Photophysical and photochemical processes of riboflavin (vitamin B_2) by means of the transient absorption spectra in aqueous solution |
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Authors: | LU Changyuan HAN Zhenhui LIU GuanshuCAI Xichen CHEN Yuling & YAO SideLaboratory of Radiation Chemistry |
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Institution: | LU Changyuan HAN Zhenhui LIU GuanshuCAI Xichen CHEN Yuling & YAO SideLaboratory of Radiation Chemistry,Shanghai Institute of Nuclear Research,Chinese Academy of Sciences,Shanghai 201800,China |
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Abstract: | 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, both 3RF* and hydrated electron (eaq) formed from photoionizationcould 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 generated by oxidation of SO4.- radical with the aim of confirming the results of photolysis. |
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Keywords: | riboflavin (RF) laser flash photolysis excited triplet state photoionization redox reaction |
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