期刊
FOOD CHEMISTRY
卷 210, 期 -, 页码 156-162出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.04.106
关键词
Poly(4-amino-3-hydroxynaphthalene sulfonic acid); Square wave voltammetry; Caffeine; Paracetamol; Coca-Cola; Pepsi-Cola and tea
资金
- International Science Programe (ISP), Uppsala University, Sweden
Poly(4-amino-3-hydroxynaphthalene sulfonic acid)-modified glassy carbon electrode (poly(AHNSA)/GCE) was prepared for simultaneous determination of caffeine and paracetamol using square-wave voltammetry. The method was used to study the effects of pH and scan rate on the voltammetric response of caffeine and paracetamol. Linear calibration curves in the range of 10-125 mu M were obtained for both caffeine and paracetamol in acetate buffer solution of pH 4.5 with a correlation coefficient of 0.9989 and 0.9986, respectively. The calculated detection limits (S/N = 3) were 0.79 mu M for caffeine and 0.45 mu M for paracetamol. The effects of some interfering substances in the determination of caffeine and paracetamol were also studied and their interferences were found to be negligible which proved the selectivity of the modified electrode. The method was successfully applied for the quantitative determination of caffeine and paracetamol in Coca-Cola, Pepsi-Cola and tea samples. (C) 2016 Elsevier Ltd. All rights reserved.
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