| 维生素K3的激发三重态与色氨酸、酪氨酸电子转移氧化反应的激光闪光光解研究 |
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| 引用本文： | 唐睿智,李海霞,刘艳成,张鹏,曹西艳,王文锋. 维生素K3的激发三重态与色氨酸、酪氨酸电子转移氧化反应的激光闪光光解研究[J]. 物理化学学报, 2012, 28(1): 213-216. DOI: 10.3866/PKU.WHXB201228213 |
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| 作者姓名： | 唐睿智 李海霞 刘艳成 张鹏 曹西艳 王文锋 |
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| 作者单位： | 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan Province, P. R. China |
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| 基金项目： | supported by the National Natural Science Foundation of China(21173252)~~ |
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| 摘 要： | 利用时间分辨的激光闪光光解技术研究了乙腈-水混合溶液(1:1,V/V)中2-甲基萘醌(通常称为维生素K3)的激发三重态对色氨酸、酪氨酸的光敏氧化机理.通过瞬态吸收光谱的变化可以推断维生素K3的激发三重态可以与色氨酸、酪氨酸发生电子转移反应,反应形成的维生素K3阴离子自由基的吸收峰可以直接从瞬态吸收谱图中观察到.维生素K3与色氨酸、酪氨酸的电子转移反应的速率分别为1.1×109和0.6×109L·mol-1·s-1.吉布斯自由能(ΔG)的计算结果表明维生素K3的激发三重态与色氨酸、酪氨酸电子转移反应在热力学上是可行的.
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| 关 键 词： | 维生素K3 色氨酸 酪氨酸 激光闪光光解 |
| 收稿时间： | 2011-09-07 |
| 修稿时间： | 2011-10-31 |
Laser Flash Photolysis Study on Electron Transfer Oxidation Reaction of Tryptophan or Tyrosine with Triplet State Vitamin K3 |
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| TANG Rui-Zhi , LI Hai-Xia , LIU Yan-Cheng , ZHANG Peng , CAO Xi-Yan , WANG Wen-Feng. Laser Flash Photolysis Study on Electron Transfer Oxidation Reaction of Tryptophan or Tyrosine with Triplet State Vitamin K3[J]. Acta Physico-Chimica Sinica, 2012, 28(1): 213-216. DOI: 10.3866/PKU.WHXB201228213 |
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| Authors: | TANG Rui-Zhi LI Hai-Xia LIU Yan-Cheng ZHANG Peng CAO Xi-Yan WANG Wen-Feng |
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| Affiliation: | 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan Province, P. R. China |
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| Abstract: | Laser flash photolysis was used to study the photosensitized oxidation mechanism of vitamin K3,commonly known as 2-methyl-1,4-naphthoquinone (MQ),with tryptophan (TrpH) or tyrosine (TyrOH) in acetonitrile/water (1:1,V/V) solution.The triplet state of MQ reacted with TrpH or TyrOH by electron transfer with the formation of a MQ anion radical,which was directly observed in the transient absorption spectrum.The rate constants of the electron transfer reactions were determined to be 1.1×109 and 0.6×109 L·mol-1·s-1 for TrpH and TyrOH,respectively.The free energy changes (ΔG) of the reactions showed that the proposed electron transfer steps are thermodynamically feasible. |
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| Keywords: | Vitamin K3 Tryptophan Tyrosine Laser flashphotolysis |
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