Small volume in vitro analyte sensor with diffusible or...

C - Chemistry – Metallurgy – 12 – Q

Patent

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Details

C12Q 1/54 (2006.01) C12M 1/40 (2006.01) C12Q 1/00 (2006.01) G01N 27/403 (2006.01) G01N 27/416 (2006.01) G01N 33/50 (2006.01)

Patent

CA 2346415

A sensor utilizing a non-leachable or diffusible redox mediator is described. The sensor includes a sample chamber to hold a sample in electrolytic contact with a working electrode, and in at least some instances, the sensor also contains a non-leachable or a diffusible second electron transfer agent. The sensor and/or the methods used produce a sensor signal in response to the analyte that can be distinguished from a background signal caused by the mediator. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is typically provided as a second electron transfer agent.

L'invention se rapporte à un détecteur utilisant un médiateur d'oxydo-réduction non lixiviable ou diffusible. Ce détecteur comporte une chambre à échantillons conçue pour loger un échantillon en contact électrolytique avec une électrode de travail, et dans certains cas au moins, ce détecteur contient un second agent de transfert d'électrons non lixiviable ou diffusible. Le détecteur et/ou les procédés de cette invention permettent la génération d'un signal qui est fonction de l'analyte et qui peut être distingué d'un signal de fond provoqué par le médiateur. Cette invention peut servir à la détermination de la concentration d'une biomolécule, telle que le glucose ou le lactate, dans un fluide biologique, tel que du sang ou du sérum, au moyen de techniques telles que la colorimétrie, l'ampérométrie et la potentiométrie. Le second agent de transfert d'électrons est généralement un enzyme susceptible de catalyser l'électro-oxydation ou l'électro-réduction de la biomolécule.

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