| Evening primrose meal: a source of natural antioxidants and scavenger of hydrogen peroxide and oxygen-derived free radicals. | |
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MedLine Citation:
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PMID: 10552455 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Evening primrose meal (EPM: 1% and 2%, w/w) reduced (p </= 0.05) the formation of 2-thiobarbituric acid-reactive substances (TBARS), hexanal, and total volatiles in cooked comminuted pork by 43.6-72.6%. Phenolic compounds in the EPM were extracted under optimum conditions (with 56% acetone at 71 degrees C for 47 min) predicted by a multivariate analysis. The resulting evening primrose crude extract (EPCE) inhibited the bleaching of beta-carotene in a model system. After 2 h of assay, the system containing 200 ppm EPCE [as (+)catechin equivalents] retained 86% of the initial beta-carotene whereas the control retained only 11%. Inhibition of the formation of TBARS, hexanal, and total volatiles in the cooked comminuted pork containing 200 ppm EPCE [as (+)catechin equivalents] ranged from 67. 3% to 97.5%. The EPCE inhibited the formation of conjugated dienes, hexanal, and total volatiles in stripped-bulk corn oil (18.5-63.6% inhibition) and stripped-corn oil-in-water emulsion systems (31.7-65. 6% inhibition). Hydrogen peroxide (H(2)O(2)), hydroxyl radical ((*)OH), and superoxide radical (O(2)(*)(-)) scavenging properties of the EPCE were comparable to those observed for authentic (+)catechin. At 200 ppm of the EPCE [as (+)catechin equivalents], a 100% quenching of (*)OH and O(2)(*)(-) was evident. The EPCE scavenged 44-91% of H(2)O(2) in the assay medium after 10 min as compared to 7% reduction in the control. |
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Authors:
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M Wettasinghe; F Shahidi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: 47 ISSN: 0021-8561 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 1999 May |
Date Detail:
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Created Date: 2000-08-18 Completed Date: 2000-08-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1801-12 Citation Subset: IM |
Affiliation:
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Department of Biochemistry, Memorial University of Newfoundland, St. John's, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Antioxidants / analysis* Cookery Corn Oil / chemistry Emulsions Flour Free Radical Scavengers / analysis* Free Radicals Hydrogen Peroxide Hydroxyl Radical Meat / analysis* Plant Extracts / isolation & purification, pharmacology* Seeds* Superoxides Swine Thiobarbituric Acid Reactive Substances / analysis beta Carotene / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Emulsions; 0/Free Radical Scavengers; 0/Free Radicals; 0/Plant Extracts; 0/Thiobarbituric Acid Reactive Substances; 11062-77-4/Superoxides; 3352-57-6/Hydroxyl Radical; 7235-40-7/beta Carotene; 7722-84-1/Hydrogen Peroxide; 8001-30-7/Corn Oil |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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