phospholipids are the partially or fully hydrogenated derivatives of the naturally occurring lecithins.
- Preferred phospholipids are fatty acids di-esters of phosphatidylcholine, ethylphosphatidylcholine, phosphatidylglycerol, phosphatidic acid, phosphatidylethanolamine, phosphatidylserine or of sphingomyelin.
- phospholipids are, for instance, dilauroyl- phosphatidylcholine (DLPC), dimyristoyl-phosphatidylcholine (DMPC), dipalmitoyl-phosphatidylcholine (DPPC), diarachidoyl-phosphatidylcholine (DAPC), distearoyl-phosphatidylcholine (DSPC), dioleoyl-phosphatidylcholine (DOPC), 1,2 Distearoyl-sn-glycero-3-Ethylphosphocholine (Ethyl-DSPC), dipentadecanoyl-phosphatidylcholine (DPDPC), l-myristoyl-2-palmitoyl- phosphatidylcholine (MPPC), l-palmitoyl-2-myristoyl-phosphatidylcholine (PMPC), l-palmitoyl-2-stearoyl-phosphatidylcholine (PSPC), l-my
- DMPG dipalmitoylphosphatidylglycerol
- DSPG distearoylphosphatidylglycerol
- DOPG dioleoyl-phosphatidylglycerol
- dimyristoyl phosphatidic acid DMPA
- DPPA dipalmitoyl phosphatidic acid
- DSPA distearoyl phosphatidic acid
- DAPA diarachidoylphosphatidic acid
- DOPE dioleylphosphatidyl- ethanolamine
- DMPS diarachidoyl phosphatidylserine
- DAPS dipalmitoyl phosphatidylserine
- DPPS dipalmitoyl phosphatidylserine
- DSPS distearoylphosphatidylserine
- DOPS dioleoylphosphatidylserine
- DPSP dipalmitoyl sphingomyelin
- DSSP distearoylsphingomyelin
- phospholipid further includes modified phospholipid, e.g. phospholipids where the hydrophilic group is in turn bound to another hydrophilic group.
- modified phospholipids are phosphatidylethanolamines modified with polyethylenglycol (PEG), i.e. phosphatidylethanolamines where the hydrophilic ethanolamine moiety is linked to a PEG molecule of variable molecular weight e.g. from 300 to 5000 daltons, such as DPPE-PEG or DSPE-PEG, i.e. DPPE (or DSPE) having a PEG polymer attached thereto.
- PEG polyethylenglycol
- DPPE-PEG2000 refers to DPPE having attached thereto a PEG polymer having a mean average molecular weight of about 2000.
- these PEG-modified phospholipids are preferably used in combination with non-modified phospholipids.
- Examples of phospholipids bearing an overall negative charge are derivatives, in particular fatty acid di-esters, of phosphatidylserine, such as DMPS, DPPS, DSPS; of phosphatidic acid, such as DMPA, DPPA, DSPA; of phosphatidylglycerol such as DMPG, DPPG and DSPG.
- phosphatidylserine such as DMPS, DPPS, DSPS
- phosphatidic acid such as DMPA, DPPA, DSPA
- phosphatidylglycerol such as DMPG, DPPG and DSPG.
- modified phospholipids in particular PEG-modified phosphatidylethanolamines, such as DMPE-PEG750, DMPE-PEG1000, DMPE-PEG2000, DMPE-PEG3000, DMPE- PEG4000, DMPE-PEG5000, DPPE-PEG750, DPPE-PEG1000, DPPE-PEG2000,
- PEG-modified phosphatidylethanolamines such as DMPE-PEG750, DMPE-PEG1000, DMPE-PEG2000, DMPE-PEG3000, DMPE- PEG4000, DMPE-PEG5000, DPPE-PEG750, DPPE-PEG1000, DPPE-PEG2000,
- DPPE-PEG3000, DPPE-PEG4000, DPPE-PEG5000, DSPE-PEG750, DSPE- PEG1000,DSPE-PEG2000, DSPE-PEG3000, DSPE-PEG4000, DSPE- PEG5000,DAPE-PEG750, DAPE-PEG1000, DAPE-PEG2000, DAPE-PEG3000, DAPE-PEG4000 or DAPE-PEG5000 can be used as negatively charged molecules.
- the lyso- form of the above cited phospholipids such as lysophosphatidylserine derivatives (e.g.
- lyso-DMPS, -DPPS or -DSPS can advantageously be used as negatively charged compound.
- lyso-DMPS, -DPPS or -DSPS lysophosphatidic acid derivatives
- lysophosphatidylglycerol derivatives e.g. lyso-DMPG, -DPPG or -DSPG
- Examples of phospholipids bearing an overall positive charge are derivatives of ethylphosphatidylcholine, in particular esters of ethylphosphatidylcholine with fatty acids, such as l,2-Distearoyl-sn-glycero-3- Ethylphosphocholine (Ethyl-DSPC or DSEPC), l,2-Dipalmitoyl-sn-glycero-3- Ethylphosphocholine (Ethyl-DPPC or DPEPC).
- esters of ethylphosphatidylcholine with fatty acids such as l,2-Distearoyl-sn-glycero-3- Ethylphosphocholine (Ethyl-DSPC or DSEPC), l,2-Dipalmitoyl-sn-glycero-3- Ethylphosphocholine (Ethyl-DPPC or DPEPC).
- blends of two or more phospholipids are employed. More preferably, blends of two or more phospholipids, at least one with neutral and at least one with negative charge are employed.
- the amount of charged phospholipid may vary from about 95% to about 5% by weight, with respect to the total amount of phospholipid, preferably from 80% to 20% by weight.
- the presence of at least minor amounts, such as 5% to 20 % by wt. with respect to the total weight of phospholipid, of a (negatively) charged phospholipid may help preventing aggregation of bubbles or emulsion droplets. It is however possible to use a single phospholipid, neutral or charged, or a blend of two or more phospholipids, all neutral or all with an overall net charge.
- Preferred mixtures of phospholipids are mixtures of DPPS with DPPC, DSPC or DAPC (from 95/5 to 5/95 w/w), mixtures of DSPA with DSPC or DAPC (from 95/5 to 5/95 w/w) , mixtures or DSPG or DPPG with DSPC or mixtures of DSPC with Ethyl-DSPC. Most preferred are mixtures of DPPS/DSPC (from 50/50 to 10/90 w/w) or DSPA/DSPC (from 50/50 to 20/80 w/w).
- the amount of phospholipid is generally comprised between about 0.005 and about 1.0% by weight with respect to the total weight of the emulsified mixture. Larger amounts might of course be employed but considering that the end product is an injectable contrast agent, it is preferred not to use excess of additives unless strictly necessary to provide for a stable and suitable product. In general, by using an amount of phospholipid larger than that indicated as the upper limit of the above range, essentially no or a very negligible improvement is observed in terms of bubble population, bubble size distribution, and bubble stability. Typically, higher amounts of phospholipid are required when higher volumes of organic solvent are used.
- an amount of about 1% w/w of phospholipid can advantageously be added to the emulsion.
- the amount of phospholipid is comprised between 0.01 and 1.0% by weight with respect to the total weight of the emulsified mixture and more preferably between about 0.05% and 0.5% by weight.
- the microbubbles produced according to the process of the invention are stabilized predominantly by a phospholipid, as above defined.
- the envelope surrounding the gas filled microbubbles is formed by more than 50% (w/w), preferably by at least 80%, and much more preferably by at least 90% of a phospholipid material as above defined.
- the substantial totality of the stabilizing envelope of the microbubbles is formed by a phospholipid.
- amphiphilic materials can however be admixed with the phospholipids forming the stabilizing envelope of the gas-filled microbubbles, in amounts of less than 50% of the total weight of the emulsifying composition.
- Suitable additional envelope-stabilizing amphiphilic materials include, for instance, lysolipids; fatty acids, such as palmitic acid, stearic acid, lauric acid, myristic acid, arachidic acid, arachidonic acid, behenic acid, oleic acid, linoleic acid or linolenic acid, and their respective salts with alkali or alkali metals; lipids bearing polymers, such as chitin, hyaluronic acid, polyvinylpyrrolidone or polyethylene glycol (PEG), also referred as "pegylated lipids"; lipids bearing sulfonated mono- di-, oligo- or polysaccharides; lipids with ether or ester-linked fatty acids; polymerized lipids; diacetyl phosphate; dicetyl phosphate; stearylamine; ceramides; polyoxyethylene fatty acid esters (such as polyoxyethylene fatty acid
- Small amounts of fatty acids and lyso forms of the phospholipids may also form as degradation products of the original phospholipid products, e.g. as a consequence of heating the emulsion.
- Preferred additional envelope-stabilizing amphiphilic materials are those compounds comprising one or two fatty acid residues in their molecule, in particular one or two linear (C 10 -C 20 )-acyl, preferably (C ⁇ 4 -C 18 )-acyl chains, such as, for instance, the above listed fatty acids, their respective salts and derivatives.
- Particularly preferred additional envelope-stabilizing amphiphilic materials are those compounds capable of conferring an overall net charge to the stabilizing envelope, i.e. compounds bearing an overall positive or negative net charge.
- suitable negatively of positively charged compounds are, for instance, lyso-phospholipids, i.e. the lyso- form of the above cited phospholipids, such as lysophosphatidylserine derivatives (e.g. lyso-DMPS, - DPPS or -DSPS), lysophosphatidic acid derivatives (e.g. lyso-DMPA, -DPPA or - DSPA) and lysophosphatidylglycerol derivatives (e.g.
- chlorine or bromine comprising at least one (C 10 -C 20 ) alkyl chain, preferably (C 14 -C 18 ) alkyl chain, such as, for instance stearylammonium chloride, hexadecylammonium chloride, dimethyldioctadecylammonium bromide (DDAB), hexadecyltrimethylammonium bromide (CTAB); tertiary or quaternary ammonium salts with a halogen counter ion (e.g.
- contrast agents containing microbubbles that could selectively bind to a specific site after in vitro or in vivo administration, according to the process of the present invention it is also possible to start directly from a phospholipid at least part of which has been modified by the introduction of a suitably selected targeting ligand or alternatively, and preferably, starting from phospholipid at least part of which contain a possibly protected reactive group capable of being coupled at a later stage with the suitably selected targeting ligand containing a complementary reactive function (e.g. avidin-biotin link).
- the term "phospholipid” is intended to encompass both modified and unmodified phospholipids, thus including phospholipids modified by linking a targeting ligand or a protective reactive group to the amphiphilic molecule of the phospholipid.
- targeting ligand includes within its meaning any compound, moiety or residue having, or being capable to promote, a targeting activity of the microbubbles of the invention towards any biological or pathological site within a living body.
- Materials or substances which may serve as targeting ligands include, for example, but are not limited to proteins, including antibodies, antibody fragments, receptor molecules, receptor binding molecules, glycoproteins and lectins; peptides, including oligopeptides and polypeptides; peptidomimetics; saccharides, including mono and polysaccharides; vitamins; steroids, steroid analogs, hormones, cofactors, bioactive agents and genetic material, including nucleosides, nucleotides and polynucleotides.
- targeting ligands examples include Suitable targets and targeting ligands, for instance, in US patent no. 6,139,819, which is herein incorporated by reference.
- the targeting ligands can be bound to the amphiphilic molecules forming the stabilizing envelope through a covalent bond.
- the specific reactive moiety that needs to be present in the phospholipid or lipid molecule when a targeting amphiphilic molecule is desired will depend on the particular targeting ligand to be coupled thereto.
- suitable reactive moieties for the amphiphilic molecule may be isothiocyanate groups (that will form a thiourea bond), reactive esters (to form an amide bond), aldehyde groups (for the formation of an imine bond to be reduced to an alkylamine bond), etc.;
- suitable complementary reactive moieties for the amphiphilic molecule include haloacetyl derivatives or maleimides (to form a thioether bond); and if the targeting ligand can be linked to the amphiphilic molecule through a carboxylic group, suitable reactive moieties for the
- the starting phospholipid will contain a suitable reactive moiety and the targeting ligand containing the complementary functionality will be linked thereto either at any step before the lyophilization, by adding the targeting ligand containing the complementary functionality into the phase containing the functionalised phospholipids/lipids, either before, during or after the generation of the emulsion, or just before the reconstitution step.
- the targeting ligand containing the complementary functionality into the phase containing the functionalised phospholipids/lipids, either before, during or after the generation of the emulsion, or just before the reconstitution step.
- the microbubbles containing at least part of the film-forming phospholipids, or of the associated lipids, suitably functionalised might then be bound to any desired targeting ligand, sharing the same reactive complementary group.
- the targeting ligand needs to be bound to the amphiphilic molecules through a covalent bond.
- the targeting ligands may also be suitably associated to the microbubbles via physical and/or electrostatic types of interactions.
- a functional moiety having a high affinity and selectivity for a complementary moiety can be introduced into the phospholipid molecule, while the complementary moiety will be linked to the targeting ligand.
- an avidin (or streptavidin) moiety having high affinity for biotin
- biotin-labelled targeting ligand will thus be associated to the avidin-labelled microbubble by means of the avidin-biotin coupling system.
- a biotin-containing phospholipid can be used as a compound to form the stabilizing envelope of a microbubble; biotin-containing phospholipid incorporated in the stabilizing envelope is then reacted first with avidin (or neutravidin) and then with a biotin-containing ligand.
- biotin/avidin labelling of phospholipids and peptides are also disclosed in the above cited US 6,139,819.
- van der Waal's interactions, electrostatic interactions and other association processes may associate or bind the targeting ligand to the amphiphilic molecules.
- Suitable specific targets to which the microbubbles of the invention can be directed are, for instance, fibrin, the ⁇ v 3 receptor or the GPIIbllla receptor on activated platelets. Fibrin and platelets are in fact generally present in "thrombi", i.e. coagula which may form in the blood stream and cause a vascular obstruction.
- thrombi i.e. coagula which may form in the blood stream and cause a vascular obstruction.
- Suitable binding peptides are disclosed, for instance, in the above cited US 6,139,819. Further binding peptides specific for fibrin-targeting are disclosed, for instance, in International patent application WO 02/055544, which is herein incorporated by reference.
- KDR kinase domain region
- VEGF vascular endothelial growth factor/KDR complex
- Binding peptides suitable for KDR or VEGF/KDR complex are disclosed, for instance, in International Patent application WO 03/74005 and WO 03/084574, both herein incorporated by reference.
- the emulsifying step a) of the process of the present invention can be carried out by submitting the aqueous medium and the core solvent in the presence of at least one phospholipid to any appropriate emulsion-generating technique known in the art, such as, for instance, sonication, shaking, high pressure homogenization, micromixing, membrane emulsification, high speed stirring or high shear mixing, e.g. using a rotor-stator homogenizer.
- a rotor-stator homogenizer is employed, such as Polytron ® PT3000.
- gas-filled microbubbles having a number mean diameter of less than about 1.5 ⁇ m By increasing the agitation speed at about 12000 rpm, it is in general possible to obtain gas-filled microbubbles having a number mean diameter of less than about 1.5 ⁇ m, while with an agitation speed of about 14000-15000 rpm, gas-filled microbubbles having a number mean diameter of about 1.0 ⁇ m or less can generally be obtained. In general it has been observed that by increasing the agitation speed above about 18000 rpm, slight further reduction of microbubbles size is obtained.
- a micromixing technique can also be employed for emulsifying the mixture. As known, a micromixer typically contain at least two inlets and at least one outlet. The organic solvent is thus introduced into the mixer through a first inlet (at a flow rate of e.g.
- the organic solvent can be introduced gradually during the emulsification step or at once before starting the emulsification step.
- the aqueous medium may be gradually added to the water immiscible solvent during the emulsification step or at once before starting the emulsification step.
- the phospholipid is dispersed in the aqueous medium before this latter is admixed with the organic solvent.
- the phospholipid can be dispersed in the organic solvent or it may be separately added the aqueous-organic mixture before or during the emulsification step.
- step a) is conveniently carried out at room temperature, e.g. at a temperature of 22°C ⁇ 5°C, or at higher temperatures, for instance 50°C-60 °C (e.g. in the case of core solvents with high boiling points) or at lower temperature, for instance 0°C-10°C (e.g. in the case of core solvents with boiling points close to room temperature).
- the temperature is preferably kept below the boiling temperature of the organic solvent, preferably at least 5°C below said temperature, more preferably at least 10°C below.
- prolonged exposure of the mixture at high temperatures may cause possible degradations of phospholipids, with consequent formation of of the respective lyso-derivatives, it is in general preferred to avoid such prolonged heating at high temperatures.
- the aqueous medium containing the phospholipids can be subjected to controlled heating, in order to facilitate the dispersion thereof.
- the phospholipid containing aqueous suspension can be heated at about 60-70°C for about 15 minutes and then allowed to cool at the temperature at which the emulsion step is then carried out.
- additional amphiphilic materials such as those previously listed, can also be introduced into the emulsifying mixture containing the phospholipid.
- the amount of said additional amphiphilic compounds is preferably not higher than about 50% by weight with respect to the total weight of amphiphilic material, more preferably not higher than 20% by weight, down to an amount of e.g. about 0.1%.
- the aqueous medium may, if desired, further contain one or more excipients.
- excipient refers to any additive useful in the present invention, such as those additives employed to increase the stability of the emulsion or of the lyophilisate intermediate and/or to provide for pharmaceutically acceptable and stable final compositions.
- Exemplary excipients in this regard are, for instance, viscosity enhancers and/or solubility aids for the phospholipids.
- Viscosity enhancers and solubility aids that may suitably be employed are for example mono- or polysaccharides, such as glucose, lactose, saccharose, and dextrans, aliphatic alcohols, such as isopropyl alcohol and butyl alcohol, polyols such as glycerol, 1,2-propanediol, and the like agents.
- aliphatic alcohols such as isopropyl alcohol and butyl alcohol
- polyols such as glycerol, 1,2-propanediol, and the like agents.
- the Applicant has found substantially unnecessary, to add water-insoluble structure-builders, such as cholesterol, to the emulsifying mixture.
- water-insoluble structure-builders such as cholesterol
- an amount of 0.05% (w/w with respect to the total weight of the emulsifying mixture) of cholesterol dramatically reduces the conversion yield from microdroplets into gas-filled microvesicles, further resulting in a broad-dispersion of the vesicles' size.
- the amount of water-insoluble compounds in the emulsifying mixture is thus preferably lower than 0.050%, more preferably lower than about 0.030% by weight with respect to the total weight of the emulsion.
- Emulsions produced according to step a) may advantageously be subjected to one or more washing steps, prior to the lyophilization of step b), in order to remove excess of phospholipids in the aqueous phase (not associated to the emulsion) and separate and remove optional additives such as viscosity enhancers and solubility aids, as well as undesired material such as colloidal particles, and undersized and/or oversized emulsion droplets.
- Such washing may be effected in per se known manner, the emulsion being separated using techniques such as decantation, flotation, centrifugation, cross flow filtration and the like.
- washing steps are foreseen, and if a lyoprotective agent was present in the original aqueous phase prior to the generation of the emulsion, said washing steps can be performed with aqueous solutions containing one or more lyoprotective agents to replace the amount of lyoprotective agents partially removed with the washings.
- the formed emulsion can be washed with a lyoprotectant-containing aqueous solution, in order to introduce the lyoprotectant into the emulsified mixture or, alternatively, the lyoprotectant can be added after the washing steps, prior to lyophilisation.
- the emulsion (either as such or after the washing step) can be subjected to a ultrafiltration or microfiltration step before lyophilization, in order to further reduce the amount of large size microbubbles in the final reconstituted suspension.
- a ultrafiltration or microfiltration step before lyophilization, in order to further reduce the amount of large size microbubbles in the final reconstituted suspension.
- microfiltration e.g. with a 5 ⁇ m or 3 ⁇ m filter
- large size microdroplets are in fact retained by the filter and separated from the rest of the small size microdroplets, thus preventing the formation of large size microbubbles upon reconstitution of the lyophilized material.
- Microfiltration can be accomplished according to conventional techniques such as positive filtration, vacuum filtration or in-line filtration.
- Membranes of filtration can be Nylon, glass fiber , cellulose, paper , polycarbonate or polyester (Nuclepore ® ) membranes.
- an additional amphiphilic compound can be added after the formation of the emulsion according to the above teachings, either with or without the washing steps.
- an aqueous suspension of the desired compound is added to the formed emulsion, preferably under agitation and heating (preferably at less than 80°C, e.g. 40°C- 80°C, in particular 50-70°C), in order to add said compound to the stabilizing envelope.
- amphiphilic compounds which may otherwise negatively affect the properties of the final product if introduced in the initial mixture of the emulsion.
- amphiphilic compounds which can conveniently be subsequently introduced as additional components of the stabilizing envelope after the preparation of the initial emulsion are, for instance, PEG-modified phospholipids, in particular PEG-modified phosphatidylethanolamines, such as DMPE-PEG750, DMPE-PEG1000, DMPE- PEG2000, DMPE-PEG3000, DMPE-PEG4000, DMPE-PEG5000, DPPE-PEG750, DPPE-PEG1000, DPPE-PEG2000, DPPE-PEG3000, DPPE-PEG4000, DPPE- PEG5000, DSPE-PEG750, DSPE-PEG1000, DSPE-PEG2000, DSPE-PEG3000, DSPE-PEG4000, DSPE- PEG5000, DSPE-PEG750,
- polymeric surfactants which can be conveniently added after formation of the emulsion are, for instance, ethyleneoxide-propylenoxide block copolymers, such as Pluronic F68, Pluronic F108, Pluronic F-127 (Sigma Aldrich, Missouri, USA); Polyoxyethylated alkyl ethers such as Brij ® 78 (Sigma Aldrich, Missouri, USA); Polyoxyethylene fatty acid esters such as Myrj ® 53 or Myrj ® 59 (Sigma Aldrich, Missouri, USA); Polyoxyethylenesorbitan fatty acid ester such as Tween ® 60 (Sigma Aldrich, Missouri, USA); or Polyethylene glycol tert-octylphenyl ether such as Triton ® X-100 (Sigma Aldrich, Missouri, USA).
- Pluronic F68 Pluronic F108, Pluronic F-127
- Polyoxyethylated alkyl ethers such as Brij ® 78 (Sigma
- the Applicant has in fact observed that the use of a mixture containing limited amounts (e.g. less than 10% by weight) of a PEG modified phospholipid (e.g. DSPE-PEG or DPPE-PEG) together with a film forming phospholipid (e.g.
- a PEG modified phospholipid e.g. DSPE-PEG or DPPE-PEG
- a film forming phospholipid e.g.
- DPPS or a 50:50 mixture of DAPC/DPPS) for preparing an emulsion according to the process of the invention may determine a substantial broadening of the size distribution in the final product, with respect to the size distribution of microbubbles obtained from an emulsion containing only the film forming phospholipid.
- an emulsion containing only the film forming phospholipid is first prepared and then an aqueous suspension of the PEG modified phospholipid is subsequently added to the obtained emulsion (e.g.
- the emulsion is subjected to a controlled additional heating treatment before the lyophilization step.
- the additional heating of the emulsion is preferably performed into a sealed container.
- the heat treatment can vary from about 15 minutes to about 90 minutes, at temperatures comprised from about 60°C to about 125°C, preferably from about 80°C to about 120°C. In general, the higher the temperature, the shortest the time of the thermal treatment.
- the emulsion can optionally be kept under agitation.
- Lyophilization of the emulsion according to step b) may be carried out by initially freezing the emulsion and thereafter lyophilizing the frozen emulsion, by per se generally known methods and devices. Since the dried, lyophilized, product will normally be reconstituted by addition of a carrier liquid prior to administration, the emulsion may advantageously be filled into sealable vials prior to lyophilization so as to give vials each containing an appropriate amount, e.g. a single dosage unit, of lyophilized dried product for reconstitution into an injectable form.
- an appropriate amount e.g. a single dosage unit
- the vacuum can be removed in the lyophilizer by introducing the desired gas to form the microbubbles in the final formulation of the contrast agent. This will allow to fill the headspace of the vials with the desired gas and then seal the vials with an appropriate closure.
- the vial can be kept under vacuum and sealed, while the gas is added at a later stage, e.g. just before administration, for instance when the gas is a radioactive or a hyperpolarized gas.
- the so obtained lyophilized product in the presence of the suitable gas can thus be stably stored for several months before being reconstituted by dissolving it into an aqueous carrier liquid, to obtain a suspension of gas-filled microbubbles.
- Any biocompatible gas, gas precursor or mixture thereof may be employed to fill the above microvesicles, the gas being selected depending on the chosen modality.
- the gas may comprise, for example, air; nitrogen; oxygen; carbon dioxide; hydrogen; nitrous oxide; a noble or inert gas such as helium, argon, xenon or krypton; a radioactive gas such as Xe 133 or Kr 81 ; a hyperpolarized noble gas such as hyperpolarized helium, hyperpolarized xenon or hyperpolarized neon; a low molecular weight hydrocarbon (e.g.
- an alkane such as methane, ethane, propane, butane, isobutane, pentane or isopentane, a cycloalkane such as cyclobutane or cyclopentane, an alkene such as propene, butene or isobutene, or an alkyne such as acetylene; an ether; a ketone; an ester; halogenated gases, preferably fluorinated gases, such as or halogenated, fluorinated or perfluorinated low molecular weight hydrocarbons (e.g. containing up to 7 carbon atoms); or a mixture of any of the foregoing.
- an alkane such as methane, ethane, propane, butane, isobutane, pentane or isopentane
- a cycloalkane such as cyclobutane or cyclopentane
- an alkene such as propene, but
- Preferred compounds are perfluorinated gases, such as SF 6 or perfluorocarbons (perfluorinated hydrocarbons), i.e. hydrocarbons where all the hydrogen atoms are replaced by fluorine atoms, which are known to form particularly stable microbubble suspensions, as disclosed, for instance, in EP 0554 213, which is herein incorporated by reference.
- perfluorocarbon includes saturated, unsaturated, and cyclic perfluorocarbons.
- biocompatible, physiologically acceptable perfluorocarbons are: perfluoroalkanes, such as perfluoromethane, perfluoroethane, perfluoropropanes, perfluorobutanes (e.g.
- perfluoro-n-butane optionally in admixture with other isomers such as perfluoro-isobutane), perfluoropentanes, perfluorohexanes or perfluoroheptanes; perfluoroalkenes, such as perfluoropropene, perfluorobutenes (e.g. perfluorobut-2ene) or perfluorobutadiene; perfluoroalkynes (e.g. perfluorobut-2-yne); and perfluorocycloalkanes (e.g.
- Preferred saturated perfluorocarbons have the formula C n F n+2 , where n is from 1 to 12, preferably from 2 to 10, most preferably from 3 to 8 and even more preferably from 3 to 6.
- Suitable perfluorocarbons include, for example, CF 4 , C 2 F 5 , C 3 F 8 , C 4 F 8 , C 4 F 10 , ⁇ 5 " ⁇ 2 ' C 6 F 12 , ⁇ - w ⁇ 7 ⁇ ' ⁇ 7 F 16 , CgF 18 , and C 9 F 20 ,
- gases are SF 6 or perfluorocarbons selected from CF 4 , C 2 F 6 , C 3 F 8 , C 4 F 8 , C 4 F 10 or mixtures thereof; SF 6 , C 3 F 8 or C 4 F ⁇ 0 are particularly preferred.
- the amount of gas (B) can represent from about 0.5% to about 95% v/v of the total mixture, preferably from about 5% to 80%.
- a precursor to a gaseous substance i.e. a material that is capable of being converted to a gas in vivo.
- the gaseous precursor and the gas derived therefrom are physiologically acceptable.
- the gaseous precursor may be pH-activated, photo- activated, temperature activated, etc.
- certain perfluorocarbons may be used as temperature activated gaseous precursors. These perfluorocarbons, such as perfluoropentane or perfluorohexane, have a liquid/gas phase transition temperature above room temperature (or the temperature at which the agents are produced and/or stored) but below body temperature; thus, they undergo a liquid/gas phase transition and are converted to a gas within the human body.
- gas as used herein includes mixtures in vapor form at the normal human body temperature of 37 °C.
- Compounds which at the temperature of 37°C are liquid may thus also be used in limited amounts in admixture with other gaseous compounds, to obtain a mixture which is in a vapor phase at 37°C.
- the biocompatible gas or gas mixture is preferably selected from air, nitrogen, carbon dioxide, helium, krypton, xenon, argon, methane, halogenated hydrocarbons (including fluorinated gases such as perfluorocarbons and sulfur hexafluoride) or mixtures thereof.
- halogenated hydrocarbons including fluorinated gases such as perfluorocarbons and sulfur hexafluoride
- perfluorocarbons in particular C 4 F ⁇ 0 or C 3 F 8
- SF 6 can be used, optionally in admixture with air or nitrogen.
- the microbubbles will preferably contain a hyperpolarized noble gas such as hyperpolarized neon, hyperpolarized helium, hyperpolarized xenon, or mixtures thereof, optionally in admixture with air, CO2, oxygen, nitrogen, helium, xenon, or any of the halogenated hydrocarbons as defined above.
- a hyperpolarized noble gas such as hyperpolarized neon, hyperpolarized helium, hyperpolarized xenon, or mixtures thereof, optionally in admixture with air, CO2, oxygen, nitrogen, helium, xenon, or any of the halogenated hydrocarbons as defined above.
- the microbubbles according to the invention will preferably contain radioactive gases such as Xe 133 or Kr 81 or mixtures thereof, optionally in admixture with air, C0 2 , oxygen, nitrogen, helium, kripton or any of the halogenated hydrocarbons as defined above.
- radioactive gases such as Xe 133 or Kr 81 or mixtures thereof, optionally in admixture with air, C0 2 , oxygen, nitrogen, helium, kripton or any of the halogenated hydrocarbons as defined above.
- the lyophilized composition in contact with the gas can then be very easily reconstituted by the addition of an appropriate sterile aqueous injectable and physiologically acceptable carrier liquid such as sterile pyrogen-free water for injection, an aqueous solution such as saline (which may advantageously be balanced so that the final product for injection is not hypotonic), or an aqueous solution of one or more tonicity-adjusting substances such as salts (e.g. of plasma cations with physiologically tolerable counterions), or sugars, sugar alcohols, glycols and other non-ionic polyol materials (e.g.
- the so obtained reconstituted microbubbles have generally a number mean diameter which is slightly lower than the number mean diameter measured for the microdroplets of the emulsion.
- the mean number diameter of the microbubbles is in general from about 60% to about 90% of the mean number diameter of the emulsion's microdroplets. In most cases, a mean number diameter of the microbubbles of about 70-75% of the mean number diameter of the microdroplets has been observed.
- the dried product is contained in a vial, this is conveniently sealed with a septum through which the carrier liquid may be injected using an optionally pre-filled syringe; alternatively the dried product and carrier liquid may be supplied together in a dual chamber device such as a dual chamber syringe. It may be advantageous to mix or gently shake the product following reconstitution.
- the size of the gas microbubbles may be substantially independent of the amount of agitation energy applied to the reconstituted dried product. Accordingly no more than gentle hand-shaking may be required to give reproducible products with consistent microbubble size.
- microbubble suspensions generated upon reconstitution in water or an aqueous solution may be stable for at least 12 hours, thus permitting considerable flexibility as to when the dried product is reconstituted prior to injection.
- the lyophilised residue may be stored and transported without need of temperature control of its environment and in particular it may be supplied to hospitals and physicians for on site formulation into a ready-to-use administrable suspension without requiring such users to have special storage facilities.
- Said two component kit can include two separate containers or a dual- chamber container.
- the container is a conventional septum-sealed vial, wherein the vial containing the lyophilized residue of step b) is sealed with a septum through which the carrier liquid may be injected using an optionally prefilled syringe.
- the syringe used as the container of the second component is also used then for injecting the contrast agent.
- aqueous phase can be interposed between the water-insoluble gas and the environment, to increase shelf life of the product.
- a material necessary for forming the contrast agent is not already present in the container (e.g. a targeting ligand to be linked to the phospholipid during reconstitution)
- it can be packaged with the other components of the kit, preferably in a form or container adapted to facilitate ready combination with the other components of the kit.
- contrast agents obtainable by the process of the present invention may be used in a variety of diagnostic imaging techniques, including in particular ultrasound and Magnetic Resonance. Possible other diagnostic imaging applications include scintigraphy, light imaging, and X-ray imaging, including X- ray phase contrast imaging.
- contrast agents according to the invention may produce an increase in backscattered signal intensity from the myocardium of 15-25 dB following intravenous injection of doses as low as 0.001 ml/kg body weight. Signals may be observed at even lower doses using more sensitive techniques such as color Doppler or power pulse inversion.
- the emulsion is then centrifuged (800-1200 rpm for 10 minutes, Sigma centrifuge 3K10) to eliminate the excess of the phospholipid and the separated pellets (microdroplets) were recovered and re-suspended in the same initial volume of a 10% mannitol aqueous solution.
- the washed emulsion is then collected into a 100 ml balloon for lyophilization, frozen and then freeze-dried according to the above standard procedure.
- the lyophilized is then exposed to an atmosphere containing 35% of perfluoro-n-butane and 65% of nitrogen and then dispersed in a volume of water twice than the initial one by gentle hand shaking.
- the microbubble suspension obtained after reconstitution with distilled water is analyzed using a Coulter counter. The concentration of microbubbles in the obtained suspensions was of about lxlO 9 particles per ml.
- microbubbles median diameter in volume (D v50 ), mean diameter in volume (D v ), mean diameter in number (D N ) an the amount of microbubbles with diameter larger than 3 ⁇ m (percentage over the total number of microbubbles) are given in table 1.
- D v50 mean diameter in volume
- D v mean diameter in number
- D N mean diameter in number
- Example 11 Distilled water (30 ml) containing 60 mg of DPPS and 3g of mannitol is heated to 70°C during 15 minutes then cooled to room temperature.
- Perfluoroheptane is emulsified in this aqueous phase using a high speed homogenizer (Polytron ® , 12500rpm, 1 minute).
- the first portion (A) is used as such for the subsequent lyophilization step.
- the second portion (B) is collected into a syringe and hand-injected through a 5 ⁇ m Nuclepore ® filter (47mm - Polycarbonate).
- the third portion (C) is filtered through a 3 ⁇ m Nuclepore ® filter (47mm - Polycarbonate) with the same method.
- the emulsions were frozen in 100ml balloon (-45°C for 5 minutes) then freeze dried (0.2 mBar, for 72 hours). Atmospheric pressure is restored by introducing a 35/65 mixture of C 4 F 10 and air. The respective lyophilisates were dispersed in distilled water (10ml). The so obtained microbubbles suspensions are analysed using a Coulter counter and the results are reported in the following table
- Part A 1.71 1.12 1.53 Part B 1.65 1.12 1.47
- the additional filtration step allows to further reduce the dimension of the microbubbles and to reduce the respective size distribution.
- Example 1 has been repeated, by using 10 mg of a 7/3 (w/w) mixture of
- example 13a The preparation of example 1 is repeated, by emulsifying the mixture at a speed of 10000 rpm (example 13a).
- Table 10 shows the characterization of the two preparations, both of the emulsion and of the microbubbles suspension.
- example 11 The preparation of example 11 is repeated, by replacing DPPS with the same amount of a 1 : 1 (w/w) mixture of DAPC/DPPS.
- the resulting emulsion is divided in three portions of 10 ml, without washing it by centrifugation.
- Aqueous suspensions of DSPE-PEG2000 and of DSPE-PEG5000 are separately prepared by dispersing 25 mg of the respective DSPE-PEG in 5 ml of a 10% mannitol solution under sonication (3mm sonication probe, Branson 250 sonifier, output 30%, for 5 min).
- the three mixtures are heated at 60°C under stirring for one hour. After cooling at room temperature, the size of microdroplets are determined by means of Malvern Mastersizer. Results are reported in table 11.
- the emulsions are then freeze dried according to the procedure of example 11. Atmospheric pressure is restored by introducing a 35/65 mixture of C 4 F 10 and air. The respective lyophilisates were dispersed in distilled water (10ml). The so obtained microbubbles suspensions were analysed using a Coulter counter (see table 11).
- Microbubble suspensions are then washed twice with distilled water by centrifugation (180g/10 min) and lyophilized again according to the above procedure.
- the amount of DSPE-PEG in the dried composition is determined by means of HPLC-MS. Results are given in the following table 11. Table 11
- the subsequent addition of a DSPE-PEG suspension to the formed emulsion allows introducing relatively high amounts of DSPE-PEG in the composition of the stabilizing layer (in this case more than 30% of the total weight of the phospholipids forming the stabilizing envelope), without negatively affecting the final properties of the microbubbles.
- PEG-modified phospholipids in particular DSPE-PEG2000-Biotin or DSPE-PEG2000-Maleimide
- peptide bearing phospholipids in particular DSPE-PEG2000-maleimide-SATA-RGD4C.
- This latter peptide bearing phospholipid can be prepared according to known techniques, by reacting the RGD-4C peptide with SATA, deprotecting the thiol group of SATA and reacting the deprotected RGD4C-SATA with DSPE-PEG2000- maleimide.
- the mixture is heated at 70°C for 15 minutes and then cooled at room temperature (22°C).
- Cyclooctane is added at a flow rate 0.2 mL/min through an inlet of a micromixer (standard slit Interdigidital micro Mixer, housing SS 316Ti with nickel-on-copper inlay, 40 ⁇ m x 300 ⁇ m, Institut fur Microtechnik Mainz GmbH) to the aqueous phase circulating at 20 ml/min at room temperature, for a total amount of 7.4% (v/v) of organic solvent.
- the emulsion is recirculated in the micromixer for additional 20 minutes.
- the emulsion is then divided into five aliquots of 2 ml each and it is introduced into five vials DIN8R. Four vials are sealed and heated for 30 minutes at temperatures of 60, 80, 100 and 120°C, respectively, as indicated in table 12, while the fifth is not heated.
- the emulsions are then cooled to room temperature and the content of the five vials is subjected to lyophilization according to the following procedure. 1 ml of each emulsion is collected into a DIN8R vial and frozen at -5°C; the temperature is lowered to -45°C during 1 hour and the emulsion is then freeze- dried at -25°C and 0.2 mbar during 12 hours (Telstar Lyobeta35 lyophilizer), with a final drying step at 30°C and 0.2 mbar for 5 hours.
- the lyophilized product is then exposed to an atmosphere containing 35% of perfluoro-n-butane and 65% of nitrogen and then dispersed in a volume of water twice than the initial one by gentle hand shaking.
- Table 12 shows the result of the characterization of the final suspension of microbubbles.
- Example 16 Distilled water (10 ml) containing 10 mg of DPPS and 1 g of mannitol is heated to 70°C during 15 minutes then cooled to room temperature.
- DPPE- MPB (l,2-Dipalmitoyl-sn-glycero-3-phosphoethanolamine-N-[4-(p- maleimidophenyl) butyramide] Na salt - Avanti Polar Lipids) is added (4.8% by weight - 0.5mg). This phospholipid is dispersed in the aqueous phase using a ultrasound bath (Branson 1210 - 3 minutes).
- Perfluoroheptane (0.8 ml from Fluka) is emulsified in this aqueous phase (cooled with a ice bath) using a high speed homogenizer (Polytron ® T3000, 15000rpm, 1 minute).
- the resulting emulsion showed a median diameter in volume (D V so) of 2.3 ⁇ m and a mean diameter in number (D N ) of 2.1 ⁇ m as determined with a Malvern Mastersizer.
- the emulsion is washed twice by centrifugation then resuspended in 9.5 ml of a 10% solution of mannitol in distilled water.
- the washed emulsion is frozen (-45°C , 5 minutes) then freeze dried (under 0.2 mBar, for 24 hours). Atmospheric pressure is restored by introducing a 35/65 mixture of C 4 F 10 and air.
- the lyophilisate is dispersed in distilled water (20 ml), microbubbles were washed once by centrifugation and then redispersed in 4ml of an EDTA containing phosphate buffered saline (molar composition: 10 mM phosphate, 2.7 mM KCI, 137 mM NaCI, 10 mM EDTA), containing 3.4 mg of thioacetylated avidin, 400 ⁇ l of a hydroxylamine solution (13.92 mg in PBS 50 mM, pH: 7.5) were added to deprotect the thiol group of the thioacetylated avidin. The suspension is stirred by inversion on a disk rotator (Fisher Scientific) for 2 hours. Then 150 ⁇ l of NaOH IN were added.
- the so obtained avidin-labelled microbubbles were washed twice with PBS by centrifugation (10000 rpm, 10 minutes, Sigma centrifuge 3K10).
- the microbubbles suspension obtained is analysed using a Coulter counter showing a D V5 o diameter of 1.6 ⁇ m and a D N of 1.2 ⁇ m.
- Echo imaging is performed with an HDI 5000 ultrasound machine (Philips), pulse inversion mode, L7-4 probe, MI: 0.07.
- a biotinylated antibody (CD41 specific for the GPIIB/IIIA receptor of activated platelets) is then injected intravenously to the two rabbit.
Abstract
Description
Claims
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EP04707586A EP1590006B1 (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and process for the preparation thereof |
US10/544,123 US9364569B2 (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and process for the preparation thereof |
JP2006502384A JP4670083B2 (en) | 2003-02-04 | 2004-02-03 | Ultrasonic contrast agent and method for producing the same |
DK04707586.6T DK1590006T3 (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and methods for producing them |
DE602004029010T DE602004029010D1 (en) | 2003-02-04 | 2004-02-03 | ULTRASONIC CONTRASTING AGENT AND METHOD OF CREATION |
AU2004210221A AU2004210221B2 (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and process for the preparation thereof |
CA2512454A CA2512454C (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and process for the preparation thereof |
AT04707586T ATE480263T1 (en) | 2003-02-04 | 2004-02-03 | ULTRASONIC CONTRAST AGENTS AND METHOD FOR CREATION |
MXPA05007730A MXPA05007730A (en) | 2003-02-04 | 2004-02-03 | Ultrasound contrast agents and process for the preparation thereof. |
IL169677A IL169677A (en) | 2003-02-04 | 2005-07-14 | Processes for the preparation of ultrasound contrast agents |
US11/202,008 US20060034770A1 (en) | 2003-02-04 | 2005-08-11 | Ultrasound contrast agents and process for the preparation thereof |
NO20054089A NO331966B1 (en) | 2003-02-04 | 2005-09-02 | Processes for the preparation of ultrasonic contrast agents |
US11/641,289 US20070128117A1 (en) | 2003-02-04 | 2006-12-19 | Ultrasound contrast agents and process for the preparation thereof |
US13/039,838 US20110236320A1 (en) | 2003-02-04 | 2011-03-03 | Ultrasound Contrast Agents And Process For The Preparation Thereof |
US13/710,189 US20130101522A1 (en) | 2003-02-04 | 2012-12-10 | Ultrasound Contrast Agents And Process For The Preparation Thereof |
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DE602004029010D1 (en) | 2010-10-21 |
EP1590006A2 (en) | 2005-11-02 |
US9364569B2 (en) | 2016-06-14 |
MXPA05007730A (en) | 2006-01-31 |
ES2352087T3 (en) | 2011-02-15 |
AU2004210221B2 (en) | 2008-11-20 |
KR20050096959A (en) | 2005-10-06 |
CN100374165C (en) | 2008-03-12 |
US20130101522A1 (en) | 2013-04-25 |
CA2512454A1 (en) | 2004-08-19 |
US20060051297A1 (en) | 2006-03-09 |
NO20054089L (en) | 2005-10-05 |
DK1590006T3 (en) | 2010-12-20 |
CN1744921A (en) | 2006-03-08 |
US20060034770A1 (en) | 2006-02-16 |
JP4670083B2 (en) | 2011-04-13 |
NO331966B1 (en) | 2012-05-14 |
JP2006520754A (en) | 2006-09-14 |
NO20054089D0 (en) | 2005-09-02 |
US20110236320A1 (en) | 2011-09-29 |
WO2004069284A3 (en) | 2004-11-25 |
ATE480263T1 (en) | 2010-09-15 |
IL169677A (en) | 2011-07-31 |
EP1590006B1 (en) | 2010-09-08 |
CA2512454C (en) | 2012-10-30 |
KR101076053B1 (en) | 2011-10-21 |
AU2004210221A1 (en) | 2004-08-19 |
RU2345793C2 (en) | 2009-02-10 |
RU2005127634A (en) | 2006-01-20 |
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