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Systematic investigation for extraction and separation of polyphenols in tea leaves by magnetic ionic liquids
Author(s) -
Feng Xueting,
Zhang Wei,
Zhang Tenghe,
Yao Shun
Publication year - 2018
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.8983
Subject(s) - polyphenol , extraction (chemistry) , chemistry , ionic liquid , aqueous solution , chromatography , caffeine , solvent , antioxidant , organic chemistry , catalysis , medicine , endocrinology
BACKGROUND Magnetic separation has become a mature industrial technique in many fields and its application in the food and agricultural fields is expected for further extension. Furthermore, there has been little application of magnetic ionic liquids in the preparation of bioactive products. In the present study, 0.8 mol L –1 C 3 MIMFeCl 4 in its aqueous solution was found to be ideal for the extraction of active constituents from tea leaves. After extraction, polyphenols, caffeine and ionic liquid were also satisfactorily separated from the crude extract by various easy operations. RESULTS The average extraction efficiency of tea polyphenols could reach up to 185.38 g kg –1 and the recovery percent of the magnetic ionic liquid was 99.8% through an external magnetic field. The extraction process was more consistent with a pseudo‐second order kinetic model. Moreover, C 3 MIMFeCl 4 had no effect on the stability of tea polyphenols, which was very different from ordinary ferric salt. The presence of magnetic ionic liquid had a positive effect on the antioxidant activity of the product. CONCLUSION The developed method had a good performance for selective extraction together with separation of tea polyphenols and caffeine, which is expected in the preparation of more similar active components from food and agricultural resources as a useful multifunctional solvent. © 2018 Society of Chemical Industry