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Authors
Affiliations
1 Chemistry Department, Haramaya University, Post Box : 138, Dire Dawa, ET
2 Biology Department, Haramaya University, Post Box : 138, Dire Dawa, ET
Source
Journal of Surface Science and Technology, Vol 30, No 3-4 (2014), Pagination: 149-161
Abstract
Polyaniline (PANI)-modified glassy carbon electrode has been synthesized by electropolymerizing aniline for determining acetylsalicylic acid (ASA in pharmaceutical samples using cyclic and differential pulse voltammetric techniques. The best performance of the PANI modified glassy carbon electrode in 0.04 M Britton Robinson buffer was obtained at pH 2.0. Under these conditions single oxidation peak at a potential of 250 mV vs Ag/AgCl/sat'd KCl, characteristic of an irreversible reaction, was observed. Studies on the effects of pH, scan rate and substrate concentration revealed irreversible diffusion controlled electrode redox reaction. The PANI modified glassy carbon electrode showed higher electro-catalytic efficiency, compared to the unmodified one, for ASA determination.
Keywords
Aspirin, Electro-Catalytic Efficiency, Pharmaceutical, Polyaniline, Voltammetry.
