Abstract
The influence of gelatin on the formation, stability and transformation of amorphous calcium phosphate, ACP, at 298 K and initial pH 7.4 was investigated. Precipitation of ACP was brought about from equimolar solutions (3×10 −3 mol dm −3) of calcium chloride and sodium phosphate while the concentration of gelatin varied from 0.0001 to 1.12 g dm −3. The interaction between gelatin and ACP was characterized by particle electrophoretic mobility, pH and turbidity measurements. The ACP electrophoretic mobility during the precipitation in the presence of gelatin indicated gelatin adsorption onto ACP as the dominating interaction mode. By adsorbing on the surface of primary particles gelatin slows down or even prevents ACP aggregation thus stabilizing its colloidal state. Besides, the presence of gelatin promotes the transformation of ACP into a crystalline phase.
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