Title : Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.) ( Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.) )
Authors: Reza Farhoosh , غلامعلی گلی موحد , Mohammad Hossein Haddad khodaparast ,
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Abstract
The antioxidant activity of various extracts of old tea leaves (OTL) and black tea wastes (BTW) in comparison with that of green tea leaves (GTL) was evaluated. The highest extraction yield and antioxidant activity were found in hot water extracts of GTL. Hot water extracts of OTL and BTW showed the same statistically significant antioxidant activities (P < 0.05). Also, there was no statistically significant difference between the antioxidant activities of OTL and BTW extracts obtained by the other two extraction methods (ethyl acetate and methanolic methods) and, in some cases, BTW extracts acted even better than OTL extracts. The antioxidant activity of tea extracts was not concomitant with the development of their reducing power. This suggested that the antioxidant activity of tea extracts likely involves other mechanisms in addition to those of reductones. Totally, BTW extracts had antioxidant activities comparable with or even better than those of OTL extracts. Hence, OTL and BTW, which are often considered as agricultural wastes, can be used as potent natural antioxidative sources. © 2005 Elsevier Ltd. All rights reserved.
Keywords
Antioxidant activity; Black tea wastes; Extraction method; Green and old tea leaves; Reducing power; Tea extracts
@article{paperid:204477,
author = {Farhoosh, Reza and غلامعلی گلی موحد and Haddad Khodaparast, Mohammad Hossein},
title = {Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.)},
journal = {Food Chemistry},
year = {2007},
volume = {100},
number = {1},
month = {March},
issn = {0308-8146},
pages = {231--236},
numpages = {5},
keywords = {Antioxidant activity; Black tea wastes; Extraction method; Green and old tea leaves; Reducing power; Tea extracts},
}
%0 Journal Article
%T Antioxidant activity of various extracts of old tea leaves and black tea wastes (Camellia sinensis L.)
%A Farhoosh, Reza
%A غلامعلی گلی موحد
%A Haddad Khodaparast, Mohammad Hossein
%J Food Chemistry
%@ 0308-8146
%D 2007
