Document Detail

Phytochemicals and antioxidant properties in wheat bran.
MedLine Citation:
PMID:  15453674     Owner:  NLM     Status:  MEDLINE    
Bran samples of seven wheat varieties from four different countries were examined and compared for their phytochemical compositions and antioxidant activities. Phenolic acid composition, tocopherol content, carotenoid profile, and total phenolic content were examined for the phytochemical composition of wheat bran, whereas the measured antioxidant activities were free radical scavenging properties against 2,2-diphenyl-1-picrylhydrazyl radical, radical cation 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt, peroxide radical anion O(2)(.-), and oxygen radical and chelating capacities. The results showed that the tested wheat bran samples differed in their phytochemical compositions and antioxidant properties. Ferulic acid, with a concentration range of 99-231 microg/g, was the predominant phenolic acid in all of the tested bran samples and accounted for about 46-67% of total phenolic acids on a weight basis. The concentrations for alpha-, delta-, and gamma- tocopherols were 1.28-21.29, 0.23-7.0, and 0.92-6.90 microg/g, respectively. In addition, lutein and cryptoxanthin were detected in all of the tested bran samples with levels of 0.50-1.80 and 0.18-0.64 microg/g, respectively. Zeaxanthin was detected in the six bran samples, and the greatest zeaxanthin concentration of 2.19 microg/g was observed in the Australian general purpose wheat bran. Beta-carotene was detected in four of the tested bran samples at a range of 0.09-0.40 microg/g. These data suggest that wheat and wheat bran from different countries may differ in their potentials for serving as dietary sources of natural antioxidants.
Kequan Zhou; Lan Su; Liangli Lucy Yu
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  52     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-09-29     Completed Date:  2004-11-19     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6108-14     Citation Subset:  IM    
Department of Nutrition and Food Science, 0112 Skinner Building, University of Maryland, College Park, MD 20742, USA.
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MeSH Terms
Antioxidants / analysis*
Biphenyl Compounds
Carotenoids / analysis
Chelating Agents
Dietary Fiber / analysis*
Free Radical Scavengers / analysis,  chemistry
Hydroxybenzoic Acids / analysis
Phenols / analysis
Picrates / chemistry
Sulfonic Acids / chemistry
Superoxides / chemistry
Tocopherols / analysis
Reg. No./Substance:
0/Antioxidants; 0/Benzothiazoles; 0/Biphenyl Compounds; 0/Chelating Agents; 0/Free Radical Scavengers; 0/Hydroxybenzoic Acids; 0/Phenols; 0/Picrates; 0/Sulfonic Acids; 11062-77-4/Superoxides; 1406-66-2/Tocopherols; 1898-66-4/2,2-diphenyl-1-picrylhydrazyl; 28752-68-3/2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; 29656-58-4/phenolic acid; 36-88-4/Carotenoids

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