The use of chromatographic and spectroscopic (colometric) methods for evaluation of quercetine in dietary supplements of plant origin

Recent years have witnessed a rapid increase in demand for dietary supplements which can be purchased over the counter and without medical consultation. They are widely advertised as panacea for all ailments that afflict the contemporary consumer. Products containing extracts from native and tropical plants as well as herbs have a growing share of the supplement market. TLC is a simple and inexpensive method that can be used in preliminary analyses of product quality. Thin layer chromatography is also an effective technique for isolating biologically active substances from complex pharmaceutical products and supplements. Quantitative analysis shows that quantitative and qualitative inaccuracies and misstatements may occur in the case of dietary supplements.