Voltammetric Determination Of Caffeine In Coffee Using Anthraquinone Modified Carbon Paste Electrode

Anthraquinone modified carbon paste electrode is used for the determination of caffeinernin coffee. The optimized pH=12 value gives an advantages of undergoing square wavernvoltammetry of real sample with less sample pretreatment steps. A linear calibrationrncurve is obtained over 0- 500 M in 0.1 M NaH2PO4 and Na2HPO4 buffer solution with arndetection limit (3) of 5 nM. Determination of caffeine in coffee was done by subtractingrnthe background current.rn(Key words: CMCPEs, anthraquinone)

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