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Effects of amino acids on conversion of calcium carbonate to hydroxyapatite

机译：氨基酸对碳酸钙转化为羟基磷灰石的影响

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Conversion of calcium carbonate (calcite; CC) to hydroxyapatite (HAp) was examined when the CC particles of sub μm size were soaked at 37 °C for up to 10 d in 0.15 M K _(2) HPO _(4) (20 ml), whose pH was set to 3–12. Here, the solution contained amino acids, such as glutamine (Glu), arginine (Arg), and glycine (Gly), and their content varied from 0–1.0 g per ml of solution. From the X-ray diffraction (XRD) intensity of the 104 and 211 diffractions of calcite and apatite, respectively, it was seen that the presence of the amino acids promoted the conversion. This was supported by the thermogravimetry (TG) results. The highest promotion was observed at 0.5 g addition of amino acids to the phosphate solution, while Glu showed the highest promotion among the amino acids and Gly the lowest. A scanning electron microscopy study indicated that petal-like HAp nano-crystallites covered the entire surface of the CC particles when they were soaked in the phosphate solution with 0.1 g or more of amino acid for 10 d. The XRD intensity ratio 104(CC)/211(HAp) indicated greater CC to HAp conversion in the solutions at pH 3 and 6 than in the more alkaline solutions. This was attributed to the dissolution of CC in the acidic solutions, which was confirmed by bubbling in these solutions.
机译：当亚μm尺寸的CC颗粒在37℃下在0.15 mk _（2）HPO _（4）中，检查碳酸钙（方解石; CC）至羟基磷灰石（HAP）〜10d时，检查碳酸钙（方解石; CC）对羟基磷灰石（HAP）。（2）HPO _（4）（20mL ），其pH设定为3-12。这里，该溶液含有氨基酸，例如谷氨酰胺（Glu），精氨酸（Arg）和甘氨酸（Gly），它们的含量从0-1.0g / ml溶液变化。从方解石和磷灰石的104和211衍射的X射线衍射（XRD）强度分别看出，氨基酸的存在促进了转化率。这是由热重率（TG）结果支持的。在向磷酸溶液中加入0.5g加入氨基酸的促进剂，而Glu在氨基酸和最低最低的促进剂中显示出最高的促进。扫描电子显微镜研究表明，当它们在磷酸盐溶液中浸泡在磷酸盐溶液中时，花瓣状Hap纳米微晶覆盖在磷酸盐溶液中的氨基酸10 d中的氨基酸。 XRD强度比104（CC）/ 211（HAP）表明在pH 3和6的溶液中的溶液中的CC更大，而不是更碱性溶液。这归因于CC在酸性溶液中的溶解，通过在这些溶液中鼓泡来证实。

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