Voltammetric Determination of Gallic Acid and its Content in Tea Samples Using Modified Iodine-Coated Platinum Electrode
doi.org/10.26538/tjnpr/v5i6.15
Keywords:
Gallic acid, Tea, Voltammetric analysis, Iodine-coated platinum electrode, Modified platinum electrodeAbstract
While platinum electrode shows high reactivity towards adsorption processes, iodine-coated platinum electrode offers remarkable inertness toward these processes. Therefore, iodine-coated platinum electrodes have become very significant in voltammetric applications. This study reports the use of the modified iodine-coated polycrystalline platinum electrode as a voltammetric sensor for gallic acid determination in tea samples. The optimized experimental parameters for determining gallic acid used 0.5M H2SO4 as a supporting electrolyte with a scan rate of 50 mV/s. The anodic peak related to gallic acid oxidation was centered at approximately 0.60V. The extended detected linear range for the developed method was between 0.025 and 2.0 mM. The anodic current showed excellent linearity with 2 =0.9975. The limit of detection (LOD) and limit of quantitation (LOQ) were 0.022mM and 0.0669 mM, respectively, which confirmed the method’s sensitivity. The investigation for the effect of potential interferences from tea components indicated a specific selectivity toward gallic acid with only slight interference due to the presence of ascorbic acid and the absence of any electrochemical response toward glucose, caffeine, Ni2+, K+ , Na+ , and Zn2+. The proposed method was successfully applied in the analysis of gallic acid in tea samples. The recovery values (90.0 - 103.25%) obtained in this study support the use of the developed method to analyze gallic acid in tea samples.
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