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激光诱导萘醌激发三重态猝灭反应的TR-ESR研究

, PP. 271-277

Keywords: 光谱,萘醌,TEMPO,维生素C,时间分辨电子自旋共振

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Abstract:

利用时间分辨电子自旋共振(TR-ESR)方法,研究了稳定自由基TEMPO和生物抗氧化剂维生素C(VC)对萘醌(NQ)激发三重态的猝灭机理和猝灭动力学。光解NQ/EG体系,从EG上抽氢生成萘醌中性自由基和乙二醇碳自由基。当体系中加入稳定自由基TEMPO时,TEMPO对3NQ*有明显的猝灭作用,猝灭速率常数为1.14*106Lmol-1s-1。对于NQ/VC/EG-H2O溶液,3NQ*不仅可以从EG上夺氢,还从VC上夺氢,VC对3NQ*也有明显的猝灭作用,猝灭速率常数为1.11*107Lmol-1s-1。TEMPO和VC对3NQ*的猝灭反应都受扩散控制。

References

[1]  Nishioku Y, Ohara K, Mukai K. Time-resolved EPR investigation on the photoreactions of vitamin K with antioxidant vitamins in micelle systems [J]. J. Phys. Chem. B, 2001, 105(21): 5032-5038
[2]  Parker J E, Slater T F, Willson R L, Direct observation of a free radical interaction between Vitamin E and Vitamin C [J], Nature, 1979, 278: 737-738
[3]  Mukai K, Nishimura M, Kikuchi S, Stopped-flow investigation of the reaction of vitamin C with tocopheroxyl radical in aqueous triton X-100 micellar solutions [J], J. Biol. Chem., 1991: 266(1): 274.
[4]  Bisby R H, Parker A W, Reaction of Ascorbate with the α-Tocopheroxyl Radical in Micellar and Bilayer Membrane Systems [J], Arch. Biochem. Biophys., 1995, 317(1): 170-178
[5]  Zhang Fa, Fang huai, Chen Wei,et al. A ESR study on quinine radical anions formed by the reaction of ascorbic acid with quinones [J]. Chem J Chin Univer. (高等学校化学学报), 1991, 11(5): 540-542 (in Chinese).
[6]  R H Bisby, Parker A W. Reactions of excited triplet duroquinone with α-Tocopherol and Ascorbate: A Nanosecond Laser Flash Photolysis and Time-Resolved Resonance Raman Investigation [J]. J. Am. Chem. Soc., 1995, 117 (21): 5664-5670
[7]  Ohara K, Hashimoto Y, Hamada C, et al. Time-resolved EPR investigation on the photoreactions of vitamin K with antioxidant vitamins in micelle systems [J]. J. Photochem. Photobiol. A: Chem., 2008, 200 (2-3): 239-245
[8]  Lu TongXin, Wei QiZheng, Yu Qishan, et al. 0.2 microsecond time-resolved ESR spectrometer [J]. Chin. J. Scie. Instrum.(仪器仪表学报), 1993, 14(3): 263 -268 (in Chinese).
[9]  Xu Xinsheng, Zhu Guanglai, Hong Xin, et al. A CIDEP study on the photochemical route of duroquinone radicals [J].Chin. J. Atom. Mol. Phys., 2006, 23: 232
[10]  Konkin A L, Roth H K, Schroedner M, et al. Time-resolved ESR studies on transient radicals photogenerated in solutions of melamine in ethylene glycol [J]. Chem. Phys., 2006, 324(2-3), 563-572
[11]  Muus L T, Atkins P W, Mclauchan K A, et al. Chemically induced magnetic polarization [M]. D. Reidel, Dordrecht, Holland, 1977
[12]  Hore P J, Joslin C G, Mclauchan K A. Chemically induced dynamic electron polarization [J].J. Chem. Soc. Spec. Period. Rep. ESR.., 1979, 5(1): 1-45
[13]  Brunmark A, Cadenas E, Redox and addition chemistry of quinoid compounds and its biological implications, Free Radic Bio. Med.,1989, 7(4): 435-477.
[14]  Hao S M, Zhang Z X, Zhu H P, et al. Study on photooxidation damage of lysozyme induced by duroquinone [J].Radiat. Res. Radiat. Process(辐射研究与辐射工艺学报), 2007, 25(3):161-165 (in Chinese)
[15]  Sugimoto R, Kumagai Y, Nakai Y, et al. 9,10-Phenanthraquinone in diesel exhaust particles downregulates Cu,Zn-SOD and HO-1 in human pulmonary epithelial cells: Intracellular iron scavenger 1,10-phenanthroline affords protection against apoptosis, Free Radic Bio. Med., 2005, 38(3): 388–395.
[16]  Chung S W, Chung H Y, Toriba A, et al. An Environmental Quinoid Polycyclic Aromatic Hydrocarbon, Acenaphthenequinone, Modulates Cyclooxygenase-2 Expression through Reactive Oxygen Species Generation and Nuclear Factor Kappa B Activation in A549 Cells, Toxicol. Sci., 2007, 95(2): 348–355
[17]  Sakaguchi Y. Hayashi H. Murai H, et al. CIDEP study of the photochemical reactions of carbonyl compounds showing the external magnetic field effect in a micelle [J]. Chen. Phys. Lett., 1984, 110(3): 275-279
[18]  Ganzuo Li, Jianhai Mu, Xizhong Li, et al. A time-resolved electron spin resonance investigation of the photolysis of 1,4-naphthoquinone in aqueous micellar solutions and microemulsions [J]. Colloid Surf. A, 2001, 194 (1-3) : 263-270
[19]  Zhaoxia Zhang,Shumei Hao, Hongping Zhu.et al. Photoreactions of 1,4-naphthoquinone with lysozyme studied by laser flash photolysis and steady-state analysis [J]. J. Photochem. Photobiol. B, 2008, 92 (2):77-82
[20]  Kawai A, Obi K, A new mechanism of electron spin polarization generation through radical-excited molecule interactions [J], Res. Chem. Intermed., 1993,19(9): 865-894
[21]  Ohara K, Watanabe R, Mizuta Y, et al. Time-resolved electron paramagnetic resonance investigation of photoinitiated antioxidant reaction of Vitamin C (ascorbic acid) with
[22]  xanthone in aqueous sodium lauryl sulfate, hexadecyltrimethyl-ammonium chloride, and Triton X-100 micelle solutions [J], J. Phys. Chem. B, 2003, 107 (41): 11527-11533
[23]  Eveson R W, Mclauchlan K A, Electron spin polarization (CIDEP) studies of the dynamics of geminate free radical reactions, Molecular Phys., 1999, 96(1): 133-142

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