抄録
Adsorption of glycine on amorphous calcium phosphate and its thermal stability were investigated by the reactions in an aqueous solution of CaCl2-K2HPO4-C2H5O2N-KOH system. Characterization of the products was determined by means of X-ray diffraction, thermal analysis (TG-DTA), infrared absorption spectrometry and ion chromatography. The largest quantity of glycine adsorbed on amorphous calcium phosphate having Ca/P atomic ratio of 1.65 was 8.5 mass% when it is synthesized under the conditions of temperature at 0°C, initial pH 10.0 and C2H5O2N /CaCl2 molar ratio 11.0, and then aged at 40°C. It was proved that the glycine as one of the amino acids was more tightly adsorbed on the surface of amorphous calcium phosphate than on HAp. The glycine adsorbed on amorphous calcium phosphate was started decomposition at above 200°C, was finished at 600°C, and amorphous calcium phosphate was then transformed to α-type tricalcium phosphate at around 660°C.
