Abstract
Electrochemical investigation of catechol using square wave voltammetry with anthraquinone modified carbon paste electrode was found to be very sensitive. Compared with the unmodified carbon paste electrode, the anthraquinone modified electrode remarkably increases the peak currents of catechol, and greatly lowers the peak potential separation. Two varieties of tea, namely green, and black variety: Wush Wush tea, from Ethiopia, known by its brand name were investigated. Responses for the extracts using ethanol: water (1:4) % v/v showed green tea to be superior in catechol content. Optimization of different variables such as pH of working solution, modifier composition and square wave parameters such as frequency, amplitude and step potential were made to improve the method efficiency during the experiment. The reproducibility for the nine repeated analysis of 80 μmol·L－1 of catechol gave a relative standard deviation of 3.65% and linear calibration plots were obtained in the range 6 to 80 μmol·L－1 with (R = 0.998) and the detection limit with (S/N = 3) was as low as 2.155 x 10－7 mol·L－1.
Highlights
Catechol (1,2-benzenediol) is a natural polyphenolic compound that widely exists in higher plants such as tea, vegetables, fruits, tobacco and some traditional Chinese medicines
The response in cyclic voltammograms during the experiment revealed that in case of unmodified carbon paste electrode, the oxidation peak was observed at 292 mV during the anodic sweep
Electrochemical analysis employing anthraquinone modified carbon paste electrode (CPE) has been developed for the determination of catechol with the detection limit of 2.155 × 10−7 mol·L−1
Summary
Catechol (1,2-benzenediol) is a natural polyphenolic compound that widely exists in higher plants such as tea, vegetables, fruits, tobacco and some traditional Chinese medicines. It has a biological importance such as antioxidation, anti-virus, flower stimulating effect and affecting the activities of some enzymes [1,2,3]. The use of carbon paste modified with anthraquinone as a sensitive electrochemical electrode was established for the determination of catechol using square wave voltammetry. Parameters such as pH of working solution, amount of modifier, frequency, amplitude and step potential were optimized to improve the method efficiency during the experiment. Real sample of tea (Camellia sinensis L.) varieties green tea and black tea has been proven to produce a good response towards catechol
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