| 丙酮三重态与含芳香氨基酸肽的物理化学过程 |
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| 引用本文： | 宋钦华,储高升,林维真,姚思德. 丙酮三重态与含芳香氨基酸肽的物理化学过程[J]. 高等学校化学学报, 2000, 21(12): 1880-1883 |
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| 作者姓名： | 宋钦华 储高升 林维真 姚思德 |
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| 作者单位： | 1. 中国科学技术大学化学系, 合肥 230026;2. 中国科学技术大学应用化学系, 合肥 230026;3. 中国科学院上海原子核研究所辐射化学开放实验室, 上海 201800 |
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| 基金项目： | 国家自然科学基金! (批准号 :980 3 0 0 3 6)，中国科技大学青年基金资助 |
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| 摘 要： | 用激光闪光光解瞬态吸收光谱研究了水溶液中含芳香氨基酸残基肽的光敏化反应过程.结果表明,在丙酮存在的含色氨酸残基肽(Trp-Gly,n-f-Met-Trp,Trp-Phe)体系的光解,丙酮三重态与Trp分别通过三重态-三重态(T-T)激发能转移和电子转移生成Trp激发三重态和N中心自由基(Trp/N·);丙酮三重态仅与含酪氨酸残基肽(Phe-Tyr)通过电子转移生成Tyr酚氧自由基(Tyr/O·).在色氨酰酪氨酸(Trp-Tyr)与丙酮的光解体系中,观察到分子内的电子转移,即由Trp/N·-Tyr→Trp-Tyr/O·自由基的生成过程
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| 关 键 词： | 含芳香氨基酸的肽 激光闪光光解 电子转移 |
| 收稿时间： | 1999-08-11 |
Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides |
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| SONG Qin-Hua,CHU Gao-Sheng,LIN WeiZhen,YAO SiDe. Physical Chemical Processes of Acetone Triplet with Aromatic Amino Acid-containing Peptides[J]. Chemical Research In Chinese Universities, 2000, 21(12): 1880-1883 |
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| Authors: | SONG Qin-Hua CHU Gao-Sheng LIN WeiZhen YAO SiDe |
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| Affiliation: | 1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;2. Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China;3. Laboratoryof Radiation Chemistry, Shanghai Instituteof Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China |
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| Abstract: | The photochemical processes of triplet acetone with aromatic amino acid containing peptides were investigated in neutral aqueous solution using KrF(248 nm) laser flash photolysis.In the presence of acetone, the formation of excited triplet states of tryptophan residues and radicals(Trp/N·) via a-triplet-triplet( T-T ) energy transfer and an electron transfer respectively, was observed in case of Trp Phe, Trp Gly and n-formyl-Met-Trp, while only phenolic hydroxy radical(Tyr/O·), via an electron transfer, was observed in case of Phe Tyr.Furthermore, triplet acetone induced radical transformation: Trp/N· Tyr→-Trp Tyr/O· was observed directly, and the transformation resulting from intramolecular electron transfer was suggested |
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| Keywords: | Aromatic amino acid containing peptide Laser flash photolysis Electron transfer |
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