摘要
许多生物矿化作用过程都与其不寻常的膜的组成和结构密切相关。作为双亲分子的磷脂,是生物膜的重要组成成分之一。运用以粉末X-射线衍射、扫描电子显微镜和动态光散射技术等实验手段,研究了卵磷脂(PC)和双甘氨肽参与下的碳酸钙矿化过程。结果表明,PC在溶液中形成的脂质体结构,导致了方解石(calcite)表面多孔结构的形成,且其含量的改变,可有效地调控方解石表面孔隙的孔径大小,并在一定程度上促进球霰石(vaterite)的生长和稳定;而PC在溶液表面形成的膜脂层,则通过静电力与双甘氨肽相互作用,有效调控膜脂层下矿物的形成。
Phosphatidylcholine （PC） is one of the basic components of the biomembrane, which plays important roles in the biomineralization. As a double-hydrophilie biomacromoleeule, PC can form liposomes in solution and lipid membrane layer at the interface of solution/air. In this paper, using X-ray diffraction （XRD）, scanning electron microscope （SEM） and dynamic light scattering （DLS）, we systematically investigated mineralization of calcium carbonate in the presence of PC and/or glyeylglyeine by a biomimetie mineralization approach. As a result, we found that phosphatidylcholine and glyeylglyeine obviously have effects on surface mierostrueture of calcium carbonate, and that the electrostatic force interaction between the PC molecules at the interface of solution/air and the dissolved glycylglycine synergically inhibits mineralization of calcium carbonate minerals.
出处
《高校地质学报》
CAS
CSCD
北大核心
2007年第4期644-650,共7页
Geological Journal of China Universities
基金
国家自然基金项目(40672032)资助
关键词
碳酸钙
卵磷脂(PC)
双甘氨肽
生物矿化
calcium carbonate
phosphatidylcholine
glycylglycine
biomineralization
