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Electrochemical characterization of gallic acid

Gallic acid (3, 4, 5 trihydroxybenzoic acid) is a polyphenol, known for strong anticancer, antioxidant, anti-inflammatory and antimutagenic properties. Additional advantage of selective cytotoxicity for cancerous cells, makes gallic acid important additive in food to prevent cancer risks. It can be abudantly found, in different plants and foodstuff, especially in honey, gallnuts, mango, oak bark and pomegranate. The main goal of this study was to detect gallic acid in model systems and real samples (tea, liquer and wine) with differential pulse voltammetry. Electrochemical research was performed in a three electrode voltammetric cell with working gold electrode, reference Ag/AgCl electrode and platinum wire counter electrode. Before each measurement the surface of working electrode was polished with alfa-Al2O3 powder (particle size 0.05 um) and the system was purged with high purity argon Ar5 (fiAr = 99.999 %). Differential pulse voltammogram has shown two oxidation peaks which correspond to oxidation of gallic acid. It was also determined that the anodic peak current of gallic acid increases with the increase of its concentration (linear response was obtained in the concentration range from 1 uM to 67 uM). Gallic acid was detected in real samples where its quantity varied from 4 uM till 35.6 uM.

gallic acid, differential pulse voltammetry, detection, real samples

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