卵磷脂-水体系中草酸钙模拟生物矿化的研究  

The Study of Mimetic Biomineralization of Calcium Oxalate in PC H2O System

作　　者：李霞[1] 姚松年[1] 

机构地区：[1]武汉大学化学与分子科学学院分析测试中心,武汉430072

出　　处：《无机化学学报》2002年第4期421-426,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.29473113)。

摘　　要：In this paper, the mimetic biomineralization of CaC2O4 in lecithin water(PC H2O) ordered systems has been discussed. First, the effect of the aggregation state of PC aqueous solutions on the crystal structure of CaC2O4 has been studied. In all experiments, the only precipitated crystal forms obtained are calcium oxalate monohydrate(COM) and calcium oxalate dihydrate(COD). It have been shown that the relative amount of COD in PC H2O systems is much higher than that of in H2O system, and furthermore the aggregation state of PC influences the composition of coprecipitations to some extent. When PC distributing in aqueous solution as single molecules, it acts as inhibitor of COM , and then favors the formation of COD. While PC in micelle existence, the relative amount of COM increases , but is still lower than that of in H2O system . And when PC aggregates as vesicles, COD forms predominantly. Second, the morphology of CaC2O4 obtained in different reaction systems under different conditions has been also investigated. In H2O system, we observed thin, plate like crystals with serrated edges underISL(low ionic strength) condition and oriented clusters under ISH(high ionic strength) condition. Crystals with two layers arrangement were obtained in micelleordered PC H2O system under ISL condition. And in vesicle ordered PC H2O system, clusters with butterfly like shape were observed. The results obtained revealed a complex dependence of calcium oxalate formation,crystal growth, structure and morphology on the aggregation state of PC H2O systems.In this paper, the mimetic biomineralization of CaC2O4 in lecithin water(PC H2O) ordered systems has been discussed. First, the effect of the aggregation state of PC aqueous solutions on the crystal structure of CaC2O4 has been studied. In all experiments, the only precipitated crystal forms obtained are calcium oxalate monohydrate(COM) and calcium oxalate dihydrate(COD). It have been shown that the relative amount of COD in PC H2O systems is much higher than that of in H2O system, and furthermore the aggregation state of PC influences the composition of coprecipitations to some extent. When PC distributing in aqueous solution as single molecules, it acts as inhibitor of COM , and then favors the formation of COD. While PC in micelle existence, the relative amount of COM increases , but is still lower than that of in H2O system . And when PC aggregates as vesicles, COD forms predominantly. Second, the morphology of CaC2O4 obtained in different reaction systems under different conditions has been also investigated. In H2O system, we observed thin, plate like crystals with serrated edges underISL(low ionic strength) condition and oriented clusters under ISH(high ionic strength) condition. Crystals with two layers arrangement were obtained in micelleordered PC H2O system under ISL condition. And in vesicle ordered PC H2O system, clusters with butterfly like shape were observed. The results obtained revealed a complex dependence of calcium oxalate formation,crystal growth, structure and morphology on the aggregation state of PC H2O systems.

关 键 词：卵磷脂 草酸钙 一水草酸钙 二水草酸钙 生物矿化 模拟 表面活性剂 结晶 

分 类 号：TQ262.2[化学工程—有机化工]