STUDIES ON BIO-ANTIOXIDANTS——PROOXIDATION OF VITAMIN E ON THE AUTOXIDATION OF LINOLEIC ACID IN SODIUM DODECYL SULFATE MICELLES

STUDIES ON BIO-ANTIOXIDANTS——PROOXIDATION OF VITAMIN E ON THE AUTOXIDATION OF LINOLEIC ACID IN SODIUM DODECYL SULFATE MICELLES

The reaction of vitamin E (α-tocopherol) with linoleic acid containing peroxidized linoleic acid has been studied. No significant reaction was found in ethanol solution, whereas in sodium dodecyl sulfate micelles vitamin E reacted rapidly with peroxidized linoleic acid, and thereby induced the perox...

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Veröffentlicht in:中国科学：化学英文版 1991 (7), p.787-795
1. Verfasser: 刘中立 王丽娟 刘有成
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acid
effect
linoleic
mieellar
oxidation
per
vitamin
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description The reaction of vitamin E (α-tocopherol) with linoleic acid containing peroxidized linoleic acid has been studied. No significant reaction was found in ethanol solution, whereas in sodium dodecyl sulfate micelles vitamin E reacted rapidly with peroxidized linoleic acid, and thereby induced the peroxidation of linoleic acid, leading to oxygen absorption. The reaction kinetics was studied in detail by u. v. spectroscopy, HPLC and ESR spectroscopy. It was found that the main product was α-tocopherone with α-tocopheroxy radical as the reaction intermediate. A mechanism involving two consecutive bimolecular reactions between peroxidized linoleic acid and a-tocopherol and between peroxidized linoleic acid and a-tocopheroxy radical, with rate constant 2.93 and 6.21 mol/L-1s-1 respectively is proposed. The micellar effect on the reaction is discussed.
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No significant reaction was found in ethanol solution, whereas in sodium dodecyl sulfate micelles vitamin E reacted rapidly with peroxidized linoleic acid, and thereby induced the peroxidation of linoleic acid, leading to oxygen absorption. The reaction kinetics was studied in detail by u. v. spectroscopy, HPLC and ESR spectroscopy. It was found that the main product was α-tocopherone with α-tocopheroxy radical as the reaction intermediate. A mechanism involving two consecutive bimolecular reactions between peroxidized linoleic acid and a-tocopherol and between peroxidized linoleic acid and a-tocopheroxy radical, with rate constant 2.93 and 6.21 mol/L-1s-1 respectively is proposed. The micellar effect on the reaction is discussed.</description><identifier>ISSN: 1674-7291</identifier><identifier>EISSN: 1869-1870</identifier><language>eng</language><subject>acid ; effect ; linoleic ; mieellar ; oxidation ; per ; vitamin</subject><ispartof>中国科学：化学英文版, 1991 (7), p.787-795</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://image.cqvip.com/vip1000/qk/60113X/60113X.jpg</thumbnail><link.rule.ids>314,777,781,4010</link.rule.ids></links><search><creatorcontrib>刘中立 王丽娟 刘有成</creatorcontrib><title>STUDIES ON BIO-ANTIOXIDANTS——PROOXIDATION OF VITAMIN E ON THE AUTOXIDATION OF LINOLEIC ACID IN SODIUM DODECYL SULFATE MICELLES</title><title>中国科学：化学英文版</title><addtitle>SCIENCE CHINA Chemistry</addtitle><description>The reaction of vitamin E (α-tocopherol) with linoleic acid containing peroxidized linoleic acid has been studied. 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subjects acid
effect
linoleic
mieellar
oxidation
per
vitamin
title STUDIES ON BIO-ANTIOXIDANTS——PROOXIDATION OF VITAMIN E ON THE AUTOXIDATION OF LINOLEIC ACID IN SODIUM DODECYL SULFATE MICELLES
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