Glucose Oxidase Assisted Visual Detection of Glucose Using Oxygen Deficient α-MoO Nanoflakes
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Chemistry
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An optical method is described for the quantitation of glucose by using oxygen-deficient α-MoO nanoflakes. It is based on the use of glucose oxidase (GOx) which produces hydrogen peroxide on oxidation of glucose. Hydrogen peroxide then oxidizes the α-MoO nanoflakes, and this results in a visible color change from blue to colorless. The color change can be measured photometrically at 740 nm. The method has a 68 nM detection limit. Graphical Abstract Mechanism of glucose detection using blue colored oxygen deficient 2D α-MoO nanoflakes. Hydrogen peroxide (HO) is formed as a by-product in the conversion of glucose to glucono-1,5-lactone by glucose oxidase (GO). In the presence of HO, the oxygen vacancies in α-MoO nanoflakes are filled up, and this leads to the loss of blue color of the nanoflakes because they are converted back to colorless bulk α-MoO.
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