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Caffeine Sensitive Electrode and Its Analytical Applications

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In this research, for the first time, a caffeine potentiometric membrane sensor based on 4-tert-butyl-2,6-diphenyl-2H-thiopyran (BDT) is presented. The sensor exhibited a near-Nernstian response over a concentration range of 3.0 × 10−7 mol L−1−1.0 × 10−2 mol L−1, with a detection limit of 2.0 × 10−7 mol L−1. The best performance was achieved with a membrane composition, consisting of 32% PVC, 56% ortho-nitrophenyloctyl ether (o-NPOE), 4% BDT and 8% oleic acid (OA). The sensor was successfully applied to determine caffeine in coffee, tea, pharmaceutical dosage forms and human urine samples. The developed sensor did not display statistically significant differences with the standard procedures.
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Document Type: Research Article

Publication date: February 1, 2009

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