Photophysical and photochemical processes of riboflavin (vitamin B_2) by means of the transient absorption spectra in aqueous solution  

作　　者：陆长元 韩镇辉 刘官树 蔡喜臣 陈雨玲 姚思德 

出　　处：《Science China Chemistry》2001年第1期39-48,共10页中国科学（化学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 39830090).

摘　　要：Using time-resolved techniques of 337 and 248 nm laser flash photolysis, the photo physical and photochemical processes of riboflavin (RF, vitamin B2) were studied in detail in aqueous solution. The excited triplet state of riboflavin (3RF*) was produced with 337 nm laser, while under 248 nm irradiation, both3RF* and hydrated electron (eaq) formed from photoionization could be detected. Photobiological implications have been inferred on the basis of reactivity of3RF* including energy transfer, electron transfer and hydrogen abstraction. The RF·+ was generated by oxidation of SO4 ·-radical with the aim of confirming the results of photolysis.Using time-resolved techniques of 337 and 248 nm laser flashphotolysis, the photophysical and photochemical processes of riboflavin (RF, vitamin B2) were studied in detail in aqueous solution. The excited triplet state of riboflavin (3RF*) was produced with 337 nm laser, while under 248 nm irradiation, both 3RF* and hydrated electron () formed from photoionization could be detected. Photobiological implications have been inferred on the basis of reactivity of 3RF* including energy transfer, electron transfer and hydrogen abstraction. The RF·+ was gene- rated by oxidation of SO4·- radical with the aim of confirming the results of

关 键 词：riboflavin (RF) laser flash photolysis excited triplet state PHOTOIONIZATION redox reaction 

分 类 号：TQ466[化学工程—制药化工]