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A highly selective and accurate on-off ratiometric electrochemical biosensor to detect glucose was proposed based on gold nanoparticles (AuNPs)-glucose oxidase (GOD) nanocomposites as the catalyst for both the oxidation of glucose and the electrochemical reduction of O2 and the thionine as the inner reference signal for the first time. The reduction peak of O2 catalyzed by AuNPs-GOD at −0.45V decreased...
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