A new pyruvate oxidase biosensor based on 3-mercaptopropionic acid/6-aminocaproic acid modified gold electrode

Abstract

In the biosensor construction, 3-mercaptopropionic acid (3-MPA) and 6-aminocaproic acid (6-ACA) were used for forming self-assembled monolayer (SAM) on a gold disc electrode and pyruvate oxidase was immobilized on the modified electrode surface by using glutaraldehyde. Biosensor response is linearly related to pyruvate concentration at 2.5-50 μM, detection limit is 1.87 μM and response time of the biosensor is 6 s for differential pulse voltammograms. From the repeatability studies (n = 6) for 30.0 μM pyruvate revealed that the average value (), standard deviation (S.D) and coefficient of variation (CV %) were calculated to be 31.02 μM, ± 0.1914 μM and 0.62%, respectively.