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A poly(4-amino-3-hydroxynaphthalene sulfonic acid)-modified glassy carbon electrode was developed for the voltammetric determination of nicotine. An oxidation signal at lower potential with higher current was obtained for nicotine at the polymer-modified electrode compared to bare glassy carbon electrode suggesting the electrocatalytic effect of the polymer film. Under optimum conditions, square wave voltammetry of nicotine showed oxidation at + 884 mV (vs. SCE) in phosphate buffer solution pH 7.5. The calibration curve was linear over the range 1.0 to 200.0 mM (R 2 = 0.9987) concentration of nicotine with a detection limit (S/N = 3) of 8.66 10 À7 mol L À1. Application of the proposed method to cigarette tobacco samples gave acceptable recovery results of 90.7 % to 107.2 %.

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