caa a22 4500 475782666 CHVBK 20180406123649.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1008949428203 doi (NATIONALLICENCE)springer-10.1023/A:1008949428203 Chemical transformation of some biologically relevant calcium phosphates in aqueous media during a steam sterilization [Elektronische Daten] [S. Dorozhkin, M. Schmitt, J. Bouler, G. Daculsi] The purpose of this study was to investigate the effect of steam sterilization on some biologically relevant calcium phosphates: CaHPO4· 2H2O (DCPD), calcium deficient apatite (CDA) and biphasic calcium phosphate (BCP). Suspensions of 0.2 g of each calcium phosphate compound with 5.0 ml of deionized water were prepared and steam sterilized in an autoclave (20 min at 121 °C). After sterilization the suspensions were filtered and the dried solids characterized with scanning electron microscopy, IR-spectroscopy and X-ray diffraction. The pH and calcium concentrations of the filtrates were determined with ion selective electrodes. Similar measurements were made with the same samples which were not sterilized. The sterilization procedure was found to result in the dehydration of DCPD and hydration of calcium oxide incorporated into the BCP. Solution pH was observed to change from 7.3 to 5.5 for the solutions in equilibrium with DCPD and from 8.5 to 10.6 for those in equilibrium with BCP. Minor changes both with the solid and liquid phases were found to occur during the steam sterilization of CDA. These results indicate that steam sterilization may have different effects on different calcium phosphate suspensions: it can result in dehydration of DCPD, fast hydration for CaO in BCP, but no significant effect on CDA. Kluwer Academic Publishers, 2000 Dorozhkin S. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut Schmitt M. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut Bouler J. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut Daculsi G. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/12(2000-12-01), 779-786 0957-4530 11:12<779 2000 11 10856 https://doi.org/10.1023/A:1008949428203 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008949428203 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dorozhkin S. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut NATIONALLICENCE 700 1- Schmitt M. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut NATIONALLICENCE 700 1- Bouler J. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut NATIONALLICENCE 700 1- Daculsi G. center de Recherche sur les Mate´riaux d'Inte´re^t Biologique, UPRES EA 2159, Faculte´ de Chirurgie Dentaire, BP 84215, 44042, Nantes Cedex 1, France aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/12(2000-12-01), 779-786 0957-4530 11:12<779 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer