The invention includes various prototypical amperometric biosensors for the quantification of biological substrates such as fructose, creatinine, creatine, and sarcosine, and the methods for producing these biosensors. Also included in the invention is a minaturized version of the biosensing devices....http://www.google.es/patents/US6241863?utm_source=gb-gplus-sharePatente US6241863 - Amperometric biosensors based on redox enzymes