Abstract
Herbal teas (Mentha piperitae folium and mixture Marticaria chamomilla flos with Lavandula officinalis flos) were compared considering the total contents of micro (Al, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Sr, Ti, V) and macro (C, H, N, S, Ca, Mg, P) elements, bioavailability and fractionation. Different methods (inductively coupled plasma optical emission spectrometry (ICP OES), Fourier transform infrared spectroscopy (FTIR) and CHNS elemental analysis) were applied. The microwave-assisted digestion procedure was found to be more effective than the hot-plate heating for the wet acid digestion of tea. The application of the modified BCR (Community Bureau of Reference) sequential extraction procedure exhibited differences in the concentrations of metal bound to reducible and oxidizable fractions. The accuracy of method was verified by analysis of certified reference material INCT-TL-1 Tea Leaves. The daily intake of all elements from the analyzed herbal tea infusion did not exceed the maximum permissible levels and does not constitute health risk.
Highlights
The last few decades have witnessed a rapid development in the diet studies concerning the determination of trace elements, which reflect their role in human health and nutrition
The determination of the element contents in different teas and medicinal plants has been done in previous publications with the use of various methods, such as flame atomic absorption spectrometry (F AAS),[2,5,7,10,12,16,17] graphite furnace atomic absorption spectrometry (GF AAS),[18] electrothermal atomic absorption spectrometry (ET AAS),[2,4] inductively coupled plasma optical emission spectrometry (ICP OES)[3,8,16] and inductively coupled plasma mass spectrometry (ICP MS).[13,19]
On the basis of the results shown in this table, microwave digestion was found to be the most effective herbal tea digestion method
Summary
The last few decades have witnessed a rapid development in the diet studies concerning the determination of trace elements, which reflect their role in human health and nutrition. World.[3,4,5,6,7,8,9,10,11,12] A number of studies has been focused on the total concentration of metals in tea infusions.[10,13,14,15] In general, the determination of the element contents in different teas and medicinal plants has been done in previous publications with the use of various methods, such as flame atomic absorption spectrometry (F AAS),[2,5,7,10,12,16,17] graphite furnace atomic absorption spectrometry (GF AAS),[18] electrothermal atomic absorption spectrometry (ET AAS),[2,4] inductively coupled plasma optical emission spectrometry (ICP OES)[3,8,16] and inductively coupled plasma mass spectrometry (ICP MS).[13,19]. The present study undertook to determine macro and microelements in herbal teas (peppermint, mixed chamomile and lavender) and in their infusions, as well as to obtain more complex information about the tea products by application of IR spectroscopy and extraction. With each set of digestions and extractions, a blank sample was simultaneously prepared through the complete procedure, analyzed and used for correction of the analytical signals
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