Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33976
標題: Voltammetric determination of caffeine in beverages using a chemically modified electrode
作者: Zen, J.M.
曾志明
Ting, Y.S.
Shih, Y.
關鍵字: caffeine
beverages
chemically modified electrode
chromatographic determination
oxidation
acid
期刊/報告no:: Analyst, Volume 123, Issue 5, Page(s) 1145-1147.
摘要: A Nafion-ruthenium oxide pyrochlore chemically modified electrode is used for the determination of caffeine in beverages by square-wave voltammetry. Compared to a bare glassy carbon electrode, the chemically modified electrode exhibits a marked enhancement of the current response. A linear calibration curve is obtained over the 5-200 mu M range in 0.05 M HClO4 solution with a detection limit (3 sigma) of 2 mu M. The results of 15 successive repetitive measurement-regeneration cycles showed a relative standard deviation of 2.7% for 10 mu M caffeine. Thus, the electrode renewal gives a good reproducible surface. Quantitative analysis was performed by the standard addition method for caffeine content in tea, coffee, decaffeinated coffee, and cola beverages.
URI: http://hdl.handle.net/11455/33976
ISSN: 0003-2654
文章連結: http://dx.doi.org/10.1039/a708360b
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