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7204200 
Journal Article 
Multi-Element Analysis, Bioavailability and Fractionation of Herbal Tea Products 
Szymczycha-Madeja, A; Welna, M; Zyrnicki, W; , 
2013 
Yes 
Journal of the Brazilian Chemical Society
ISSN: 0103-5053
EISSN: 1678-4790 
SOC BRASILEIRA QUIMICA 
SAO PAULO 
24 
5 
777-787 
WOS:000320468200010 
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. 
herbal tea; infusion; sequential extraction; FTIR spectroscopy; CHNS analysis