Results 171 to 180 of about 5,177 (218)

Infra-red spectra of hydroxyapatite, octacalcium phosphate and pyrolysed octacalcium phosphate

Archives of Oral Biology, 1966
Infra-red spectra of hydroxyapatite, octacalcium phosphate and pyrolysed octacalcium phosphate were studied in the range 4000-400 cm−1, and probable band assignments are given. Unreported bands were found for both octacalcium phosphate (thirteen bands) and hydroxyapatite (five bands); the hydroxyapatite band at 631 cm−1 was reassigned to the ...
B O, Fowler, E C, Moreno, W E, Brown
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Conversion of octacalcium phosphate in calcium phosphate cements

Journal of Biomedical Materials Research, 2000
This study investigated the in vitro conversion reaction in calcium phosphate cements (CPCs) containing octacalcium phosphate (OCP) as one of the reagents. OCP is known to be a precursor for apatite formation in vivo. The reaction products were characterized using infrared spectroscopy and X-ray diffraction.
E A, De Maeyer, R M, Verbeeck, C W, Vercruysse   +2 more
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Biomimetic gelatin–octacalcium phosphate core–shell microspheres

Journal of Colloid and Interface Science, 2011
Calcium phosphate/polymeric microparticles synthesized through a biomimetic approach are regarded with increasing interest for their various potential applications, including tissue engineering and regenerative medicine. Herein we report the synthesis and characterization of gelatin/octacalcium phosphate core/shell microspheres.
BOANINI, ELISA, BIGI, ADRIANA
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Thermal conversion of octacalcium phosphate into hydroxyapatite

Journal of Inorganic Biochemistry, 1990
The thermal conversion of octacalcium phosphate into hydroxyapatite has been investigated by a crystallographic, thermogravimetric, and calorimetric study. The conversion of octacalcium phosphate takes place through the remotion of three of its five water molecules and yields a poor crystalline apatitic phase.
BIGI A, COJAZZI G, GAZZANO M, RIPAMONTI A, ROVERI, N   +5 more
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Collapsed Octacalcium Phosphate Stabilized by Ionic Substitutions

Crystal Growth & Design, 2010
We have explored the possibility of introducing biologically relevant ions, namely Sr(2+), Mg(2+), and Mn(2+), into the structure of octacalcium phosphate (OCP). OCP with partial substitutions of Sr(2+) and Mg(2+) for Ca(2+) up to 7.4 and 1.0 at%, respectively, was successfully synthesized.
BOANINI, ELISA, M. Gazzano, RUBINI, KATIA, BIGI, ADRIANA   +3 more
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Features of Octacalcium Phosphate Thermolysis

Refractories and Industrial Ceramics, 2014
Octacalcium phosphate (OCP) is synthesized by pyrolysis of brushite CaHPO4 · H2O in an acetate buffer solution at 60 °C and pH = 7.5. OCP thermolysis is performed in the range 200 – 700 °C. The starting OCP and powder obtained is studied by IR-spectroscopy, electron microscopy, and x-ray-phase analyses.
V. I. Putlyaev, E. V. Kukueva, T. V. Safronova, V. K. Ivanov, B. R. Churagulov   +4 more
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Reversible Structural Changes of Octacalcium Phosphate and Labile Acid Phosphate

Journal of Dental Research, 1995
Acid phosphate is one of the major impurities incorporated into bioapatites, and its quantity and environment in forming mineral have been used as diagnostic probes to pursue acidic precursor(s). Currently, little is known about the structural feature of non-stoichiometric octacalcium phosphate (OCP), which has been advocated to be, most plausibly ...
O, Suzuki, H, Yagishita, T, Amano, T, Aoba   +3 more
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Kinetics of crystallization of octacalcium phosphate

The Journal of Physical Chemistry, 1984
Cristallisation a 37°C de Ca 8 H 2 (PO 4 ) 6 •5H 2 O a partir de solutions sursaturees metastables, sur ...
J. C. Heughebaert, G. H. Nancollas
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Ion incorporation into octacalcium phosphate hydrolyzates

Journal of Crystal Growth, 1991
Abstract There is considerable evidence indicating that biominerals are formed by precipitation of octacalcium phosphate followed by its hydrolysis. Therefore, the hydrolysis of octacalcium phosphate was studied in aqueous solutions of alkali nitrates/chlorides or carbonates.
B.B. Tomazic, I. Mayer, W.E. Brown
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Octacalcium Phosphate as a Precursor in Biomineral Formation

Advances in Dental Research, 1987
What are biominerals and how are they formed? It is usually assumed: (i) that the prototype for most apatitic biominerals is hydroxyapatite (OHAp), Ca5(PO4) 3OH; and (ii) that the OHAp structure has been modified by the presence of impurity ions and vacancy defects in specific OHAp lattice sites.
W E, Brown, N, Eidelman, B, Tomazic
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