STUDIES ON BIO-ANTIOXIDANTS——MICELLAR EFFECTS ON THE REDUCTION OF NITROXIDES BY VITAMIN C |
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引用本文: | 刘有成,韩正旭,吴隆民,陈平,刘中立.STUDIES ON BIO-ANTIOXIDANTS——MICELLAR EFFECTS ON THE REDUCTION OF NITROXIDES BY VITAMIN C[J].中国科学B辑(英文版),1989(8). |
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作者姓名: | 刘有成 韩正旭 吴隆民 陈平 刘中立 |
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作者单位: | Department of Chemistry,Lanzhou,University,Department of Chemistry,Lanzhou,University,Department of Chemistry,Lanzhou,University,Department of Chemistry,Lanzhou,University,Department of Chemistry,Lanzhou,University |
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基金项目: | the National Natural Science Foundation of China. |
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摘 要: | The kinetics of reduction of nitroxides including 4-hydroxy-TEMPO, 4-methoxy-TEMPOand 4-hexanoyloxy-TEMPO, which are of different lipophilicities, by vitamin C in cationic,non-ionic and anionic micelles, i. e. CTAB, Triton X-100 and SDS, respectively, have beenstudied by ESR spectroscopy by a stopped-flow technique. A mechanism for the reactionconducted in micelles is proposed and the rate constants for the elementary reactions areevaluated. It is found that the rates of single electron transfer reactions involving the ni-troxides are dependent on the nature of the micelle and the lipophilicity of the nitroxide.The rates are increased in CTAB, decreased in SDS, whereas unaffected in Triton X-100.And the greater the lipophilicity of the nitroxide, the more pronounced the rate variation.As high as a 3600-fold increase in the rate was observed for 4-hexanoyloxy-TEMPO in CTABover that in SDS. The micellar effects are rationalized on the basis of analysis of parame-ters and line shape of the ESR spectra for
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