Reactions of 2,2'-Azinobis-(3-ethylbenzthiazoline-6-sulfonate) Dianion, ABTS2-, with OH, (SCN)2
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- 作者：Jerzy L. G<img src="http ; //pubs.acs.org/images/entities/ecedil.gif" border="0">bicki ; Magdalena Maciejewska
- 刊名：Journal of Physical Chemistry A
- 出版年：2007
- 出版时间：March 22, 2007
- 年：2007
- 卷：111
- 期：11
- 页码：2122 - 2127
- 全文大小：103K
- 年卷期：v.111,no.11(March 22, 2007)
- ISSN：1520-5215
文摘
ABTS2-, 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulfonate) dianion, was used as a reference to compare thereactivity of peroxyl radicals of two amino acids, glycine and valine, in aqueous solutions at natural pH.Peroxyl radicals were produced by pulse radiolysis and the product of their reaction with ABTS2- the ABTS<IMG SRC="/images/entities/bull.gif">-radical was observed spectrophotometrically. Experimental kinetic traces were fitted using chemical simulation.The rate constants of reactions of glycine and valine peroxyl radicals with ABTS2- were (6.0 ± 0.2) × 106and (1.3 ± 0.1) × 105 M-1·s-1, respectively. Moreover, it was found that only 60% of glycine radicalsformed upon its reaction with 
bull.gif">OH radicals reacted with molecular oxygen to yield peroxyl radicals. Comparisonof experimental data with simulations of chemical reactions in irradiated ABTS and ABTS/NaSCN solutionsshowed that ABTSbull.gif">- forms in the reaction with bull.gif">OH with a yield of 43% and rate constant of (5.4 ± 0.2) ×109 M-1·s-1 and in the reaction with (SCN)2bull.gif">- with a yield of 57% and rate constant of (8.0 ± 0.2) × 108M-1·s-1.
bull.gif">OH radicals reacted with molecular oxygen to yield peroxyl radicals. Comparisonof experimental data with simulations of chemical reactions in irradiated ABTS and ABTS/NaSCN solutionsshowed that ABTSbull.gif">- forms in the reaction with bull.gif">OH with a yield of 43% and rate constant of (5.4 ± 0.2) ×109 M-1·s-1 and in the reaction with (SCN)2bull.gif">- with a yield of 57% and rate constant of (8.0 ± 0.2) × 108M-1·s-1.