CA2474684A1 - Faims apparatus and method using carrier gases that contain a trace amount of a dopant species - Google Patents

Faims apparatus and method using carrier gases that contain a trace amount of a dopant species Download PDF

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Publication number
CA2474684A1
CA2474684A1 CA002474684A CA2474684A CA2474684A1 CA 2474684 A1 CA2474684 A1 CA 2474684A1 CA 002474684 A CA002474684 A CA 002474684A CA 2474684 A CA2474684 A CA 2474684A CA 2474684 A1 CA2474684 A1 CA 2474684A1
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Canada
Prior art keywords
gas
carrier gas
flow
dopant
analyzer region
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Granted
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CA002474684A
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French (fr)
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CA2474684C (en
Inventor
Roger Guevremont
Randy W. Purves
David Barnett
Barbara Ells
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Thermo Finnigan LLC
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/622—Ion mobility spectrometry
    • G01N27/624—Differential mobility spectrometry [DMS]; Field asymmetric-waveform ion mobility spectrometry [FAIMS]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/65—Raman scattering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/10—Composition for standardization, calibration, simulation, stabilization, preparation or preservation; processes of use in preparation for chemical testing
    • Y10T436/105831—Protein or peptide standard or control [e.g., hemoglobin, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T436/00—Chemistry: analytical and immunological testing
    • Y10T436/24—Nuclear magnetic resonance, electron spin resonance or other spin effects or mass spectrometry

Abstract

Disclosed is a method and apparatus for improving at least one of a peak separation and a signal intensity relating to an ion of interest being transmitted through an analyzer region of a FAIMS apparatus (70). A method according to the instant invention includes a step of introducing ions including an ion of interest into an analyzer region of a FAIMS. A flow of a doped carrier gas other than air is also provided through the analyzer region.
The doped carrier gas includes a carrier gas and a trace amount of a predetermined dopant gas, the predetermined dopant gas selected for improving at least one of a peak separation and a signal intensity relating to the ion of interest relative to the peak separation and the signal intensity relating to the ion of interest in the presence of the carrier gas only. The ion of interest is selectively transmitted through the analyzer region in the presence of the doped carrier gas, and detected at a detector (74).

Claims (38)

1. An apparatus for selectively transmitting ions comprising:
a high field asymmetric waveform ion mobility spectrometer comprising two electrodes defining an analyzer region therebetween, the two electrodes disposed in a spaced apart arrangement for allowing ions to propagate therebetween and for providing an electric field within the analyzer region resulting from the application of an asymmetric waveform voltage to at least one of the two electrodes and from the application of a compensation voltage to at least one of the two electrodes, for selectively transmitting an ion of interest at a given combination of asymmetric waveform voltage and compensation voltage; and, a doping portion for receiving a flow of a carrier gas from a gas source and for controllably mixing a dopant gas with the flow of a carrier gas to produce a doped carrier gas stream containing a predetermined concentration of the dopant gas, the doping portion also in fluid communication with the analyzer region for providing the doped carrier gas stream thereto, wherein during use the doped carrier gas stream that is provided to the analyzer region contains less than 1% dopant gas by volume.
2. An apparatus according to claim 1, comprising a source of a dopant gas in fluid communication with the doping portion.
3. An apparatus according to claim 2, wherein the source of a dopant gas comprises a containing portion for containing a first gas mixture including up to approximately 1% dopant gas by volume.
4. An apparatus according to claim 2, wherein the source of a dopant gas comprises a containing portion for containing a first gas mixture including up to approximately 2500 ppm dopant gas.
5. ~An apparatus according to any one of claims 3 and 4, wherein the doping portion is in fluid communication with a second gas source for providing a second separate flow of a carrier gas that, during use, is controllably mixed with the doped carrier gas flow prior to the doped carrier gas flow being introduced into the analyzer region, to provide a diluted doped carrier gas flow for introduction into the analyzer region.
6. ~An apparatus for selectively transmitting ions comprising:
a high field asymmetric waveform ion mobility spectrometer comprising two electrodes defining an analyzer region therebetween, the two electrodes disposed in a spaced apart arrangement for allowing ions to propagate therebetween and for providing an electric field within the analyzer region resulting from the application of an asymmetric waveform voltage to at least one of the two electrodes and from the application of a compensation voltage to at least one of the two electrodes, for selectively transmitting an ion of interest at a given combination of asymmetric waveform voltage and compensation voltage;
a carrier gas source for providing a flow of a carrier gas;
a first containing portion for containing a first gas mixture including a first concentration of a dopant gas;
a second containing portion for containing a second gas mixture including a second concentration of the dopant gas; and, a doping portion in fluid communication with the carrier gas source, the first containing portion, the second containing portion and the analyzer region, for receiving the flow of a carrier gas from the gas source and for controllably mixing at least one of the first gas mixture and the second gas mixture with the flow of the carrier gas, to form a doped carrier gas stream containing a predetermined concentration of the dopant gas, and for providing the doped carrier gas stream to the analyzer region, wherein during use the doped carrier gas stream that is provided to the analyzer region contains less than 1% dopant gas by volume.
7. An apparatus according to claim 6, wherein, during use, the first containing portion contains a first gas mixture including up to approximately 1% dopant gas by volume.
8. An apparatus according to any one of claims 6 and 7, wherein, during use, the second containing portion contains a second gas mixture including between 0%
dopant gas by volume and 1% dopant gas by volume.
9. An apparatus according to any one of claims 6, 7 and 8, wherein the doping portion comprises a flow selector for selectively mixing one or the other of the first gas mixture and the second gas mixture with the flow of a carrier gas.
10. An apparatus according to any one of claims 6, 7 and 8, wherein the doping portion comprises a flow combiner for mixing a controlled amount of the first gas mixture and a controlled amount of the second gas mixture with the flow of a carrier gas.
11. A method of selectively transmitting ions, comprising the steps of:
introducing ions including an ion of interest into an analyzer region of a high field asymmetric waveform ion mobility spectrometer;
providing a flow of a doped carrier gas other than air through the analyzer region, the doped carrier gas including a carrier gas and a trace amount of a predetermined dopant gas, the predetermined dopant gas selected for improving at least one of a peals separation and a signal intensity relating to the ion of interest relative to the peak separation and the signal intensity relating to the ion of interest in the presence of the carrier gas only; and, selectively transmitting the ion of interest through the analyzer region in the presence of the doped carrier gas.
12. A method according to claim 11, wherein the predetermined dopant gas is water vapour.
13. A method according to claim 11, wherein the predetermined dopant gas is a vapour produced from an inorganic compound other than water.
14. A method according to claim 11, wherein the predetermined dopant gas is a vapour produced from an organic compound.
15. A method according to claim 14, wherein the organic compound is a halogenated compound.
16. A method according to claim 11, wherein the flow of a doped carrier gas comprises between 1 ppm and 10,000 ppm of the predetermined dopant gas.
17. A method according to claim 16 wherein the flow of a doped carrier gas comprises between 25 ppm and 1,000 ppm of the predetermined dopamt gas.
18. A method according to any one of claims 11, 12, 13, 14, 15, 16 and 17, comprising the step of providing a flow of a second doped carrier gas through the analyzer region, the second doped carrier gas including a carrier gas and a trace amount of a second predetermined dopant gas, the second predetermined dopant gas selected for improving the other one of the at least one of a peak separation and a signal intensity relating to the ion of interest relative to the peak separation and the signal intensity relating to the ion of interest in the presence of the carrier gas only.
19. A method according to any one of claims 11, 12, 13, 14, 15, 16 and 17, comprising the step of varying the trace amount of the predetermined dopant gas to determine an optimal trace amount of the predetermined dopant gas for improving the at least one of a peak separation and a signal intensity relating to the ion of interest.
20. A method of selectively transmitting ions, comprising the steps of:
providing an analyzer region defined by a space between two spaced-apart electrodes;

providing an electric field within the analyzer region resulting from the application of an asymmetric waveform voltage to at least one of the two electrodes and from the application of a direct-current compensation voltage to at least one of the two electrodes;
providing a flow of a carrier gas from a carver gas source;
removing water vapour from the flow of a carrier gas to provide a flow of a dried carrier gas;
adding a trace amount of a predetermined dopant gas to the flow of a dried carrier gas to provide a flow of a doped carrier gas;
introducing the flow of a doped carrier gas into the analyzer region;
introducing ions including an ion of interest into the analyzer region; and, selectively transmitting the ion of interest through the analyzer region in the presence of the doped carrier gas.
21. A method according to claim 20, comprising the steps of:
varying the applied compensation voltage to selectively transmit the ions of interest through the analyzer region in the presence of the flow of a dried carrier gas so as to obtain a first compensation voltage spectrum;
obtaining a plurality of other compensation voltage spectra, each compensation voltage spectrum of the plurality of other compensation voltage spectra obtained by varying the applied compensation voltage to selectively transmit the ions of interest through the analyzer region in the presence of one of a plurality of a different dopant gases; and, selecting as the predetermined dopant gas one of the dopant gases of the plurality of different dopant gases on the basis of a difference between the compensation voltage spectrum obtained using the one of the dopant gases and the first compensation voltage spectrum.
22. A method according to any one of claims 20 and 21, wherein the predetermined dopant gas is water vapour.
23. A method according to any one of claims 20 and 21, wherein the predetermined dopant gas is a vapour produced from an inorganic compound other than water.
24. A method according to any one of claims 20 and 21, wherein the predetermined dopant gas is a vapour, produced from an organic compound.
25. A method according to claim 24, wherein the organic compound is a halogenated species.
26. A method according to any one of claims 20, 21, 22, 23, 24 and 25, wherein the flow of a doped carrier gas comprises between 1 ppm and 10,000 ppm of the predetermined dopant gas.
27. A method according to any one of claims 20, 21, 22, 23, 24, 25 and 26, wherein the flow of a doped carrier gas comprises between 25 ppm and 1,000 ppm of the predetermined dopant gas.
28. A method according to any one of claims 20, 21, 22, 23, 24, 25, 26 and 27 comprising the step of varying the trace amount of the predetermined dopant gas to determine an optimal trace amount of the predetermined dopant gas in the flow of a doped carrier gas.
29. A method of selectively transmitting ions, comprising the steps of:
providing an analyzer region defined by a space between two spaced-apart electrodes;
providing an electric field within the analyzer region resulting from the application of an asymmetric waveform voltage to at least one of the two electrodes and from the application of a direct-current compensation voltage to at least one of the two electrodes;
determining a suitable dopant gas for improving one of a peak separation and a signal intensity relating to an ion of interest;

providing a flow of a carrier gas other than air through the analyzer region, the carrier gas including a first gas and a trace amount of the suitable dopant gas;
introducing ions including the ion of interest into the analyzer region; and, selectively transmitting the ion of interest through the analyzer region.
30. A method according to claim 29, wherein the step of determining a suitable dopant gas includes a step of determining an optimal amount of the suitable dopant gas for improving the one of a peak separation and a signal intensity relating to the ion of interest.
31. A method according to any one of claims 29 and 30, comprising the step of determining a suitable second dopant gas for improving the other one of a peak separation and a signal intensity relating to the ion of interest.
32. A method according to claim 31, wherein the step of determining a suitable second dopant gas includes a step of determining an optimal amount of the suitable second dopant gas for improving the other one of a peak separation and a signal intensity relating to the ion of interest.
33. A method according to any one of claims 31 and 32, wherein one of the suitable dopant gas and the suitable second dopant gas is water vapour.
34. A method according to any one of claims 31, 32 and 33, wherein at least one of the suitable dopant gas and the suitable second dopant gas is a vapour produced from an inorganic compound other than water.
35. A method according to any one of claims 31, 32 and 33, wherein at least one of the suitable dopant gas and the suitable second dopant gas is a vapour produced from an organic compound.
36. A method according to claim 35, wherein the organic compound is a halogenated species.
37. A method according to any one of claims 29, 30, 31, 32, 33, 34, 35 and 36, wherein the flow of a carrier gas comprises between 1 ppm and 10,000 ppm of the suitable dopant gas.
38. A method according to any one of claims 29, 30, 31, 32, 33, 34, 35, 36 and 37, wherein the flow of a doped carrier gas comprises between 25 ppm and 1,000 ppm of the suitable dopant gas.
CA2474684A 2002-02-08 2003-02-07 Faims apparatus and method using carrier gases that contain a trace amount of a dopant species Expired - Fee Related CA2474684C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US35471102P 2002-02-08 2002-02-08
US60/354,711 2002-02-08
PCT/CA2003/000171 WO2003067237A2 (en) 2002-02-08 2003-02-07 Faims apparatus and method using carrier gases that contain a trace amount of a dopant species

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CA2474684A1 true CA2474684A1 (en) 2003-08-14
CA2474684C CA2474684C (en) 2010-09-28

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Family Applications (8)

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CA002475608A Abandoned CA2475608A1 (en) 2002-02-08 2003-01-09 Faims with non-destructive detection of selectively transmitted ions
CA002475555A Abandoned CA2475555A1 (en) 2002-02-08 2003-02-07 Segmented side-to-side faims
CA2474586A Expired - Fee Related CA2474586C (en) 2002-02-08 2003-02-07 Method and apparatus for desolvating ions for introduction into a faims analyzer region
CA002474561A Abandoned CA2474561A1 (en) 2002-02-08 2003-02-07 Faims apparatus and method for detecting trace amounts of a vapour in a carrier gas
CA2474564A Expired - Fee Related CA2474564C (en) 2002-02-08 2003-02-07 Side-to-side faims apparatus having an analyzer region with non-uniform spacing and method therefore
CA002474584A Abandoned CA2474584A1 (en) 2002-02-08 2003-02-07 Faims apparatus having plural ion inlets and method therefore
CA002474566A Abandoned CA2474566A1 (en) 2002-02-08 2003-02-07 Method for distinguishing between protein variants
CA2474684A Expired - Fee Related CA2474684C (en) 2002-02-08 2003-02-07 Faims apparatus and method using carrier gases that contain a trace amount of a dopant species

Family Applications Before (7)

Application Number Title Priority Date Filing Date
CA002475608A Abandoned CA2475608A1 (en) 2002-02-08 2003-01-09 Faims with non-destructive detection of selectively transmitted ions
CA002475555A Abandoned CA2475555A1 (en) 2002-02-08 2003-02-07 Segmented side-to-side faims
CA2474586A Expired - Fee Related CA2474586C (en) 2002-02-08 2003-02-07 Method and apparatus for desolvating ions for introduction into a faims analyzer region
CA002474561A Abandoned CA2474561A1 (en) 2002-02-08 2003-02-07 Faims apparatus and method for detecting trace amounts of a vapour in a carrier gas
CA2474564A Expired - Fee Related CA2474564C (en) 2002-02-08 2003-02-07 Side-to-side faims apparatus having an analyzer region with non-uniform spacing and method therefore
CA002474584A Abandoned CA2474584A1 (en) 2002-02-08 2003-02-07 Faims apparatus having plural ion inlets and method therefore
CA002474566A Abandoned CA2474566A1 (en) 2002-02-08 2003-02-07 Method for distinguishing between protein variants

Country Status (5)

Country Link
US (7) US6917036B2 (en)
EP (5) EP1481240A1 (en)
AU (8) AU2003201232A1 (en)
CA (8) CA2475608A1 (en)
WO (8) WO2003067244A2 (en)

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