A calcium hydroxyapatite precipitated from an aqueous solution

Arends, J; Christoffersen, J.; Christoffersen, Margaret R.; Eckert, Hellmut; Fowler, Bruce O.; Heughebaert, J. C.; Nancollas, G.H.; Yesinowski, James P.; Zawacki, S. J.

doi:10.1016/0022-0248(87)90284-3

Cited by 229 publications

(132 citation statements)

References 21 publications

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“…Other possible phases could be calcium phosphate compounds such as amorphous calcium phosphates (ACP) with variable compositions of Ca 3 (PO 4 ) 2−2x (HPO 4 ) 3x ·nH 2 O, octacalcium phosphate (OCP), Ca 8 (HPO 4 ) 2 (PO 4 ) 4 ·5H 2 O, and calcium hydrogen phosphate dihydrate (DCPD), CaHPO 4 ·2H 2-O (brushite) [3]. In addition trace impurities such as hydrogen phosphate, carbonate, silicate, etc., are always found to be present in any preparative procedure of HA [4].…”

Section: Introductionmentioning

confidence: 94%

“…HA was precipitated at room temperature in aqueous medium by the slow addition of diammonium hydrogen orthophosphate containing NH 4 OH solution (for maintaining pH ∼ 11) to a solution of calcium nitrate tetrahydrate (also containing NH 4 OH solution for maintaining pH ∼ 11). The solution was stirred constantly for 24 h by a mechanical stirrer, allowing the reaction to complete.…”

Section: Preparation Of Calcium Phosphate Ceramicsmentioning

confidence: 99%

“…Raynaud et al [10] synthesized single phase calcium phosphate powders with Ca/P molar ratio ranging from 1.5 to 1.67 using wet chemical method. Outside this compositional range the powders were found to be biphasic mixtures composed of calcium phosphate apatite and CaHPO 4 when Ca/P was below 1.5. When this ratio was above 1.67, Ca (OH) 2 along with calcium phosphate apatite was found to be present.…”

Section: Introductionmentioning

confidence: 99%

“…HA can be prepared by several synthetic routes which include hydrolysis, hydrothermal synthesis, hydrothermal exchange, solid processes from bovine bone, sol-gel processes, spray pyrolysis from natural coralline and wet chemical methods [3][4][5][6][7][8][9]. Among these techniques, the most popular is the wet chemical route.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and sintered properties evaluation of calcium phosphate ceramics

Pattanayak

Dash

Prasad

et al. 2007

Materials Science and Engineering: C

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Section: Introductionmentioning

confidence: 94%

Section: Preparation Of Calcium Phosphate Ceramicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Pattanayak

Dash

Prasad

et al. 2007

Materials Science and Engineering: C

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“…For both apatites the amount of released phosphate was the highest for the initial pH 3. This confirms that the apatite solubility increases with decreasing pH (Chien et al 1975, Arends et al 1987, Narasaraju et al 1971, Narasaraju & Phebe 1996. The higher solubility of the HAP as compared to the FAP is caused by the difference in solubility products (K SP ) of the minerals which are equal to 10 -58.23 and 10 -59.56 , respectively (Lindsay 1979).…”

Section: Apatites Dissolutionmentioning

confidence: 72%

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Matusik¹,

Bajda²,

Manecki³

2012

geol

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Reducing the bioavailability of toxic heavy metals in groundwaters and urban soils by phosphate addition is an effective technique described in the literature. It is based on the reaction between metal ions and phosphates and results in the precipitation of metal substituted phosphate phases. The formed phosphates are highly insoluble and thermodynamically stable over almost entire pH and Eh range. In the presented study the efficiency and mechanism of cadmium uptake by synthetic hydroxylapatite and natural fluoroapatite was examined within the pH range of 3 7 for different reaction times (2 1440 hours). The solids after reactions were characterized by XRD and SEM-EDS. Percentage reduction of cadmium concentration in the experiments with fluoroapatite and hydroxylapatite, regardless of pH, did not exceed 17% and 25%, respectively. Cadmium uptake from the solution mainly resulted from the formation of cadmium phosphates and/or Ca-Cd phosphate solid solutions on the apatites surface. The release rate of phosphate ions by hydroxylapatite was relatively high. This promoted crystallization of a large number of small crystals. In turn dissolution of fluoroapatite was slower and thus the formation of large crystals was observed. There was no clear evidence for cadmium-calcium ion-exchange mechanism.

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Basic fibroblast growth factor adsorption and release properties of calcium phosphate

Midy

Rey

Brès

et al. 1998

J. Biomed. Mater. Res.

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Basic fibroblast growth factor (bFGF) is well known as a potent angiogenic factor playing a crucial role in wound-healing processes. Apatitic substrates such as hydroxyapatite and carbonated apatite (CA) could be potential carriers of growth factors because of their physicochemical similarities to bone mineral. These materials have been compared for their bFGF adsorption and release properties. The adsorption of the growth factor was higher on carbonated apatite than on hydroxyapatite, probably owing to environments with labile nonapatitic CO3(2-) and HPO4(2-) groups, along with a higher specific surface area which gives the CA a higher surface reactivity. These environments can be exchanged very rapidly, leading to the release of bFGF. The controlled release of adsorbed growth factor from carbonated apatite could provide means of improving bone healing in the future.

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A calcium hydroxyapatite precipitated from an aqueous solution

Cited by 229 publications

References 21 publications

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Synthesis and sintered properties evaluation of calcium phosphate ceramics

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Basic fibroblast growth factor adsorption and release properties of calcium phosphate

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