采用扫描电子显微镜(SEM)和X射线衍射(XRD)在凝胶体系中研究了不同结构氨羧钾对草酸钙(CaOxa)结晶的影响,这些氨羧钾包括氨基乙酸钾(KGLY)、乙二醇二乙醚二胺四乙酸二钾(K2EGTA)、氨基三乙酸二钾(K2NTA)、二乙三胺五乙酸二钾(K2DTPA)、乙二胺四乙酸二钾(K2EDTA)和环已二胺四乙酸二钾(K2CDTA).这些物质均能诱导二水草酸钙(COD)形成,抑制一水草酸钙(COM)聚集和减小COM的比表面积,其诱导COD能力依次为:K2DTPA(55wt%)>K2EDTA≈K2CDTA(50wt%)>K2NTA(43wt%)>>K2EGTA(4wt%)>KGLY(2wt%),抑制COM聚集的能力依次为:K2DTPA>K2NTA>K2CDTA≈K2EDTA>K2EGTA>KGLY.从氨羧盐的分子结构、羧基的相对含量、羧基的空间位置、与钙离子的配位能力及其配位方式等角度讨论了其抑制COM聚集和诱导COD形成的化学基础.结果表明K2NTA和K2DTPA有可能成为防止草酸钙结石形成的潜在药物.
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