Document Detail

Flavonoid content of U.S. fruits, vegetables, and nuts.
MedLine Citation:
PMID:  17177529     Owner:  NLM     Status:  MEDLINE    
Analytical data are reported for 20 flavonoids (as aglycones) determined for more than 60 fresh fruits, vegetables, and nuts collected from four regions across the United States at two times of the year. Sample collection was designed and implemented by the Nutrient Data Laboratory (USDA). Analyses of eight flavan-3-ols (catechin, catechin gallate, epicatechin, epicatechin gallate, epigallocatechin, epigallocatechin gallate, gallocatechin, and gallocatechin gallate), six anthocyanins (cyanidin, delphinidin, malvidin, pelargonidin, peonidin, and petunidin), two flavanones (hesperetin and naringenin), two flavones (apigenin and luteolin), and two flavonols (myricetin and quercetin) were performed by the Food Composition Laboratory (USDA) using a hydrolysis method for the anthocyanidins, flavones, and flavonols and a direct extraction method for the flavan-3-ols and flavanones. Experimental results compare favorably (few statistically significant differences) to literature values in the flavonoid and proanthocyanidin database previously compiled by the Nutrient Data Laboratory. The results of this study showed a seasonal variation only for blueberries. This study also showed that the variation in the flavonoid content of foods, as purchased by the U.S. consumer, is very large. The relative standard deviation, averaged for each flavonoid in each food, was 168%.
James M Harnly; Robert F Doherty; Gary R Beecher; Joanne M Holden; David B Haytowitz; Seema Bhagwat; Susan Gebhardt
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  54     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-12-20     Completed Date:  2007-03-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9966-77     Citation Subset:  IM    
Food Composition Laboratory and Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705, USA.
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MeSH Terms
Flavonoids / analysis*
Food Analysis / methods
Fruit / chemistry*
Nuts / chemistry*
United States
Vegetables / chemistry*
Reg. No./Substance:

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