Phosphorus Research Bulletin最新文献

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Preparation of fibrous hydroxyapatite particles by homogeneous precipitation and microwave-assisted hydrothermal heating 微波辅助水热均匀沉淀法制备纤维状羟基磷灰石颗粒
Phosphorus Research Bulletin Pub Date : 2018-01-01 DOI: 10.3363/PRB.34.1
Ryuto Kuniya, T. Sumi, S. Horikoshi, T. Toyama, K. Itatani
{"title":"Preparation of fibrous hydroxyapatite particles by homogeneous precipitation and microwave-assisted hydrothermal heating","authors":"Ryuto Kuniya, T. Sumi, S. Horikoshi, T. Toyama, K. Itatani","doi":"10.3363/PRB.34.1","DOIUrl":"https://doi.org/10.3363/PRB.34.1","url":null,"abstract":"Preparation conditions of fibrous hydroxyapatite (Ca10(PO4)6(OH)2: HAp) particles were examined by two-step chemical routes: (i) the preparation of fibrous octacalcium phosphate (Ca8H2(PO4)6·5H2O: OCP) particles by homogeneous precipitation, using 0.0333 ~ 0.0500 mol∙dm Ca(NO3)2, 0.0200 ~ 0.0300 mol∙dm 3 (NH4)2HPO4, 0.04 ~ 0.40 mol∙dm 3 urea ((NH2)2CO; precipitant) and conc. HNO3, and (ii) the microwave-assisted hydrothermal heating of OCP particles at 130oC for 1 ~ 3 h. The fibrous HAp particles with the mean long-axis length of 307 m were obtained when the calcium phosphate solution containing 0.0333 mol∙dm Ca(NO3)2, 0.0200 mol∙dm 3 (NH4)2HPO4 and 0.12 mol∙dm 3 (NH2)2CO, was heated under flux at 80oC for 24 h, followed by the microwave-assisted hydrothermal heating at 130oC for 3 h. The mean long-axis length decreased down to 255 m, after the heating under reflux and microwave-assisted hydrothermal heating of the calcium phosphate solution containing 0.050 mol∙dm Ca(NO3)2, 0.030 mol∙dm 3 (NH4)2HPO4 and 0.20 mol∙dm 3 (NH2)2CO. Instead, the microwave-assisted hydrothermal heating of OCP particles in the HAp-dissolved solution, i.e., the dissolution of HAp powder by bubbling CO2 gas, helped increasing the mean long-axis length to 437 m. (Received Dec 7, 2017; Accepted Jan 16, 2018)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"30 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82643557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
PREPARATION OF NOVEL CERIUM PHOSPHATE WHITE PIGMENT 新型磷酸铈白色颜料的制备
Phosphorus Research Bulletin Pub Date : 2018-01-01 DOI: 10.3363/PRB.34.14
H. Onoda, H. Muraki
{"title":"PREPARATION OF NOVEL CERIUM PHOSPHATE WHITE PIGMENT","authors":"H. Onoda, H. Muraki","doi":"10.3363/PRB.34.14","DOIUrl":"https://doi.org/10.3363/PRB.34.14","url":null,"abstract":"Catalytically active cerium dioxide is used as light reflection materials for cosmetic applications. Therefore, cosmetics containing this pigment cause oxidation of the skin. From this fact, the substitute for cerium dioxide is required to prepare the cosmetics without catalytic activity. Herein, as novel white pigments for use in cosmetics, cerium phosphate was prepared at various pH values. The chemical composition, powder properties, catalytic activity, color, and smoothness of the cerium phosphate were evaluated. All samples prepared in this work indicated XRD pattern of the cerium phosphate hydrate. The sample prepared at pH 4 had relatively small particles and low static friction resistance. The samples prepared at pH 5, 6, and 7 had no photocatalytic activity. The samples prepared at pH 5 and 6 exhibited high reflectance within the range of visible light. (Received Nov 20, 2018; Accepted Dec 17, 2018)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"1 1","pages":"14-18"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88079343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PHOSPHORYLATION OF HYDROXYPROLINE WITH TRISODIUM CYCLO-TRIPHOSPHATE AND EVALUATION OF THEIR MOISTURE RETAINING PROPERTY 羟基脯氨酸与环三磷酸三钠的磷酸化及其保湿性能评价
Phosphorus Research Bulletin Pub Date : 2018-01-01 DOI: 10.3363/PRB.34.9
Hideko Maeda, Saki Tsuchida, H. Nariai, H. Nakayama
{"title":"PHOSPHORYLATION OF HYDROXYPROLINE WITH TRISODIUM CYCLO-TRIPHOSPHATE AND EVALUATION OF THEIR MOISTURE RETAINING PROPERTY","authors":"Hideko Maeda, Saki Tsuchida, H. Nariai, H. Nakayama","doi":"10.3363/PRB.34.9","DOIUrl":"https://doi.org/10.3363/PRB.34.9","url":null,"abstract":"Phosphorylation of hydroxyproline (Hyp) has been achieved using inorganic trisodium- cyclo -triphosphate (P 3m ) in aqueous solution. In the reaction of Hyp (1.5 M) and P 3m (0.5 M), at pH 11, and 10 ºC, N -triphosphoryl hydroxyproline (P 3 -( N )-Hyp) was synthesized. An intramolecular attack of carboxyl group on a phosphorus atom of P 3 -( N )-Hyp yields cyclic phosphate derivative (P 1 -( N , O )-Hyp). Hydrolysis of cyclic phosphate derivative occurs simultaneously to form N -phosphoryl hydroxyproline (P 1 -( N )-Hyp). Here, we were able to show that Hyp reacts with P 3m to form the intermediates (P 3 -( N )-Hyp and (P 1 -( N , O )-Hyp) and give the final product (P 1 -( N )-Hyp). The optimum condition for P 1 -( N )-Hyp was Hyp : P 3m = 2(1.0 M) : 1(0.5 M), pH 13, and 25 ºC. P 1 -( N )-Hyp was synthesized by dissolving Hyp and P 3m in H 2 O under the optimum conditions for 7 days, and isolated by adding 2-propanol to the reaction solution. The moisture retention of P 1 -( N )-Hyp and Hyp alone were compared by measuring amount of water. The moisture retention of the P 1 -( N )-Hyp can be increased more effectively than that of Hyp alone.","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"40 1","pages":"9-13"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76742896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FABRICATION OF POTASSIUM-SUBSTITUTED HYDROXYAPATITE CERAMICS VIA ULTRASONIC SPRAY-PYROLYSIS ROUTE 超声喷雾热解法制备钾取代羟基磷灰石陶瓷
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.35
Tomohiro Yokota, M. Honda, M. Aizawa
{"title":"FABRICATION OF POTASSIUM-SUBSTITUTED HYDROXYAPATITE CERAMICS VIA ULTRASONIC SPRAY-PYROLYSIS ROUTE","authors":"Tomohiro Yokota, M. Honda, M. Aizawa","doi":"10.3363/PRB.33.35","DOIUrl":"https://doi.org/10.3363/PRB.33.35","url":null,"abstract":"Biological apatite presented in bone and teeth of mammals contains various ions, such as Na, K, Mg, F and CO3 ions, in trace levels. Substitution of the above ions into hydroxyapatite (HAp) have great effect on the crystallinity, morphology, lattice parameters and stability of the apatite structure. It is known that potassium (K) in the living bone give a tremendous effect to the biomineralization process. Aim of this study is to clarify the influence of substitution of potassium into the HAp structure on the properties of powders and ceramics. In this study, we have fabricated the potassium-substituted hydroxyapatite (KAp) ceramics via an ultrasonic spray-pyrolysis route. Effect of potassium substitution on the phase, chemical composition, morphology and crystal lattice structure of HA was examined. Experimental results showed that the addition of potassium does not significantly affect the crystal phase, particle morphology and particle size. Sintered bodies fabricated from KAp powders were of single phase of HAp, and lattice constants of a-axis and c-axis increased with potassium contents. Substitution of potassium into the HAp lattice formed OH vacancies and caused grain growth. (Received Oct 19, 2017; Accepted Nov 21, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"82 1","pages":"35-40"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83774976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
INTRODUCTION OF PHOSPHATE GROUP INTO β-ARBUTIN BY CYCLO-TRIPHOSPHATE 环三磷酸法将磷酸基团引入β-熊果苷
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.21
Hideko Maeda, M. Katsushiro, H. Nariai, H. Nakayama
{"title":"INTRODUCTION OF PHOSPHATE GROUP INTO β-ARBUTIN BY CYCLO-TRIPHOSPHATE","authors":"Hideko Maeda, M. Katsushiro, H. Nariai, H. Nakayama","doi":"10.3363/PRB.33.21","DOIUrl":"https://doi.org/10.3363/PRB.33.21","url":null,"abstract":"Phosphorylation of -arbutin has been achieved using inorganic cyclo-triphosphate (P3m) in aqueous solution. The optimum condition for the phosphorylation of -arbutin with P3m is -arbutin : P3m = 0.1 mol/L : 0.5 mol/L, pH 11 and 40oC. 4-Triphospho--arbutin was synthesized with the yield of 90%. The reaction mechanism of -arbutin with P3m was discussed. We have successfully introduced the triphosphate group in one molecule. Phosphorylated -arbutin is expected that the permeability of -arbutin into the skin will be increased by introducing a phosphate group. (Received Jul 7, 2017; Accepted Aug 2, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"5 1","pages":"21-25"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84364491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SYNTHESIS AND CHARACTERIZATION OF Mn-DOPED CALCIUM HYDROXYAPATITE PARTICLES 掺锰羟基磷灰石钙颗粒的合成与表征
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.26
K. Kandori, Yuto Yamaguchi
{"title":"SYNTHESIS AND CHARACTERIZATION OF Mn-DOPED CALCIUM HYDROXYAPATITE PARTICLES","authors":"K. Kandori, Yuto Yamaguchi","doi":"10.3363/PRB.33.26","DOIUrl":"https://doi.org/10.3363/PRB.33.26","url":null,"abstract":"Colloidal manganese (Mn)-doped calcium hydroxyapatites (abbreviated as MnHap) were prepared by the coprecipitation method. The Mn/(Ca+Mn) atomic ratio in the solution (abbreviated as XMn) was varied from 0~0.30. The precipitated particles were characterized by various physicochemical analyses, i.e., TEM, XRD, N2 and H2O adsorptions, TG, FTIR, ICP-AES and XPS measurements. The MnHap particles were produced at 0.01≤XMn≤0.2. The calcium hydroxyapatite produced without Mn ions (XMn=0) was rod-like particles with 23 nm (width) x 55 nm (length). With increase in XMn up to 0.06, the particle width was decreased. The thickness of the rod-like particles produced at XMn≥0.08 was further decreased to ca. 3~5 nm. The spherical nano-particles with ca. 7 nm in diameter precipitated at XMn=0.3 were -TCP and amorphous particles of -MnOOH precursor. The particle color was varied from white to brown, dark-brown and pale-red. The ICP-AES measurement revealed that all the MnHap particles are cation-deficient with XMn values among 1.52~1.63. The lattice constants of c-axis was decreased with increase in XMn at XMn≥0.05 by incorporation of Mn(III) and Mn(IV) ions with smaller atomic radii, 0.072 and 0.053 nm, respectively, instead of Mn(II) ones (0.089 nm). The XPS measurement also revealed that there is no Mn(II) in the MnHap particles but they include both Mn(III) and Mn(IV) ions. The in vacuo IR measurements suggested that the incorporation of Mn ions increased the acidity of surface P-OH groups. (Received May 11, 2017; Accepted Oct 16, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"11 1","pages":"26-34"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78279738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Preparation of millimeter-scale fibrous octacalcium phosphate particles by homogeneous precipitation method 均匀沉淀法制备毫米级纤维状磷酸八钙颗粒
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.14
Ryuto Kuniya, K. Itatani
{"title":"Preparation of millimeter-scale fibrous octacalcium phosphate particles by homogeneous precipitation method","authors":"Ryuto Kuniya, K. Itatani","doi":"10.3363/PRB.33.14","DOIUrl":"https://doi.org/10.3363/PRB.33.14","url":null,"abstract":"Preparation conditions of millimeter-scale fibrous octacalcium phosphate (Ca8H2(PO4)6·5H2O: OCP) particles by homogeneous precipitation method were examined, using Ca(NO3)2, (NH4)2HPO4, urea ((NH2)2CO; precipitant) and conc. HNO3 (precipitation inhibitor). The starting solution (200 cm) with 0.0266 mol∙dm Ca(NO3)2 and 0.0200 mol∙dm (NH4)2HPO4, i.e., the stoichiometric Ca/P ratio of OCP (=1.33), was heated under reflux at 80oC for 24 h in order to encourage the precipitation, due to the hydrolysis of urea to dissociate ammonia; however, the reaction products were not only OCP but also CaHPO4. The increase in Ca/P ratio and diluted concentrations of starting calcium phosphate solution made the formation of longer fibrous OCP particles possible, i.e., approximately 1000m of mean long-axis length due to the heating of 0.0500 mol∙dm Ca(NO3)2 and 0.0300 mol∙dm (NH4)2HPO4 solution (Ca/P ratio=1.67) under reflux and approximately 1200m due to the heating of 0.0500 mol∙dm Ca(NO3)2 and 0.0250 mol∙dm (NH4)2HPO4 solution (Ca/P ratio=2.00)), both using 0.20 mol∙dm urea. (Received Mar 26, 2017; Accepted Apr 20, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"66 1","pages":"14-20"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74597817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
EFFECTS OF ADDITION OF α-TRICALCIUM PHOSPHATE POWDERS ON MATERIAL PROPERTIES OF THE CHELATE-SETTING HYDROXYAPATITE CEMENT α-磷酸三钙粉的加入对螯合固化羟基磷灰石水泥材料性能的影响
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.7
Keishi Kiminami, Kento Matsuoka, Toshiisa Konishi, Minori Mizumoto, M. Honda, Hidetoshi Arimura, M. Aizawa
{"title":"EFFECTS OF ADDITION OF α-TRICALCIUM PHOSPHATE POWDERS ON MATERIAL PROPERTIES OF THE CHELATE-SETTING HYDROXYAPATITE CEMENT","authors":"Keishi Kiminami, Kento Matsuoka, Toshiisa Konishi, Minori Mizumoto, M. Honda, Hidetoshi Arimura, M. Aizawa","doi":"10.3363/PRB.33.7","DOIUrl":"https://doi.org/10.3363/PRB.33.7","url":null,"abstract":"We have previously developed a chelate-setting calcium-phosphate cement (CPC) consisting of hydroxyapatite (HAp) powders surface-modified with inositol hexaphosphate (IP6). In the present study, mechanically ball-milled α-tricalcium phosphate (α-TCP) powders were added into the IP6-HAp cement in order to enhance its anti-washout capability and mechanical properties. After optimization of the ball-milling conditions, the cement specimens mixed with various amounts of the prepared α-TCP powders were fabricated. Examinations of their mechanical properties revealed significant increase of compressive strength (CS) with the addition of the α-TCP powders. Further, it was demonstrated that the specimens of the IP6-HAp powders / the α-TCP powders mixing ratios of 20/80 and 30/70 [g/g] exhibited comparatively high anti-washout capability. In conclusion, these cements are promising chelate-setting CPCs with enhanced anti-washout capability and mechanical properties. (Received Feb 8, 2017; Accepted Mar 17, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"12 1","pages":"7-13"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83165789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
MICROCRACKS DESIGN AND BONE INDUCTION OF SKULL BONE MODIFIED BY ULTRASONIC TREATMENT USING ACIDIC ELECTROLYZED WATER 酸性电解水超声改性颅骨微裂纹设计及骨诱导
Phosphorus Research Bulletin Pub Date : 2017-01-01 DOI: 10.3363/PRB.33.1
M. Shakya, M. Murata, N. Okubo, H. Nagayasu, T. Akazawa
{"title":"MICROCRACKS DESIGN AND BONE INDUCTION OF SKULL BONE MODIFIED BY ULTRASONIC TREATMENT USING ACIDIC ELECTROLYZED WATER","authors":"M. Shakya, M. Murata, N. Okubo, H. Nagayasu, T. Akazawa","doi":"10.3363/PRB.33.1","DOIUrl":"https://doi.org/10.3363/PRB.33.1","url":null,"abstract":"use 9pt): Healthy bone has many physiological microcracks, which may be involved in the release of bone matrix-derived factors and act to accelerate bone-remodeling process. In this study, the mouse parietal bone fragments (5x5x1mm) were demineralized by acidic electrolyzed water (AEW: pH2.7) or distilled water (DW: pH5.2) at 120W and 38KHz for 20 min. Each bone was implanted into subcutaneous tissue of 10 week-old male nude mouse, and explanted at 4 and 6 weeks. AEW-bone showed clear enlargement and union of cracks on SEM. AEW-bone revealed active bone induction over wide areas at 6 weeks, while DW-bone induced new bone in limited area. We concluded that the AEW-bone had better performance in bone induction than the DW-bone. Our micro-damage technique combined with AEW and the ultrasonic irradiation will contribute to improve surface area and 3D structure of the dense bone and promote bone formation in the initial stage for bone remodeling. (Received Jan 20, 2017; Accepted Mar 1, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"10 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75798562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SYNTHESIS and PROPERTIES of NON-RIGID CALCIUM PHOSPHATE CEMENT CONTAINING CHITOSAN 壳聚糖非刚性磷酸钙水泥的合成及性能研究
Phosphorus Research Bulletin Pub Date : 2016-01-01 DOI: 10.3363/PRB.31.38
Y. Yokogawa, T. Murata, H. Yamada, K. Fujii, K. Tone, Y. Okada
{"title":"SYNTHESIS and PROPERTIES of NON-RIGID CALCIUM PHOSPHATE CEMENT CONTAINING CHITOSAN","authors":"Y. Yokogawa, T. Murata, H. Yamada, K. Fujii, K. Tone, Y. Okada","doi":"10.3363/PRB.31.38","DOIUrl":"https://doi.org/10.3363/PRB.31.38","url":null,"abstract":"Calcium phosphate cement (CPC) has biocompatibility and osteoconductive property, but it has some drawbacks, such as wash-out and rigid and brittle properties. Such drawbacks can be overcome by fast-setting and gelation of the CPC paste. The CPC powder is a mixture of tetracalcium phosphate and dicalcium phosphate dehydrate. A low or medium molecular weight chitosan (lowor med-chitosan) and malic acid solution were used in the liquid phase to develop fast-setting and high work-of-fracture CPC materials. The incorporation of 1.25 2.5 wt% chitosan increased a tripled work-of-fracture to 12.0 kJ/m when not using chitosan. The setting time was 2.8±0.3 min and 5.5±0.5 min when 2.5 wt% lowor med-chitosan was used, respectively. The \"non-rigid” and “fast-setting\" CPC cement was successfully obtained by adding chitosan and malic acid to the liquid phase, and the incorporation of med-chitosan may produce a high work-of-fracture and stable CPC with a desirable setting time. (Received March 31, 2016; Accepted May 2, 2016)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"12 1","pages":"38-43"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84401553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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