Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (03): 232-237.doi: 10.3866/PKU.WHXB20000308

• ARTICLE • Previous Articles     Next Articles

Laser Flsah Photolysis Study of Cyclic-Phe-His in Aqueous Solution

Chu Gao-Sheng, Song Qin-Hua, Wang Zhong-Yi, Ge Xue-Wu, Zhang Zhi-Cheng, Wang Wen-Feng, Yao Si-De   

  1. Department of Applied Chemistry,Department of Chemistry,University of Science and Technology of China,Hefei 230026|Laboratory of Radiation Chemistry,Shanghai Institute of Nuclear Research,Chinese Academy of Sciences,Shanghai 201800
  • Received:1999-06-04 Revised:1999-10-08 Published:2000-03-15
  • Contact: Chu Gao-Sheng

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Abstract:

Photolysis and photosensition of cyclic-phenylalanine-histidine(cyclic-Phe-His) in aqueous solution were studied using KrF laser flash photolysis (248nm). Photoionization and photodissociation of cyclic-Phe-His in Phe-site occured and the charateristic absorption at 320nm and 410nm have been observed. From changes of the absorption peaks and kinetic analysis, the reaction mechanism of photoionization and photodissociation has been suggested, a series of kinetic parameters have been obtained. Using acetone as a photosensitizer, and N3• as an oxidant by pulse radiolysis method, the induced oxidation of cyclic-Phe-His in aqueous solution has been also reported in this paper, results similar to the photoionization of cyclic-Phe-His have been found.

Key words: Cyclic-phenylalanyl-histidyl(cyclic-Phe-His), Photoionization, Photodissociation, Laser flash photolysis, Pulse radiolysis