Methods for removing interferences due to endogenous...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/32 (2006.01)

Patent

CA 2236307

The present invention is an improvement in a method using a reporter dehydrogenase for detecting the presence of an analyte in a sample in which endogenous dehydrogenases present in the sample interfere with the detection of the analyte. The improvement is the inclusion of an inhibitor of the endogenous dehydrogenase in the assay medium. The improvement finds particular utility in the measurement of ethyl alcohol using alcohol dehydrogenase as the reporter enzyme when lactate and lactate dehydrogenase present in the sample interfere with the detection of the analyte. Particularly effective inhibitors which prevent this interference are fatty acids, such as, agaric acid and lauric acid, and alkyl sulfate salts, such as, sodium dodecyl sulfate and sodium decyl sulfate.

La présente invention porte sur une amélioration destinée à un procédé d'utilisation d'une déshydrogénase reporter pour détecter la présence d'un analyte dans un échantillon dans lequel la présence de déshydrogénases endogènes gêne cette détection. L'amélioration consiste à inclure un inhibiteur de la déshydrogénase endogène dans le milieu de dosage, et elle trouve une application particulière dans la mesure d'alcool éthylique à l'aide de l'alcool-déshydrogénase en tant qu'enzyme reporter, lorsqu'un lactate et la lactate-déshydrogénase présents dans l'échantillon gênent la détection de l'analyte. Des inhibiteurs particulièrement efficaces et empêchant cette interférence sont constitués par des acides gras, tels que l'acide agarique et l'acide laurique, des sels de sulfate d'alkyle tels que du dodécylsulfate de sodium et du décylsulfate de sodium.

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