A novel amperometric bienzymatic biosensor for determination of glucose is developed by modifying thionine(TH)film on the electrochemical pretreated glassy carbon electrode(GCE)surface.Gold nanoparticles(GNPs)
glucose oxidase(GOD)and horseridesh peroxidase(HRP)are immolilized by electrostatic adsorption and Au-S
Au-N covalent bond self-assembly.Nafion solution is dropped on the modified electrode to prepare anti-interferential and fixed membrane.The experimental results show that the performance of the biosensor can be improved by the electrochemical polarization glassy carbon electrode in HNO3 solution.A good linear relationship between response current and glucose concentration in the range of 1×10-3
1
8×10-3mol/L
R=0.991 7
the detection limit is 5×10-5mol/L.The biosensor has high sensitivity
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