Doped calcium carbonate-phosphate is a biocompatible material that influence actively on the osteogenesis, bone regenerate, strengthening of bone and dental tissues including through the skin. A mechanism of the synthesis reactions of doped nanocrystalline calcium carbonate-phosphate an oscillating type of model for these reactions is proposed. The results indicate that the synthesis involves the formation of hydroxy carbonate complexes from the three calcium carbonate polymorphs (calcite, vaterite, and aragonite) in a solution of ammonium chloride and ammonium carbonate, followed by reaction with orthophosphoric acid. The formation of nanocrystalline calcium carbonate-phosphate doped with Fe<sup>2+</sup>, Mg<sup>2+</sup>, Zn<sup>2+</sup>, K<sup>+</sup>, Si<sup>4+</sup>, and Mn<sup>2+</sup>, has been studied by X-ray diffraction, IR spectroscopy, differential thermal analysis, and energy dispersive X-ray fluorescence analysis. This ensures the preparation of a bioactive material based on octacalcium hydrogen phosphate, and calcium chloride hydroxide phosphates containing cation vacancies. Particle-size analysis data show that the materials contain nanoparticles down to 10 nm in size. Heat treatment of the doped calcium carbonate phosphates produces calcium hydroxyapatite containing cation vacancies, which can be used as a bioactive ceramic
Silicon glycerolates of the general formula Si(C 3 H 7 O 3 ) 4 × xC 3 H 8 O 3 (3 £ x £ 10) and related hydrogels of the general formula Si(C 3 H 7 O 3 ) 4 × xC 3 H 8 O 3 × yH 2 O (3 £ x £ 10, 20 £ y £ 40) were synthesized and some of their pharmacological properties were studied. The laws of gel formation were investigated and optimum conditions for the process were determined. High percutaneous (transdermal) activity of the synthesized compounds was revealed by measuring the diffusion of drugs through intact skin membrane in vitro. The acute and chronic toxicity was studied. It was established that all substances are nontoxic. The experimental results show that silicon glycerolates and related hydrogels can be recommended for further testing and investigation as effective biologically active percutaneous vehicles of medicinal preparations.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.