| Characterization of transient species in laser photolysis of aromatic amino acids using acetone as photosensitizer |
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| 作者姓名： | 宋钦华 徐业平 俞书勤 陈从香 马兴孝 王文锋 姚思德 林念芸 |
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| 作者单位： | SONG Qinhua，XU Yeping，YU Shuqin
CHEN Congxiang，MA Xingxiao
(Department of Chemical Physics，University of Science and Technology of China，Hefei 230026，China)
WANG Wenfeng，YAO Side ) and LIN Nianyun
(Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China) |
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| 基金项目： | Project supported by the China Postdoctoral Science Foundation. |
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| 摘 要： | The photochemical processes of aromatic amino acids were investigated in aqueous solution using acetone as photosensitizer by KrF (248 nm) laser flash photolysis. Laser-induced transient species were characterized according to kinetic analysis and quenching experiments. The intermediates recorded were assigned to the excited triplet state of tryptophan, the radicals of tryptophan and tyrosine. The excited triplet state of tryptophan produced via a triplet-triplet excitation transfer and the radicals arising from electron transfer reaction has been identified. Neither electron transfer nor energy transfer between triplet acetone and phenylalanine can occur in photolysis of phenylalanine aqueous solution which contains acetone. Furthermore, triplet acetone-induced radical transformation: Trp/N-Tyr→Trp-Tyr/O was observed directly in photolysis of dipeptide (Trp-Tyr) aqueous solution containing acetone, and the transformation resulting from intramolecular electron transfer was suggested.
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| 收稿时间： | 21 December 1998 |
Characterization of transient species in laser photolysis of aromatic amino acids using acetone as photosensitizer |
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| Qinhua Song,Yeping Xu,Shuqin Yu,Congxiang Chen,Xingxiao Ma,Wenfeng Wang,Side Yao,Nianyun Lin.Characterization of transient species in laser photolysis of aromatic amino acids using acetone as photosensitizer[J].Science in China(Chemistry),1999,42(6):561-566. |
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| Authors: | Qinhua Song Yeping Xu Shuqin Yu Congxiang Chen Xingxiao Ma Wenfeng Wang Side Yao Nianyun Lin |
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| Institution: | (1) Department of Chemical Physics, University of Science and Technology of China, 230026 Hefei, China;(2) Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, 201800 Shanghai, China |
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| Abstract: | The photochemical processes of aromatic amino acids were investigated in aqueous solution using acetone as photosensitizer
by KrF (248 nm) laser flash photolysis. Laser-induced transient species were characterized according to kinetic analysis and
quenching experiments. The intermediates recorded were assigned to the excited triplet state of tryptophan, the radicals of
tryptophan and tyrosine. The excited triplet state of tryptophan produced via a triplet-triplet excitation transfer and the
radicals arising from electron transfer reaction has been identified. Neither electron transfer nor energy transfer between
triplet acetone and phenylalanine can occur in photolysis of phenylalanine aqueous solution which contains acetone. Furthermore,
triplet acetone-induced radical transformation: Trp/N *-Tyr+Trp-Tyr/O* was observed directly in photolysis of dipeptide (Trp-Tyr) aqueous solution containing acetone, and the transformation
resulting from intramolecular electron transfer was suggested.
Project supported by the China Postdoctoral Science Foundation. |
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| Keywords: | aromatic amino acid laser flash photolysis transient species electron transfer |
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