目的寻找一种新型光动力学疗法光敏剂。方法采用从光合细菌中分离纯化的脱镁细菌叶绿素为配体,与金属盐在有机溶剂中反应,合成了Cu,Zn,Co,N i 4种金属细菌叶绿素,并对其紫外可见光谱和荧光光谱进行研究。此外还研究了4种金属细菌叶绿素...目的寻找一种新型光动力学疗法光敏剂。方法采用从光合细菌中分离纯化的脱镁细菌叶绿素为配体,与金属盐在有机溶剂中反应,合成了Cu,Zn,Co,N i 4种金属细菌叶绿素,并对其紫外可见光谱和荧光光谱进行研究。此外还研究了4种金属细菌叶绿素对K562和HL60两种白血病细胞生长的影响。结果4种金属细菌叶绿素的光谱图都有可预见的漂移,证明金属已配位到细菌叶绿素的卟啉大环上。同时,4种金属细菌叶绿素都有很强的抑瘤作用,光照可以明显提高其抑瘤率。结论金属细菌叶绿素作为一种新型光敏剂具有优良的性质,是新一代光敏剂发展的一个方向。展开更多
The function of protein in long-range biological electron transfer is a question of debate. We report some preliminary results in femtosecond spectroscopic study of photosynthetic bacterial light-harvesting antenna co...The function of protein in long-range biological electron transfer is a question of debate. We report some preliminary results in femtosecond spectroscopic study of photosynthetic bacterial light-harvesting antenna complex assembled onto TiO2 nanoparticle with an average size of 8 nm in diameter. Crystal structure shows that photosynthetic bacterial antenna complex LH2 has a ring-like structure composed by alpha- and beta-apoprotein helices. The alpha- and beta-transmembrance helices construct two concentric cylinders with pigments bacteriochlorophyll a (Bchl a) and carotenoid (Car) buried inside the protein. We attempt to insert TiO2 nanoparticle into the cavity of the inner cylindrical hollow of LH2 to investigate the nature of the electron transfer between the excited-state Bchl a and the TiO2 nanoparticle. A significant decrease in the ground state bleaching recovery time constant for Bchl a at 850 run (B850) in respect to that of the Bchl a in free LH2 has been observed. By using the relation of distance-dependent long-range electron transfer rate in protein, the distance between the donor B850 and the acceptor TiO2 nanoparticle has been estimated, which is about 0.6 nm. The proposed method of assembling proteins onto wide-gap semiconductor nanoparticle can be a promising way to determine the role of the protein playing in biological electron transfer processes.展开更多
文摘目的寻找一种新型光动力学疗法光敏剂。方法采用从光合细菌中分离纯化的脱镁细菌叶绿素为配体,与金属盐在有机溶剂中反应,合成了Cu,Zn,Co,N i 4种金属细菌叶绿素,并对其紫外可见光谱和荧光光谱进行研究。此外还研究了4种金属细菌叶绿素对K562和HL60两种白血病细胞生长的影响。结果4种金属细菌叶绿素的光谱图都有可预见的漂移,证明金属已配位到细菌叶绿素的卟啉大环上。同时,4种金属细菌叶绿素都有很强的抑瘤作用,光照可以明显提高其抑瘤率。结论金属细菌叶绿素作为一种新型光敏剂具有优良的性质,是新一代光敏剂发展的一个方向。
文摘The function of protein in long-range biological electron transfer is a question of debate. We report some preliminary results in femtosecond spectroscopic study of photosynthetic bacterial light-harvesting antenna complex assembled onto TiO2 nanoparticle with an average size of 8 nm in diameter. Crystal structure shows that photosynthetic bacterial antenna complex LH2 has a ring-like structure composed by alpha- and beta-apoprotein helices. The alpha- and beta-transmembrance helices construct two concentric cylinders with pigments bacteriochlorophyll a (Bchl a) and carotenoid (Car) buried inside the protein. We attempt to insert TiO2 nanoparticle into the cavity of the inner cylindrical hollow of LH2 to investigate the nature of the electron transfer between the excited-state Bchl a and the TiO2 nanoparticle. A significant decrease in the ground state bleaching recovery time constant for Bchl a at 850 run (B850) in respect to that of the Bchl a in free LH2 has been observed. By using the relation of distance-dependent long-range electron transfer rate in protein, the distance between the donor B850 and the acceptor TiO2 nanoparticle has been estimated, which is about 0.6 nm. The proposed method of assembling proteins onto wide-gap semiconductor nanoparticle can be a promising way to determine the role of the protein playing in biological electron transfer processes.
