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Citation: Chu Gao-Sheng, Zhang Shu-Juan, Yao Si-De, Dou Da-Ying, Zhang Zhi-Cheng. Solvent Effects on the Oxidation of TyrOH by SO4●－ Radical[J]. Acta Physico-Chimica Sinica, ;2002, 18(09): 812-816. doi: 10.3866/PKU.WHXB20020909 shu

Solvent Effects on the Oxidation of TyrOH by SO4●－ Radical

1.
Department of Applied Chemistry, University of Science and Technology of China, Hefei　230026; Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, P.O.Box 800-204,Shanghai　201800

Received Date: 23 November 2001
Available Online: 15 September 2002

This work presents the study on the oxidation of TyrOH by SO4●－ in water/ACN mixed media. Investigations show that the reaction mechanism between TyrOH and SO4●－ does not change by the addition of ACN, whereas the kinetic behavior of the transient species produced is significantly affected. The decay of SO4●－ decelerates with increasing volume fraction of ACN in mixed media whereas the decay of TyrO● accelerates. We suggest that the contrary effects of the solvent on the decay of both SO4●－ and TyrO● are due to their different charges. The deceleration of the oxidation of TyrOH by SO4●－ with the increase of ACN fraction may demonstrate that in the presence of organic solvents the redox potential of TyrO●/TyrOH is altered, which provides support for the suggestion that the redox potential of TyrO●/ TyrOH might be altered with their inclusion into peptides and proteins.
- TyrOH;SO4●－ radical;Redox potential;Solvent effect;Acetonitrile(ACN)
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