| Oxidation of ascorbic acid in stored orange juice is associated with reduced plasma vitamin C concentrations and elevated lipid peroxides. | |
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MedLine Citation:
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PMID: 15635354 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Ascorbic acid oxidizes in refrigerated orange juice, but the physiological relevance of this deterioration is unknown. We compared changes in plasma vitamin C and total lipid peroxides (thiobarbituric acid-reactive substances, TBARS) in the 2-hour period following consumption of commercial orange juices on day 1 vs day 8 of storage (4 degrees C). The ascorbic acid content decreased significantly after storage in juice reconstituted from frozen concentrate (117+/-8 vs 89+/-8 mg/8 fl oz, P =.001), but did not change in chilled juice (69+/-5 vs 64+/-12 mg/8 fl oz.). The mean incremental TBARS value was less on day 1 vs day 8 for juice from frozen concentrate (-0.46+/-0.72 and 0.70+/-0.53, P =.046), but did not differ for chilled juice (0.00+/-0.49 and 0.54+/-0.89). The incremental values for plasma TBARS and vitamin C in the 2-hour postprandial period were inversely related (r=-0.48, P =.017). These data indicate that the loss of ascorbic acid in refrigerated juice may impact postprandial oxidative stress. |
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Authors:
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Carol S Johnston; Joanna C Hale |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of the American Dietetic Association Volume: 105 ISSN: 0002-8223 ISO Abbreviation: J Am Diet Assoc Publication Date: 2005 Jan |
Date Detail:
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Created Date: 2005-01-06 Completed Date: 2005-02-17 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 7503061 Medline TA: J Am Diet Assoc Country: United States |
Other Details:
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Languages: eng Pagination: 106-9 Citation Subset: AIM; IM |
Affiliation:
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Department of Nutrition, Arizona State University, 7001 E Williams Field Rd, Mesa, AZ 85212, USA. carol.johnston@asu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Antioxidants / administration & dosage, metabolism* Ascorbic Acid / administration & dosage, blood, metabolism* Beverages / analysis* Citrus sinensis* Cold Temperature Cross-Over Studies Drug Stability Female Food Handling / methods Food Preservation / methods* Frozen Foods / standards Humans Lipid Peroxidation / drug effects, physiology* Oxidation-Reduction Postprandial Period Thiobarbituric Acid Reactive Substances / analysis Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Thiobarbituric Acid Reactive Substances; 50-81-7/Ascorbic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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