Coordination complexes derived thiosemicarbazone ligands were designed to exhibit the potential factors to influence the molecular packing. The aromatic group 4,5 diazafluorene can form strong hydrogen bonds with the ...Coordination complexes derived thiosemicarbazone ligands were designed to exhibit the potential factors to influence the molecular packing. The aromatic group 4,5 diazafluorene can form strong hydrogen bonds with the lattice water molecules from which connect the molecules aggregating into a one dimensional screw chain. It seems that the existence of those hydrogen bonds is essential for the molecules crystallized in noncentral space group and exhibiting obviously SHG efficiency.展开更多
目的制备巯嘌呤/维拉帕米-介孔氧化硅释药系统并评价其逆转耐药作用。方法采用共缩聚法合成介孔氧化硅纳米粒并载药,制备巯嘌呤/维拉帕米-介孔氧化硅释药系统;动态透析法研究该释药系统的体外释药特性;噻唑蓝比色法(MTT法)评价该释药系...目的制备巯嘌呤/维拉帕米-介孔氧化硅释药系统并评价其逆转耐药作用。方法采用共缩聚法合成介孔氧化硅纳米粒并载药,制备巯嘌呤/维拉帕米-介孔氧化硅释药系统;动态透析法研究该释药系统的体外释药特性;噻唑蓝比色法(MTT法)评价该释药系统的逆转耐药作用及可能机制。结果所制备释药系统的粒径在170~250 nm左右,Zeta电位在-30 m V^-40 m V,微观形态呈球形,均匀分布,具有规则介孔孔道。体外释放显示维拉帕米缓慢释放,6-巯嘌呤加入诱导剂之前无释放,加入诱导剂后释药过程呈现先突释后缓释。MTT法检测显示所制备释药系统与阳性药维拉帕米及同浓度物理混合物相比,具有显著逆转耐药作用。结论所制备的巯嘌呤/维拉帕米-介孔氧化硅释药系统有较好的抗肿瘤活性及逆转耐药作用。展开更多
文摘Coordination complexes derived thiosemicarbazone ligands were designed to exhibit the potential factors to influence the molecular packing. The aromatic group 4,5 diazafluorene can form strong hydrogen bonds with the lattice water molecules from which connect the molecules aggregating into a one dimensional screw chain. It seems that the existence of those hydrogen bonds is essential for the molecules crystallized in noncentral space group and exhibiting obviously SHG efficiency.
文摘目的制备巯嘌呤/维拉帕米-介孔氧化硅释药系统并评价其逆转耐药作用。方法采用共缩聚法合成介孔氧化硅纳米粒并载药,制备巯嘌呤/维拉帕米-介孔氧化硅释药系统;动态透析法研究该释药系统的体外释药特性;噻唑蓝比色法(MTT法)评价该释药系统的逆转耐药作用及可能机制。结果所制备释药系统的粒径在170~250 nm左右,Zeta电位在-30 m V^-40 m V,微观形态呈球形,均匀分布,具有规则介孔孔道。体外释放显示维拉帕米缓慢释放,6-巯嘌呤加入诱导剂之前无释放,加入诱导剂后释药过程呈现先突释后缓释。MTT法检测显示所制备释药系统与阳性药维拉帕米及同浓度物理混合物相比,具有显著逆转耐药作用。结论所制备的巯嘌呤/维拉帕米-介孔氧化硅释药系统有较好的抗肿瘤活性及逆转耐药作用。