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An extended-gate field effect transistor (EGFET)of SnO_2/ITO glass was applied to manufacture the vitamin C sensor.Therefore,we immobilized the ascorbate oxidase with 3-glycidoxypropyltrimethoxysilane (GPTS)method to measure the different concentrations of the vitamin C solution in an optimum measurement environment.In order to find the best measurement conditions of the biosensor,we studied the vitamin C sensor in different pH values of the phosphate buffer solution (PBS).Additionally,we used experimental results to discuss the response time and response voltage to compare vitamin C with orange juice for the vitamin C sensor.
An extended-gate field effect transistor (EGFET) of SnO 2 / ITO glass was applied to manufacture the vitamin C sensor. Before, we immobilized the ascorbate oxidase with 3-glycidoxypropyltrimethoxysilane (GPTS) method to measure the different concentrations of the vitamin C solution in an optimum measurement environment. In order to find the best measurement conditions of the biosensor, we studied the vitamin C sensor in different pH values of the phosphate buffer solution (PBS). Additionally, we used experimental results to discuss the response time and response voltage to compare vitamin C with orange juice for the vitamin C sensor.