Abstract
Composites based on lactic acid oligomers, calcium hydrophosphate and hydroxyapatite synthesized under the action of microwave radiation were obtained in situ. The appearance of a new band associated with stretching vibrations of >C=O in spectra of the chloroform-insoluble fraction is indicative of the chemical interaction between lactic acid and hydroxyapatite. To determine whether a calcium phosphate layer can be formed on the surface of composite samples, biomimetic studies in a physiological SBF solution were carried out during 28 days at 37°C. It was found that all samples containing calcium phosphates promote active formation of a new calcium phosphate layer, whereas lactic acid oligomer in samples containing no inorganic component undergoes destruction in the SBF solution as a result of hydrolysis. The estimate of the resorption rate demonstrated that the solubility of calcium phosphates contained in the composites at 20°C in the physiological solution is 3–7 times that of pure hydroxyapatite.
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Original Russian Text © L.A. Rasskazova, D.N. Lytkina, Ye.G. Shapovalova, V.V. Botvin, M.A. Pozdnyakov, A.G. Filimoshkin, N.M. Korotchenko, V.V. Kozik, 2015, published in Zhurnal Prikladnoi Khimii, 2015, Vol. 88, No. 4, pp. 639–645.
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Rasskazova, L.A., Lytkina, D.N., Shapovalova, Y.G. et al. Bioactive composites produced in situ on the basis of calcium phosphates and lactic acid oligomers. Russ J Appl Chem 88, 669–675 (2015). https://doi.org/10.1134/S1070427215040205
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DOI: https://doi.org/10.1134/S1070427215040205