Process for preparing O-carboxymethyl chitosan covalent binding chemical modification electrode
A carboxymethyl chitosan and chemical modification technology, which is applied in the field of electrochemical analysis and detection, can solve the problems that it is difficult to simultaneously eliminate or reduce the influence of AA and UA determination, the interference of DA content, etc., so that the electrode modification layer is firm and easy to use. The effect of long life and convenient production
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[0015] Preparation of O-Carboxymethyl Chitosan Covalently Bonded Chemically Modified Electrode
[0016] The surface of the glassy carbon electrode was coated with 0.3 μm and 0.05 μm ultrafine Al 2 o 3 The suspension was polished on silk, respectively, with 1:1 HNO 3 , absolute ethanol, and ultrasonic cleaning in water for 5 minutes. Then put the GC electrode in the oxidation solution (0.3g NaNO 3 with 4.5g KMnO 4 After mixing, dissolve in 40 mL concentrated H 2 SO 4 middle) for 60min, take it out and wash it with secondary water, then use 3% H 2 o 2 The solution was soaked for 30min to reduce excess KMnO 4 , then dry the electrode under an infrared lamp, then soak it in thionyl chloride for 60 minutes, take out the electrode and wash it with formic acid, then transfer it to the modification solution and soak it for 40 minutes, and finally rinse it with formic acid and secondary water in order to wash it. Remove the non-chemically bonded O-carboxymethyl chitosan adheri...
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