纳米掺锶羟基磷灰石及其在牙膏中的应用研究

采用化学沉淀法以金属锶元素取代纳米羟基磷灰石中的部分钙元素。可制得纳米掺锶羟基磷灰石；通过XRD、FTIR、TEM等手段，对纳米掺锶羟基磷灰石进行了结构分析；掺锶后提高了纳米掺锶羟基磷灰石的生物性能和使用性能，将其应用于牙膏，可以提高牙膏的使用功效作用，具有广阔的应用前景。     

微波合成掺锶羟基磷灰石

以SrCl2、Ca(NO3)2和(NH4)2HPO4为原料,采用微波法合成了掺锶羟基磷灰石。对制备的SrHAP进行元素含量分析,采用XRD对其结构进行了表征,并测定粉体产物的粒度。研究结果表明:采用微波法可以制备出元素组成接近原料计算化学计量比的掺锶羟基磷灰石;采用微波法可以快速得到结晶性好的SrHAP;掺锶量对微波合成的SrHAP的结构有显著影响;微波法比常规方法制备出的SrHAP粉体的粒度小。     

纳米掺锶羟基磷灰石的制备及其吸附性能研究

采用溶胶-凝胶-超临界流体干燥法制备了粒径在100 nm以下的纳米掺锶羟基磷灰石(SrHAP),以牛血清白蛋白(BSA)为吸附目标,研究了纳米SrHAP的吸附性能.结果发现在偏酸性条件下,纳米SrHAP比纳米HAP对BSA的吸附量大,表明掺锶后吸附性能提高;但在碱性条件下,纳米SrHAP对BSA的吸附量减小.纳米SrHAP对BSA的吸附是个快速吸附过程,增加Sr/[Ca Sr]原子比XSr和BSA的起始浓度有利于吸附,升高温度不利于吸附.     

固化条件对掺锶羟基磷灰石骨水泥凝结时间的影响

在类生理条件下制备了新型掺锶羟基磷灰石骨水泥,系统考察了固化条件,包括固化液浓度、固／液质量比、晶种含量、固化温度及掺锶量等对其凝结时间的影响规律。结果表明：合理选取稀磷酸固化液浓度、控制固／液质量比可以使该类水泥的凝结时间符合临床应用标准。固化液浓度较低时,加入适量的晶种可以有效缩短凝结时间。固化温度对掺锶羟基磷灰石骨水泥的固化过程有显著影响,提高温度促进水化进程,缩短了凝结时间。此外,相同固化条件下,掺锶量对该类水泥凝结时间有一定影响,表现出锶元素对羟基磷灰石结晶过程的阻滞效应。     

锶掺杂纳米羟基磷灰石的制备

骨缺损的治疗是临床研究中的一项重大挑战,在天然骨骼中发现的各种人体必需元素中,锶是一种非常特殊的元素。在人体中,锶具有很强的亲骨性。锶掺杂后的纳米羟基磷灰石,与未掺杂的羟基磷灰石相比表现出增强的促成骨细胞分化活性。     

纳米羟基磷灰石的制备方法及其在牙膏中的作用

羟基磷灰石(Hydroxyapatite)简称HAP或HA，化学分子式：Calo(PO4)6(OH)2，是人体和动物骨骼的主要无机成份。羟基磷灰石具有良好的生物相容性和生物活性，能与骨形成很强的化学结合，在体液的作用下，会发生部分降解，游离出钙和磷，并被人体组织吸收、利用，生长出新的组织，从而产生骨传导作用，因此引起了全世界材料工作者和医学工作者的广泛关注。     

溶胶-凝胶结合超临界流体干燥法制备纳米掺锶羟基磷灰石的研究

以硝酸钙、氯化锶、磷酸氢二氨等无机盐为原料,采用溶胶-凝胶结合超临界流体干燥法,制备了羟基磷灰石(HAP)纳米微粒、钙被半取代的掺锶羟基磷灰石(SrCaHAP)纳米微粒以及钙被全取代的掺锶羟基磷灰石(SrHAP)纳米微粒.通过元素含量分析、TEM、XRD、FT-IR等手段,对这些纳米微粒的结构进行了分析;探讨了锶的掺入对羟基磷灰石(HAP)的结构、晶形以及结晶度的影响.结果表明:采用溶胶-凝胶结合超临界CO2干燥法,在给定的反应条件下按Sr/[Sr Ca]原子比为0、0.5、1,锶可以按化学计量比掺入到HAP的分子结构中,可分别制备纯度较高、晶型结构较好的HAP、SrCaHAP和SrHAP纳米微粒.HAP掺入锶元素后,不仅降低SrCaHAP和SrHAP 中OH(,PO3(主要官能团的红外光谱吸收峰的振动频率,还改变了纳米微粒的晶形,从短棒状的HAP改变为针状的SrCaHAP,再改变为短棒状的SrHAP.HAP中钙被锶半取代后形成SrCaHAP,微粒结晶度降低,生物学性能改善;当钙被锶完全取代后形成不含钙的SrHAP,微粒结晶度增加,生物学性能变差.     

多孔羟基磷灰石生物陶瓷的进展

多孔羟基磷灰石生物陶瓷是一种性能优异的人体硬组织修复材料，在植入界面后它具生物降解性，置入体内能逐步参与代谢以至最终与人体骨结合成一体。本文在综合大量国内外文献的基础上，阐述了多孔羟基磷灰石生物陶瓷的性质、研究和发展。     

一种锶羟基磷灰石的制备方法

本发明公开了一种锶羟基磷灰石的制备方法；是以硝酸锶、氯化锶、硝酸钙、氯化钙、氧化钙、磷酸氢二钾、磷酸氢二钠、磷酸氢二铵、磷酸二氢钾、磷酸二氢钠、磷酸二氢铵为原料，在加温和密封隔离条件下，在碱催化剂作用下，经过搅拌、过滤、煅烧等过程制备得到固体锶羟基磷灰石。用本法制备的产率为91％；缩短了反应时间，提高了生产效率和设备利用率，降低了生产成本，突破了传统制备中，     

美国口腔护理品市场动向

随着口腔护理用品的不断更新，很难预料到有朝一日有哪些新品问世。但口腔护理在这一进程中始终占据着主角。健康白净的牙齿使消费者的笑容看上去更年轻。口气清新及口腔清洁将是口腔护理品市场的趋势。先进的产品帮助消费者在口腔护理品的消费上迈向更高的水准。舒适、快捷和方便的口腔护理品始终是消费者的首选。     

Crystalline selenite substituted carbonated hydroxyapatite nanorods: Synthesis,characterization, evaluation of bioactivity and cytotoxicity

Synthesis of pure and selenite substituted hydroxyapatites (HAP and Se‐HAP with 0.02–0.10 Se) by sol–gel method and evaluation of their morphological features, nature of functional groups, phase purity, in vitro bioactivity and cytotoxicity are addressed. Spectral studies confirm the incorporation of selenite into the HAP lattice, accompanied by an increase in CO₃^2? content to maintain the charge imbalance following replacement of P⁵⁺ with Se⁴⁺, thus making the formation of selenite substituted carbonated HAP. Selenite substitution in the HAP lattice has led to a higher crystallinity and increased the crystallite size. The morphology of HAP is changed from sphere to rod‐like structure upon substitution by selenite and the size of the rod is increased with an increase in the selenite content. Among the Se‐HAPs, a better in vitro bioactivity and cell viability are observed for 0.02 Se‐HAP and 0.04 Se‐HAP while the trend is reversed when the extent of selenite substitution becomes higher.     

Microwave-assisted low-cost synthesis of sucrose-soya ester from vegetable oil refinery by-product and its application in toothpaste formulation for oral hygiene

The major drawbacks of the sucrose ester (SE), in spite of being a green nonionic surfactant, are the difficulty of synthesis and higher cost. Distilled soya acid oil (DSAO) obtained as by-product from a vegetable oil refinery was used for the synthesis of fatty acid methyl ester (SAFAME). Microwave-assisted method (680 watts system), which is greener and more efficient was used for the synthesis of SAFAME at 99.3% conversion using 2 wt% sulfuric acid catalyst within 30 min as well as for the synthesis of SE at 82.5% conversion using 5 wt% K₂CO₃ catalyst within 45 min. Both synthesis steps were monitored and characterized by using thin-layer chromatography, gas chromatography, ¹H NMR, and FT-IR. The surface tension of 1% aq. solution of SE was 29.58 mN m⁻¹, while the interfacial tension of n-heptane-1% aq. solution was observed to be 3.29 mN m⁻¹. The critical micelle concentration was 74.24 mg L⁻¹. Foaming properties, emulsion stability, and wetting power were determined by using standard techniques. The SE was used for the development of desensitizing anticavity toothpaste formulation and the various properties were evaluated in comparison with the commercial toothpaste formulation available in the market. The results show that the partially renewable surfactants like sodium dodecyl sulfate (SDS) and sodium lauryl ether sulfate (SLES) can be replaced partially or fully with the biobased renewable SE surfactants in the various personal care formulations including toothpaste.     

透明质酸在口腔护理产品领域的应用

简要介绍了透明质酸在口腔环境中的作用及与口腔健康的关系;重点综述了透明质酸对滋润口腔,改善口干、抑制牙菌斑、改善牙龈状况、促进细胞增殖、修复口腔损伤等口腔护理方面的作用.同时介绍了市售含透明质酸原料的牙膏、漱口水等产品的发展现状,对透明质酸在口腔护理产品中的应用前景进行了展望.     

羟基磷灰石微孔材料的制备及应用

采用化学沉淀法,以四水硝酸钙和磷酸钠为原料,利用酵母细胞(YEAST)作为生物模板,合成了羟基磷灰石微孔材料(Y-HA),并采用X射线衍射(XRD)、红外分析、扫描电镜(SEM)进行了表征分析;研究了该材料对含Cd2+模拟废水的处理效果,考查了pH值、吸附时间、吸附剂用量等因素对吸附效果的影响,并从理论上初步分析了吸附机理。实验结果表明:该YEAST-HA材料对含Cd2+废水的去除效果明显,YEAST-HA去除水体中Cd2+的最佳吸附条件和吸附效果分别是:在pH值为7.0、反应时间35 min、HA用量0.06 g/L的条件下,其对Cd2+的去除率可达到98.17%。     

A duplex coating composed of electrophoretic deposited graphene oxide inner-layer and electrodeposited graphene oxide/Mg substituted hydroxyapatite outer-layer on carbon/carbon composites for biomedical application

A duplex coating composed of electrophoretic deposited graphene oxide (GO) inner-layer and electrodeposited GO/Mg substituted hydroxyapatite (MH) outer-layer was prepared on carbon/carbon composites (CC). The morphology and microstructure of GO-GO/MH coating were researched by Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The bonding strength between GO-GO/MH coating and CC substrate was investigated by shear test. The in-vitro bioactivity of GO-GO/MH coating was analyzed by simulated body fluid (SBF) immersion test. The results demonstrated that electrophoretic deposited GO inner-layer was successfully introduced on CC and could serve as an interlayer between CC and following electrodeposited GO/MH outer-layer. GO/MH outer-layer presented a flake morphology with 150–250?nm in thickness and 1.5–2.5?µm in width, exhibiting porous three-dimensional networks structure uniformly. The shear test showed that the bonding strength between the duplex coating and CC reached 7.4?MPa, which was 80.49% higher than that of single-layered MH coating without GO. The duplex coating could induce the formation of flocculent and chapped apatite after SBF immersion, which demonstrated the in-vitro bioactivity of the duplex coating. These results suggested that GO-GO/MH coating might be a promising candidate in the field of biomaterials, especially for implant coatings.     

微纳米羟基磷灰石及其复合材料研究进展

寻找理想的支架材料是目前骨组织工程研究的热点。羟基磷灰石及其复合材料具有优异的生物性能和力学性能,是一类理想的骨组织工程替代材料。本文从羟基磷灰石的特点、制备科学以及其复合材料的制备科学和性质加以综述。     

我国口腔护理用品工业发展回顾与展望

对“十一百”期间中国口腔清洁护理品行业的市场及发展,口腔清洁护理品的产品技术、生产环境、生产设备、生产工艺以及标准的制定等进行了回顾。对我国“十二五”口腔清洁护理品行业的发展规划和目标进行了阐述。最后对口腔清洁护理品行业协会的工作提出了建设性的建议和要求。     

Effect of silicon and heat-treatment temperature on the morphology and mechanical properties of silicon - substituted hydroxyapatite

The precipitation method was used to synthesize silicon-substituted hydroxyapatite with different Si contents of 0.4, 0.8 and 1.6 wt.% (0.4, 0.8 and 1.6Si-HA) using silicon acetate [Si(OCOCH₃)₄] as a Si source. As-synthesized hydroxyapatite (HA) and Si-HA powders/bulks were heat-treated at different temperatures of 1150, 1200 and 1250 °C for 1 h. Pure 0.4Si-HA and 1.6Si-HA were obtained after heat-treatment at all temperatures, whilst α-TCP phase was formed in the 0.8Si-HA sample after heat-treatment at 1250 °C. SEM observation clearly showed that the substitution of Si in HA inhibited the grain growth of Si-HA even at high heat-treatment temperatures (1200 or 1250 °C). The highest diametral tensile strength (DTS) of 15.93 MPa was obtained in the 1.6Si-HA sample after heat-treatment at 1250 °C.