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Extraction of Al, Cu, Fe, Mn, Ni and Zn–polyphenol complexes from black tea infusions by Amberlite resins
Author(s) -
Mucchino Claudio,
Musci Marilena
Publication year - 2014
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6547
Subject(s) - amberlite , chemistry , polyphenol , extraction (chemistry) , bioavailability , atomic absorption spectroscopy , nuclear chemistry , ion exchange resin , black tea , chromatography , inorganic chemistry , organic chemistry , antioxidant , adsorption , food science , bioinformatics , physics , quantum mechanics , biology
BACKGROUND Metals can be present in tea infusion as ions or as complexes with endogenous bioligands naturally occurring in tea, especially with polyphenols. Their chemical form, i.e. free or metal complexes, can affect their actual bioavailability, gastrointestinal absorption and possible toxicity . RESULTS The total amount of Al, Cu, Fe, Mn, Ni and Zn in black tea infusions was determined by inductively coupled plasma–atomic emission spectroscopy after mineralization and compared with their fractions occurring as polyphenol complexes, extracted using two different polymeric resins: Amberlite XAD ‐2 and Amberlite XAD ‐7 . CONCLUSION The obtained results demonstrated the suitability of Amberlite resins for the extraction of Al, Cu, Fe, Mn, Ni and Zn–polyphenol complexes from black tea infusions and for the evaluation of the actual distribution of the considered metals among different chemical species, i.e. as free metals and as polyphenol complexes. © 2013 Society of Chemical Industry