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  • 1 Silesian University Institute of Chemistry, Department of Analytical Chemistry 9 Szkolna Street 40-006 Katowice Poland
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This paper describes rapid and cost-effective analytical procedures for determination of gallic acid after chromatographic separation. Optimum conditions were established for separation and assay of gallic acid, salicylic acid, and tannic acid by thin-layer and paper chromatography (PC). Detection was by means of a sensitive spectrophotometric method based on the coupled redox-complexation reactions occurring in the system Fe(III), gallic acid, and 2,2′-dipyridyl ( λmax = 522 nm). The procedure was then applied to the determination of gallic acid in a pharmaceutical preparation. Thin layer chromatographic analysis with densitometric UV detection at λ = 280 nm gave comparable results.

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