Determination of Selected Trace Elements in Dietary Supplements Containing Plant Materials.
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Pol. J. Food Nutr. Sci. 2012;62(2):97–102
The need for analytical methods enabling determining trace metals concentration in herbal medicinal products and dietary supplements has increased in recent years due to the globalisation of international market and also due to the risk of using herbs contaminated by heavy metals. To this end, an analytical method was developed and validated for the accurate determination of trace elements (As, Cd, Co, Cr, Cu, Mn, Pb, Sr, Zn) in products in the form of tablets or capsules, herbal teas and their aqueous infusions. The validation of described procedure of digestion samples and determination metals by ICP-MS method, shows its usability in determination of trace elements in herbal products. Recovery percentage based on CRMs ranged from 90.1% to 110.7%, and the precision of the method was below 3%. Out of all microelements determined, the highest concentration was found for Mn in herbal teas. The daily intake of Mn with infusions accounted for 53.3% and 126.4%, which corresponded to 41.7% and 98.9% of the AI values for adult women and men, respectively. The method was also used for quality control of the labelled level of chromium and zinc. In all analysed samples, the concentrations of cadmium and lead were below the EC maximum levels stipulated for Cd and Pb in dietary supplements.