Journals on Medical Microbiology - BJSTR Journal

Abstract

A simple, low cost, sensitive, a selective #electrochemical method for the detection of caffeine (CA) was developed using polymethyl orange modified carbon paste electrode (PMO/CPE) by cyclic voltammetry (CV). It was found that caffeine shows well defined irreversible oxidation peak at 1350 mV Vs. Calomel electrode in 0.2 M PBS (pH 3.0) The effect of pH, Scan rate and concentration on the #voltammetric response of caffeine were studied. The linear range of peak current on the concentration of caffeine in the range from 1×10^-5 to 5×10^-5 and 6×10^-5 to 1.5×10^-4 M with a low detection limit of 5.7×10^-7 M and modified electrode shows a good reproducibility with a relative standard deviation of 4.16 %. The PMO/CPE electrochemical sensor showed better electrocatalytic activity compared to the bare carbon paste electrode (BCPE).The developing an effective method for the detection of CA becomes an active in the field of research. Among the different methods are developed electroanalytical method having more advantageous and become the most popular method. There are few methods are reported for the electrochemical detection of CA by using modified electrodes which includes boron-doped diamond electrodes, molecularly imprinted polymer modified carbon paste electrode, carbon fiber ultramicroelectrodes, and polymer modified glassy carbon electrode.

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Cyclic Voltammetric Investigation of Caffeine at Methyl Orange Modified Carbon Paste Electrode by JG Manjunatha in BJSTR