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  • The following terms were not found in PubMed: method+Ethanolic, extract+Ethyl, fraction+Green.
J Sci Food Agric. 2014 Nov;94(14):2921-8. doi: 10.1002/jsfa.6633. Epub 2014 Mar 26.

Catechin concentrates of garden tea leaves (Camellia sinensis L.): extraction/isolation and evaluation of chemical composition.

Author information

1
Department of Food Engineering, CSIR (Council of Scientific and Industrial Research, India), Central Food Technological Research Institute, Mysore, 570 020, India; Academy of Scientific and Innovative Research, New Delhi, 110 001, India.

Abstract

BACKGROUND:

Solid-liquid (SLE) and liquid-liquid (LLE) extraction techniques were applied to extract catechins and caffeine from quick mechanically expelled tea leaf juice (QMETLJ) and freeze-dried (FD)-QMETLJ of Camellia sinensis L. The concentrates obtained were analyzed for total polyphenol content and antioxidant activity (DPPH(•) inhibition, FRAP and phosphomolybdenum assay). Catechins were identified and quantified using HPLC.

RESULTS:

Overall, 95% (v/v) ethanol was the best solvent system for extracting total polyphenols (355.26 ± 23.68 to 457.89 ± 28.94 g GAE kg(-1) extractable solid yield (ESY)) and antioxidants (DPPH(•) inhibition, 16.97 ± 0.52 to 20.83 ± 3.11%; FRAP, 4.15 ± 0.32 to 6.38 ± 0.57 mmol TE g(-1) ESY; Mo(V) reduction, 2.47 ± 0.19 to 3.84 ± 0.39 mmol AAE g(-1) ESY) from FD-QMETLJ. Similarly, in LLE, ethyl acetate showed the best results for recovering polyphenols (960.52 ± 7.89 g GAE kg(-1) ESY) and antioxidants (DPPH(•) inhibition, 42.39 ± 0.91%; FRAP, 11.39 ± 0.83 mmol TE g(-1) ESY; Mo(V) reduction, 6.71 ± 1.14 mmol AAE g(-1) ESY) from QMETLJ.

CONCLUSION:

It was found that 95% ethanol can be used to increase the total polyphenols and antioxidants in extracts from FD-QMETLJ, while ethyl acetate can be effectively employed for concentrating catechins from QMETLJ.

KEYWORDS:

Camellia sinensis L; antioxidant activity; catechins; liquid-liquid extraction; solid-liquid extraction

PMID:
24585505
DOI:
10.1002/jsfa.6633
[Indexed for MEDLINE]

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