期刊
TALANTA
卷 65, 期 4, 页码 1045-1051出版社
ELSEVIER
DOI: 10.1016/j.talanta.2004.08.036
关键词
optical sensor film; vitamin C; polyaniline; redox
An analytical method based on the absorption changes of chemically polymerised polyaniline at 700 rum is proposed for the determination of Vitamin C. Vitamin C produces a polyanifine 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. (C) 2004 Elsevier B.V. All rights reserved.
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