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Hydroxyapatite

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https://www.readbyqxmd.com/read/28430676/a-biomimetic-alternative-to-synthetic-hydroxyapatite-boron-containing-bone-like-hydroxyapatite-precipitated-from-simulated-body-fluid
#1
Mert Calis, Tugrul Tolga Demirtas, Alper Vatansever, Gulseren Irmak, Ahmet Hamdi Sakarya, Pergin Atilla, Figen Ozgur, Menemse Gumusderelioglu
BACKGROUND: Biological hydroxyapatite (HA), has several mechanical and physical advantages over the commercially available synthetic apatite (CAP-HA). The aim of this in vivo study was to investigate the effect of osteoinductive "bone-like hydroxyapatite" obtained from simulated body fluid (SBF) combined with osteoinductive "boron" (B) on bone healing. MATERIALS: Bone like nanohydroxyapatite (SBF-HA) was precipitated from 10× simulated body fluid (10×SBF). Thirty Sprague-Dawley rats were randomly divided into 5 experimental groups (n = 6 each)...
April 20, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28430344/surfactant-assisted-synthesis-of-polyvinylpyrrolidone-hydroxyapatite-composites-as-a-bone-filler
#2
Masoumeh Meskinfam Langroudi, Masoud Giahi Saravani, Azita Nouri
BACKGROUND: Different methods have been used to prepare bone-like composites from inorganic nanoparticles embedded in polymeric matrixes to obtain the properties and structures required for bone fillers. METHODS: Bone-like nano-hydroxyapatite (nHA) was synthesized using a biomimetic method, with polyvinylpyrrolidone (PVP) as template and sodium dodecyl sulfate (SDS) as surfactant. RESULTS: The results demonstrated the formation of HA composites and showed that polymer and surfactant as the polymer capsule can be properly used to control the size, shape, morphology and dispersion of HA crystals...
April 11, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28428079/mineralization-inhibiting-effects-of-transglutaminase-crosslinked-polymeric-osteopontin
#3
Betty Hoac, Valentin Nelea, Wenge Jiang, Mari T Kaartinen, Marc D McKee
Osteopontin (OPN) belongs to the SIBLING family (Small, Integrin-Binding LIgand N-linked Glycoproteins) of mineral-binding matrix proteins found in bones and teeth. OPN is a well-known inhibitor of matrix mineralization, and enzymatic modification of OPN can affect this inhibitory function. In bone, OPN exists both as a monomer and as a high-molecular-weight polymer - the latter is formed by transglutaminase-mediated crosslinking of glutamine and lysine residues in OPN to create homotypic protein assemblies...
April 17, 2017: Bone
https://www.readbyqxmd.com/read/28427685/fe3o4-hydroxyapatite-graphene-quantum-dots-as-a-novel-nano-sorbent-for-preconcentration-of-copper-residue-in-thai-food-ingredients-optimization-of-ultrasound-assisted-magnetic-solid-phase-extraction
#4
Phitchan Sricharoen, Nunticha Limchoowong, Yonrapach Areerob, Prawit Nuengmatcha, Suchila Techawongstien, Saksit Chanthai
Fe3O4/hydroxyapatite/graphene quantum dots (Fe3O4/HAP/GQDs) nanocomposite was synthesized and used as a novel magnetic adsorbent. This nanocomposite was characterized using scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and magnetization property. The Fe3O4/HAP/GQDs was applied to pre-concentrate copper residues in Thai food ingredients (so-called "Tom Yum Kung") prior to determination by inductively coupled plasma-atomic emission spectrometry...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427668/synthesis-of-hydroxyapatite-nanorods-for-application-in-water-defluoridation-and-optimization-of-process-variables-advantage-of-ultrasonication-with-precipitation-method-over-conventional-method
#5
Dhiraj Mehta, Poonam Mondal, Virendra Kumar Saharan, Suja George
This research work presents the synthesis of hydroxyapatite (Hap) nanorods for defluoridation of drinking water by using both conventional (CM) and ultrasonication with precipitation (USPM) methods. Calcium nitrate was reacted with potassium phosphate in presence of ammonia for controlled pH to synthesize Hap nanorods, which was characterized using FTIR, XRD, SEM, TG-DTA, and TEM/EDS for determining its phase composition, structural and thermal decomposition behavior. When USPM method was used for synthesis, the yield of the Hap nanorods was improved from 83...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426935/manipulation-of-mg2-ca2-switch-on-the-development-of-bone-mimetic-hydroxyapatite
#6
Nancy C Andrés, Noelia L D'Elía, Juan M Ruso, Adrián Esteban Campelo, Virginia L Massheimer, Paula V Messina
Ionic substitution can affect essential physicochemical properties leading to a specific biological behavior upon implantation. Therefore it has been proposed as a tool to increase the biological efficiency of calcium phosphate based materials. In the following study we have evaluated the contribution of an important cation in nature, Mg2+, into the structure of previously studied biocompatible and biodegradable hydroxyapatite (HA) nano-rods and its subsequent effect on its chemical, morphology and bone mimetic articulation...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28425470/graphene-oxide-as-an-interface-phase-between-polyetheretherketone-and-hydroxyapatite-for-tissue-engineering-scaffolds
#7
Shuping Peng, Pei Feng, Ping Wu, Wei Huang, Youwen Yang, Wang Guo, Chengde Gao, Cijun Shuai
The poor bonding strength between biopolymer and bioceramic has remained an unsolved issue. In this study, graphene oxide (GO) was introduced as an interface phase to improve the interfacial bonding between polyetheretherketone (PEEK) and hydroxyapatite (HAP) for tissue engineering scaffolds. On the one hand, the conjugated structure of GO could form strong π-π stacking interaction with the benzene rings in PEEK. On the other hand, GO with a negatively charge resulting from oxygen functional groups could adsorb the positively charged calcium atoms (C sites) of HAP...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424946/preparation-and-corrosion-resistance-of-magnesium-phytic-acid-hydroxyapatite-composite-coatings-on-biodegradable-az31-magnesium-alloy
#8
Min Zhang, Shu Cai, Feiyang Zhang, Guohua Xu, Fengwu Wang, Nian Yu, Xiaodong Wu
In this work, a magnesium phytic acid/hydroxyapatite composite coating was successfully prepared on AZ31 magnesium alloy substrate by chemical conversion deposition technology with the aim of improving its corrosion resistance and bioactivity. The influence of hydroxyapatite (HA) content on the microstructure and corrosion resistance of the coatings was investigated. The results showed that with the increase of HA content in phytic acid solution, the cracks on the surface of the coatings gradually reduced, which subsequently improved the corrosion resistance of these coated magnesium alloy...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28423864/adsorption-of-uranyl-ions-at-the-nano-hydroxyapatite-and-its-modification
#9
Ewa Skwarek, Agnieszka Gładysz-Płaska, Yuliia Bolbukh
Nano-hydroxyapatite and its modification, hydroxyapatite with the excess of phosphorus (P-HAP) and hydroxyapatite with the carbon ions built into the structure (C-HAP), were prepared by the wet method. They were studied by means of XRD, accelerated surface area and porosimetry (ASAP), and SEM. The size of crystallites computed using the Scherrer method was nano-hydroxyapatite (HAP) = 20 nm; P-HAP-impossible to determine; C-HAP = 22 nm; nano-HAP/U(VI) = 13.7 nm; P-HAP/U(VI)-impossible to determine, C-HAP/U(VI) = 11 nm...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28420224/silk-fibroin-alginate-hydroxyapatite-composite-particles-in-bone-tissue-engineering-applications-in-vivo
#10
You-Young Jo, Seong-Gon Kim, Kwang-Jun Kwon, HaeYong Kweon, Weon-Sik Chae, Won-Geun Yang, Eun-Young Lee, Hyun Seok
The aim of this study was to evaluate the in vivo bone regeneration capability of alginate (AL), AL/hydroxyapatite (HA), and AL/HA/silk fibroin (SF) composites. Forty Sprague Dawley rats were used for the animal experiments. Central calvarial bone (diameter: 8.0 mm) defects were grafted with AL, AL/HA, or AL/HA/SF. New bone formation was evaluated by histomorphometric analysis. To demonstrate the immunocompatibility of each group, the level of tumor necrosis factor (TNF)-α expression was studied by immunohistochemistry (IHC) and quantitative reverse transcription polymerase chain reaction (qRT-PCR) at eight weeks post implantation...
April 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28419943/interconnectivity-of-macroporous-molecularly-imprinted-polymers-fabricated-by-hydroxyapatite-stabilized-pickering-high-internal-phase-emulsions-hydrogels-for-the-selective-recognition-of-protein
#11
Yanhua Sun, Yuqing Li, Jiangfeng Xu, Ling Huang, Tianyun Qiu, Shian Zhong
Hydroxyapatite hybridized molecularly imprinted polydopamine polymers with selective recognition of bovine hemoglobin (BHb) were successfully prepared via Pickering oil-in-water high internal phase emulsions-hydrogels and molecularly imprinting technique. The emulsions were stabilized by hydroxyapatite of which the wettability was modified by 3-methacryloxypropyltrimethoxysilane. The materials were characterized by SEM, IR and TGA. The results showed that the BHb imprinted polymers based on Pickering hydrogels (Hydro-MIPs) possess macropores ranging from 20μm to 50μm, and their large numbers of amino groups and hydroxyl groups result in a favorable adsorption capacity for BHb...
April 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28418231/a-dendritic-amphiphile-for-efficient-control-of-biomimetic-calcium-phosphate-mineralization
#12
Doreen Hentrich, Soraya Taabache, Gerald Brezesinski, Nele Lange, Wolfgang Unger, Christian Kübel, Annabelle Bertin, Andreas Taubert
The phase behavior of a dendritic amphiphile containing a Newkome-type dendron as the hydrophilic moiety and a cholesterol unit as the hydrophobic segment is investigated at the air-liquid interface. The amphiphile forms stable monomolecular films at the air-liquid interface on different subphases. Furthermore, the mineralization of calcium phosphate beneath the monolayer at different calcium and phosphate concentrations versus mineralization time shows that at low calcium and phosphate concentrations needles form, whereas flakes and spheres dominate at higher concentrations...
April 18, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28416396/chitosan-composite-three-dimensional-macrospheric-scaffolds-for-bone-tissue-engineering
#13
Veena Vyas, Tejinder Kaur, Arunachalam Thirugnanam
The present work deals with the fabrication of chitosan composite scaffolds with controllable and predictable internal architecture for bone tissue engineering. Chitosan (CS) based composites were developed by varying montmorillonite (MMT) and hydroxyapatite (HA) combinations to fabricate macrospheric three dimensional (3D) scaffolds by direct agglomeration of the sintered macrospheres. The fabricated CS, CS/MMT, CS/HA and CS/MMT/HA 3D scaffolds were characterized for their physicochemical, biological and mechanical properties...
April 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28415551/a-biodegradable-az91-magnesium-alloy-coated-with-a-thin-nanostructured-hydroxyapatite-for-improving-the-corrosion-resistance
#14
T M Mukhametkaliyev, M A Surmeneva, A Vladescu, C M Cotrut, M Braic, M Dinu, M D Vranceanu, I Pana, M Mueller, R A Surmenev
The main aim of this study was to investigate the properties of an AZ91 alloy coated with nanostructured hydroxyapatite (HA) prepared by radio frequency (RF) magnetron sputtering. The bioactivity and biomineralization of the AZ91 magnesium alloy coated with HA were investigated in simulated body fluid (SBF) via an in vitro test. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) analyses were performed. The samples were immersed in SBF to study the ability of the surface to promote the formation of an apatite layer as well as corrosion resistance and mass change of the HA-coated AZ91 alloy...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415549/the-precursors-effects-on-biomimetic-hydroxyapatite-ceramic-powders
#15
Afife Binnaz Hazar Yoruç, Aysu Aydınoğlu
In this study, effects of the starting material on chemical, physical, and biological properties of biomimetic hydroxyapatite ceramic powders (BHA) were investigated. Characterization and chemical analysis of BHA powders were performed by using XRD, FT-IR, and ICP-AES. Microstructural features such as size and morphology of the resulting BHA powders were characterized by using BET, nano particle sizer, pycnometer, and SEM. Additionally, biological properties of the BHA ceramic powders were also investigated by using water-soluble tetrazolium salts test (WST-1)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415548/in-vitro-evaluation-of-ag-containing-calcium-phosphates-effectiveness-of-ag-incorporated-%C3%AE-tricalcium-phosphate
#16
Ozkan Gokcekaya, Kyosuke Ueda, Kouetsu Ogasawara, Hiroyasu Kanetaka, Takayuki Narushima
Development of bioceramics with antibacterial activity and without cytotoxicity would be beneficial for preventing infection associated with implants. This study aimed to capitalize on the antibacterial properties of silver (Ag) incorporated in or coexisting in metallic form with calcium phosphates (CaPs). The in vitro dissolution behavior, antibacterial activity, and cytotoxicity of Ag-containing CaPs with different phase fractions of hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) were evaluated...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415537/potassium-doped-mesoporous-bioactive-glass-synthesis-characterization-and-evaluation-of-biomedical-properties
#17
Muhammad Shoaib, Aamer Saeed, Javeed Akhtar, Muhammad Saif Ur Rahman, Aman Ullah, Klaus Jurkschat, Muhammad Moazzam Naseer
A bifunctional mesoporous bioactive glass (MBG) with composition (49SiO2·20CaO·20Na2O·7K2O·4P2O5 mol%) was synthesized by a facile sol-gel method, using polyethylene glycol (PEG 6000) as a soft template. The structure, morphology (spherical with approximate size 1μm) and composition of MBG were determined by fourier transform infrared spectroscopy, the scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), respectively. The surface area (189.53m(2)g(-1) with the pore size of 21nm) of MBG was measured by Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) analysis...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415534/influence-of-si-substitution-on-the-reactivity-of-%C3%AE-tricalcium-phosphate
#18
Mariana Motisuke, Gemma Mestres, Caroline O Renó, Raúl G Carrodeguas, Cecília A C Zavaglia, Maria-Pau Ginebra
Silicon substituted calcium phosphates have been widely studied over the last ten years due to their enhanced osteogenic properties. Notwithstanding, the role of silicon on α-TCP reactivity is not clear yet. Therefore, the aim of this work was to evaluate the reactivity and the properties of Si-α-TCP in comparison to α-TCP. Precursor powders have similar properties regarding purity, particle size distribution and specific surface area, which allowed a better comparison of the Si effects on their reactivity and cements properties...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415533/enhanced-mechanical-properties-and-biocompatibility-of-novel-hydroxyapatite-topas-hybrid-composite-for-bone-tissue-engineering-applications
#19
Qurat Ul Ain, Ahmad Nawaz Khan, Mahboubeh Nabavinia, Mohammad Mujahid
The bioactivity and mechanical properties of hybrid composites of hydroxyapatite (HA) in cyclic olefinic copolymer (COC) also known commercially as TOPAS are investigated, first time, for regeneration and repair of the bone tissues. HA is synthesized to obtain the spherically shaped nanoparticles in the size range of 60±20nm. Various concentrations of HA ranging from 1 to 30wt% are dispersed in TOPAS using sodium dodecyl sulfate (SDS) coupling agent for better dispersion and interaction of hydrophilic HA with hydrophobic TOPAS...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415532/preparation-of-micro-porous-bioceramic-containing-silicon-substituted-hydroxyapatite-and-beta-tricalcium-phosphate
#20
Lih-Jyh Fuh, Ya-Jing Huang, Wen-Cheng Chen, Dan-Jae Lin
Dimensional instability caused by sintering shrinkage is an inevitable drawback for conventional processing of hydroxyapatite (HA). A new preparation method for biphasic calcium phosphates was developed to increase micro pores and biodegradation without significant dimensional change. Powder pressed HA discs, under 100MPa, were immersed in a colloidal mixture of tetraethoxysilane (TEOS) and ammonium hydroxide for 10min, followed by drying, and then were sintered at 900°C, 1050°C, and 1200°C, respectively...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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