Sensor film for Vitamin C determination based on absorption properties of polyaniline |
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Authors: | Andreu Yolanda de Marcos Susana Castillo Juan R Galbán Javier |
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Affiliation: | Analytical Spectroscopy and Sensors Group (GEAS), Analytical Chemistry Department, Science Faculty, University of Zaragoza, Zaragoza 50009, Spain |
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Abstract: | An analytical method based on the absorption changes of chemically polymerised polyaniline at 700 nm is proposed for the determination of Vitamin C. Vitamin C produces a polyaniline film reduction, originating changes in its absorbance proportional to the Vitamin C concentration. The optimum reaction conditions and the analytical characteristics have been studied. The linear response of the method ranged from 0.10 to 1.0 mg l−1 for a 6 min reaction time and from 1.0 to 8.0 mg l−1 for a 2 min reaction time. Reproducibility, expressed as the coefficient of variation, was 0.8% (6 min reaction time) and 2.3% (2 min reaction time) (n = 10). The method has been applied to Vitamin C determination in pharmaceutical preparations and commercial fruit juices. The results were compared with those obtained by the 2,6-dichlorophenolindophenol titration method (the AOAC Official Method) and no systematic errors were observed. |
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Keywords: | Optical sensor film Vitamin C Polyaniline Redox |
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