Cyclic Voltammetric Investigation of Caffeine at
Methyl Orange Modified Carbon Paste Electrode

C Raril; JG Manjunatha

doi:10.26717/BJSTR.2018.09.001804

Research ArticleOpen Access

Cyclic Voltammetric Investigation of Caffeine at Methyl Orange Modified Carbon Paste Electrode

Volume 9 - Issue 3

C Raril and JG Manjunatha*

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- *Department of Chemistry, Mangalore University Constituent College, India
*Corresponding author: JG Manjunatha, Department of Chemistry, FMKMC College, Madikeri, Mangalore University Constituent College, Karnataka, India

Received: September 24, 2018; Published: September 28, 2018

DOI: 10.26717/BJSTR.2018.09.001804

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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).

Keywords: Caffeine; Carbon Paste Electrode; Cyclic Voltammetry; Methyl Orange