In this study, a new amperometric carbon paste enzyme electrode for determination of ethanol was developed. The carbon paste was prepared by mixing alcohol dehydrogenase, its coenzyme nicotinamide adenine dinucleotide (oxidized form, NAD þ ), poly(vinylferrocene) (PVF) that was used as a mediator, graphite powder and paraffin oil, then the paste was placed into cavity of a glass electrode body. Determination of ethanol was performed by oxidation of nicotinamide adenine dinucleotide (reduced form, NADH) generated enzymatically at þ0.7 V. The effects of enzyme, coenzyme and PVF amounts; pH; buffer concentration and temperature were investigated. The linear working range of the enzyme electrode was 4.0 Â 10 24 -4.5 Â 10 23 M, determination limit was 3.9 Â 10 24 M and response time was 50 s. The optimum pH, buffer concentration, temperature, and amounts of enzyme, NAD þ and PVF for enzyme electrode were found to be 8.5, 0.10 M, 378C, 2.0, 6.0, and 12.0 mg, respectively. The storage stability of enzyme electrode
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