Oxidation of .ALPHA.-Tocopherol during the Peroxidation of Dilinoleoylphosphatidylcholine in Liposomes.
Bibliographic Information
- Other Title
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- Oxidation of<i>α</i>-Tocopherol during the Peroxidation of Dilinoleoylphosphatidylcholine in Liposomes
- Oxidation of α-tocopherol during the peroxidation of dilinoleoylphosphatidylcholine in liposomes
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Abstract
Liposomal suspensions of dilinoleoylphosphatidylcholine (DLPC) containing α-tocopherol (0.1mol%, based on DLPC) were oxidized at 37°C. The oxidation was initiated by a lipid-soluble or water-soluble free radical initiator, or by the addition of CuSO4 and fructose. In all the oxidation systems, α-tocopherol suppressed the formation of DLPC hydroperoxides until all the α-tocopherol had been depleted. The oxidation products of α-tocopherol were 8a-alkyldioxy-α-tocopherones, 5, 6-epoxy-α-tocopherylquinone, 2, 3-epoxy-α-tocopherylquinone, and α-tocopherylquinone. The 8a-alkyldioxy-α-tocopherones were decomposed in the liposomes primarily by being hydrolyzed to produce α-tocopherylquinone. The results indicate that α-tocopherol can trap peroxyl radicals to form 8a-alkyldioxy-α-tocopherones which are hydrolyzed to α-tocopherylquinone in phospholipid bilayers. In another oxidation pathway, α-tocopherol may be oxidized by peroxyl radicals to form isomeric epoxy-α-tocopherylquinones.
Journal
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- Bioscience, Biotechnology, and Biochemistry
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Bioscience, Biotechnology, and Biochemistry 60 (4), 616-620, 1996
Japan Society for Bioscience, Biotechnology, and Agrochemistry
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Keywords
Details 詳細情報について
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- CRID
- 1390001206475173120
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- NII Article ID
- 110002678079
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- NII Book ID
- AA10824164
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- COI
- 1:CAS:528:DyaK28Xislahs78%3D
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- ISSN
- 13476947
- 09168451
- http://id.crossref.org/issn/09168451
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- PubMed
- 8829527
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed