Systematic investigation for extraction and separation of polyphenols in tea leaves by magnetic ionic liquids

Journal of the Science of Food and Agriculture
Xueting FengShun Yao

Abstract

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 C3 MIMFeCl4 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. 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, C3 MIMFeCl4 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. 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 ...Continue Reading

References

Sep 6, 2003·Journal of Biomolecular Structure & Dynamics·Shohreh NafisiMaryam Damerchelli
Oct 3, 2003·Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences·R VenturaR De la Torre
Aug 1, 2006·Phytochemistry·Dale G NagleYu-Dong Zhou
Aug 11, 2011·Biochemical Pharmacology·Brahma N SinghRakesh K Srivastava
Feb 13, 2013·Journal of the Science of Food and Agriculture·Oktay KülenDavid G Holm

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