Document Detail

Catechin content of 18 teas and a green tea extract supplement correlates with the antioxidant capacity.
MedLine Citation:
PMID:  12881018     Owner:  NLM     Status:  MEDLINE    
Our literature review of currently available data in the area of tea and cancer prevention demonstrated that there is more conclusive evidence for the chemopreventive effect of green tea compared with black tea. We suggest that this is due to a large variation of the flavanol content in tea, which is not taken into consideration in most of the epidemiological studies. It was the purpose of this study to determine the flavanol content of various teas and tea products and to correlate it with their radical scavenging activity. A modified oxygen radical absorbance capacity (ORAC) assay at pH 5.5 was utilized. The total flavavol content varied from 21.2 to 103.2 mg/g for regular teas and from 4.6 to 39.0 mg/g for decaffeinated teas. The ORAC value varied from 728 to 1686 trolox equivalents/g tea for regular teas and from 507 to 845 trolox equivalents/g for decaffeinated teas. There was a significant correlation of flavanol content to ORAC value (r = 0.79, P = 0.0001) for the teas and green tea extract. The large variation in flavanol content and ORAC value among various brands and types of tea provides critical information for investigators using tea in studies of nutrition and cancer prevention.
Susanne M Henning; Claudia Fajardo-Lira; Hyun W Lee; Arthur A Youssefian; Vay L W Go; David Heber
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nutrition and cancer     Volume:  45     ISSN:  0163-5581     ISO Abbreviation:  Nutr Cancer     Publication Date:  2003  
Date Detail:
Created Date:  2003-07-25     Completed Date:  2004-02-03     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7905040     Medline TA:  Nutr Cancer     Country:  United States    
Other Details:
Languages:  eng     Pagination:  226-35     Citation Subset:  IM    
UCLA Center for Human Nutrition, School of Medicine, Warren Hall 14-166, 900 Veteran Avenue, Los Angeles, CA 90095, USA.
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MeSH Terms
Antioxidants / analysis*
Catechin / analysis*
Flavonols / analysis*
Free Radical Scavengers
Hydrogen-Ion Concentration
Plant Extracts / chemistry
Tea / chemistry*
Reg. No./Substance:
0/Antioxidants; 0/Flavonols; 0/Free Radical Scavengers; 0/Plant Extracts; 0/Tea; 154-23-4/Catechin

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