Preparation and characterization of hydrophobic calcium hydroxyapatite particles grafting oleylphosphate groups

Kandori, Kazuhiko; Fujiwara, Aya; Yasukawa, Akemi; Ishikawa, Tatsuo

doi:10.1016/s0927-7757(98)00717-1

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…From 31 P MAS-NMR analysis of ungrafted apatite, a single phosphorus peak is observed at 2.9 ppm versus 85% H 3 PO 4 similar to that found in synthetic apatites and bone and teeth [31-33]. This confirms that one crystallographic site is available in the structure as demonstrated in previous works [34-36]. In addition to the sharp resonance at 2.9 ppm, one broad resonance around at 19.6 ppm is observed in grafted apatite (Fig.…”

Section: Resultssupporting

confidence: 84%

Synthesis and characterization of nanoapatites organofunctionalized with aminotriphosphonate agents

Saoiabi

Asri²,

Laghzizil³

et al. 2012

Journal of Solid State Chemistry

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Organofunctionalized apatite nanoparticles were prepared using a one step process involving dissolution/precipitation of natural phosphate rock and covalent grafting of nitrilotris(methylene)triphosphonate (NTP). The synthesized materials were characterized by Brunauer–Emmett–Teller (BET) surface measurement, thermogravimetry, inductively coupled plasma emission spectroscopy (ICP-ES), elemental analysis, multinuclear solid state cross-polarization/magic angle spinning (CP/MAS) and single-pulse NMR spectroscopy, transmission electron microscopy (TEM) and energy dispersive x-ray analysis (EDXA). After grafting BET measurements yielded particle specific surface areas ranging from 88 to 193 m2 g−1 depending on the grafted phosphonate. The results show that the surfaces of the nanoapatite particles can be covered with functional groups bound through a variable number of R-P-O-Ca bonds to render them organoapatites.

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Section: Resultssupporting

confidence: 84%

Synthesis and characterization of nanoapatites organofunctionalized with aminotriphosphonate agents

Saoiabi

Asri²,

Laghzizil³

et al. 2012

Journal of Solid State Chemistry

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“…In order to elucidate more detail of this mechanism, information about interaction between organic phosphate and CaHap is required. There are many studies reported about the interaction by Bottari and Porto [3], Suga and Okabe [4], Lebugle and co-workers [5][6][7], Ozin et al [8], Kandori et al [9] and our group [10][11][12]. However, influence of hydrolysis of organic phosphates on the formation of CaHap has not been fully discussed except for our studies [13,14].…”

Section: Introductionmentioning

confidence: 62%

Influence of Strontium (Ii) on the Formation of Calcium Hydroxyapatite Prepared by Hydrolyzing Phenyl Phosphate Using Alkaline Phosphatase at 37°c

Tanaka

Nishimoto

2011

Phosphorus Research Bulletin

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Influence of Sr 2+ on the formation and structure of calcium hydroxyapatite (Ca 10 (PO 4) 6 (OH) 2 : CaHap) particles prepared by hydrolyzing the phenyl phosphate (C 6 H 5 PO 4 H 2) using alkaline phosphatase (ALP) at 37°C was examined. Increasing the additional amount of Sr 2+ increased the Sr content in the products and turned the crystal phase of the products as follow: CaHap  solid solution SrCaHap  Sr 1.7 Ca 1.3 (PO 4) 2  (3Sr(HPO 4) 2 •Sr 3 (PO 4) 2)•2H 2 O. All the phenyl phosphates were hydrolyzed by ALP at 37°C. The crystallinity and particle size of CaHap decreased with an increase of added Sr 2+ , meaning the inhibition of crystallization and particle growth. These facts suppose that incorporation of Sr 2+ in animal organism suppresses the formation of hard tissues.

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“…Hence, the modification of Hap surface with various organic and inorganic substances is expected to give novel functions to this material. There are many studies for surface modification of Hap by Lebugle et al 13,14) , Ozin et al 15) , Kandori et al 16) and the authors [17][18][19][20][21][22] . Lebugle et al studied the grafting of hydroxyethyl methacrylate phosphate and dodecanol phosphate to Hap surface by a coprecipitation method and claimed that the surface OH -ions of Hap replaced with these phosphate ions 13,14) .…”

Section: Calciummentioning

confidence: 99%

“…Ozin and collaborators reported the synthesis of composite of Hap and calcium dodecylphosphate and inferred the interface between Hap and calcium dodecyl lamellar phases to be chemically linked 15) . Kandori et al have grafted oleylphosphate to the surface of Hap 16) . The authors altered the surface structure and properties of Hap by regulation of surface P-OH groups with alkyl phosphate, carboxylic acid and silane coupling agent such as hexamethyldisilazane and 3-aminopropyl triethoxysilane [17][18][19][20][21][22] .…”

Section: Calciummentioning

confidence: 99%

Preparation and Surface Characterization of Calcium Hydroxyapatite Grafting of Phosphoethanolamine

Tanaka

Uchida

2010

Phosphorus Research Bulletin

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Calcium hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 : Hap) particles grafting of O-phosphoethanolamine (NH 2 (CH 2 ) 2 OPO 3 H 2 : PEA) were prepared by a coprecipitation method with a mixture of Ca(OH) 2 , H 3 PO 4 and PEA at different PEA/(PEA+H 3 PO 4 ) molar ratios in aqueous media at 85°C. The crystallinity and particle size of Hap were decreased with an increase of PEA/(PEA+H 3 PO 4 ) ratio, revealing that the crystal and particle growth of Hap were inhibited by grafting of PEA. The surface aminoethyl groups were generated by substituting the surface PO 4 3-of Hap with PEA ions, giving rise to the decrease of surface P-OH groups of Hap. The number of surface aminoethyl groups was increased with increasing the PEA/(PEA+H 3 PO 4 ) ratio and was ranged from 0.08 to 0.56 molecules/nm 2 . The surface aminoethyl groups would act as the irreversible adsorption sites of CO 2 .

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Preparation and characterization of hydrophobic calcium hydroxyapatite particles grafting oleylphosphate groups

Cited by 16 publications

References 14 publications

Synthesis and characterization of nanoapatites organofunctionalized with aminotriphosphonate agents

Synthesis and characterization of nanoapatites organofunctionalized with aminotriphosphonate agents

Influence of Strontium (Ii) on the Formation of Calcium Hydroxyapatite Prepared by Hydrolyzing Phenyl Phosphate Using Alkaline Phosphatase at 37°c

Preparation and Surface Characterization of Calcium Hydroxyapatite Grafting of Phosphoethanolamine

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