A Reagentless Alcohol Sensor Based on Thionine-TDI Modified Glassy Carbon Electrode

Abstract

Abstract: Alcohol dehydrogenase(ADH) and the oxidized form of nicotinamide adenine dinucleotide(NAD⁺) were cross-linked directly in aid of the reaction of thionine and toluene diisocyanate(TDI) on the surface of glassy carbon electrode to yield a reagentless alcohol sensor. The NAD⁺was converted to NADH by oxidation of alcohol catalyzed by ADH and the NADH formed was oxidized electrochemically to the original NAD⁺by thionine-TDI mediator, thus giving the catalytic current for target analysis. The peak current was linearly related to the concentration of alcohol in the range of 1-15mmol/L. The influence of various experimental conditions was also explored for optimum analytical performance.The sensor remains relatively stable for about 15 days.

Key words: Thionine-TDI derivate, NAD⁺, ADH, Alcohol sensor

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YU Ai-Min, HAN Ji-Lin, YANG Ke-Sheng, CHEN Hong-Yuan. A Reagentless Alcohol Sensor Based on Thionine-TDI Modified Glassy Carbon Electrode[J]. Chem. J. Chinese Universities, 1995, 16(8): 1204.

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A Reagentless Alcohol Sensor Based on Thionine-TDI Modified Glassy Carbon Electrode

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