Biosensor incorporating a surfactant

G - Physics – 01 – N

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G01N 27/327 (2006.01) C12Q 1/00 (2006.01)

Patent

CA 2271149

A biosensor for the determination of a selected analyte in a sample comprises an enzyme layer incorporating an enzyme which is capable of interacting with said analyte to provide a detectable change, detecting means on one side of said layer for detecting said change, and an outer diffusion limiting barrier membrane which is provided on the opposite side of said layer to the detecting means. The membrane incorporates a surfactant so as to render it permeable to said analyte and the enzyme layer incorporates at least one substance essential to enzyme activity (e.g. a co-factor). The nature and amount of the surfactant are such that the membrane inhibits release of the substance essential to enzyme activity into the sample whilst retaining permeability to the analyte.

La présente invention a trait à un biocapteur prévu pour détecter la présence d'un analyte choisi dans un échantillon et qui se compose d'une couche enzymatique comprenant une enzyme capable d'interaction avec ledit analyte pour engendrer un changement détectable, un dispositif de détection se trouvant sur une des surfaces de ladite couche pour détecter ledit changement, et une membrane barrière limitant une diffusion extérieure se situant sur la surface opposée de ladite couche. La membrane contient un tensioactif qui la rend perméable audit analyte. Quant à la couche enzymatique, elle contient au moins une substance indispensable à l'activité de l'enzyme (par exemple un cofacteur). La nature et la quantité du tensioactif sont telles que la membrane inhibe la libération de la substance indispensable à l'activité de l'enzyme dans un échantillon tout en conservant la perméabilité à l'analyte.

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