Electrochemical Preparation of a Molecularly Imprinted Polypyrrole-modified Pencil Graphite Electrode for Determination of Ascorbic AcidReportar como inadecuado




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Anadolu University, Faculty of Science, Department of Chemistry, 26470 Eskisehir, Turkey





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Abstract A molecularly imprinted polymer MIP polypyrrole PPy-based film was fabricated for the determination of ascorbic acid. The film was prepared by incorporation of a template molecule ascorbic acid during the electropolymerization of pyrrole onto a pencil graphite electrode PGE in aqueous solution using a cyclic voltammetry method. The performance of the imprinted and non-imprinted NIP films was evaluated by differential pulse voltammetry DPV. The effect of pH, monomer and template concentrations, electropolymerization cycles and interferents on the performance of the MIP electrode was investigated and optimized. The molecularly imprinted film exhibited a high selectivity and sensitivity toward ascorbic acid. The DPV peak current showed a linear dependence on the ascorbic acid concentration and a linear calibration curve was obtained in the range of 0.25 to 7.0 mM of ascorbic acid with a correlation coefficient of 0.9946. The detection limit 3σ was determined as 7.4x10-5 M S-N=3. The molecularly-imprinted polypyrrole-modified pencil graphite electrode showed a stable and reproducible response, without any influence of interferents commonly existing in pharmaceutical samples. The proposed method is simple and quick. The PPy electrodes have a low response time, good mechanical stability and are disposable simple to construct. View Full-Text

Keywords: Ascorbic acid; polypyrrole; pencil graphite electrode; molecularly imprinted polymer Ascorbic acid; polypyrrole; pencil graphite electrode; molecularly imprinted polymer





Autor: Levent Özcan, Mutlu Sahin and Yücel Sahin *

Fuente: http://mdpi.com/



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