Voltammetric Determination of Caffeine in Coffee Using Anthraquinone Modified Carbon Paste Electrode
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Date
2008-07
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Addis Ababa Universty
Abstract
Anthraquinone modified carbon paste electrode is used for the determination of caffeine
in coffee. The optimized pH=12 value gives an advantages of undergoing square wave
voltammetry of real sample with less sample pretreatment steps. A linear calibration
curve is obtained over 0- 500 M in 0.1 M NaH2PO4 and Na2HPO4 buffer solution with a
detection limit (3) of 5 nM. Determination of caffeine in coffee was done by subtracting
the background current.
(Key words: CMCPEs, anthraquinone)
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Keywords
CMCPEs; anthraquinone