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Nakamura M, Aizawa H, Kawabata H, Sato A, Watanabe T, Isobe K, Kitamura Y, Tanaka T, Kawase T. Platelet adhesion on commercially pure titanium plates in vitro III: effects of calcium phosphate-blasting on titanium plate biocompatibility. Int J Implant Dent 2020; 6:74. [PMID: 33215329 PMCID: PMC7677422 DOI: 10.1186/s40729-020-00270-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 10/25/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Platelet-rich plasma (PRP) is often used to improve surface biocompatibility. We previously found that platelets rapidly adhere to plain commercially pure titanium (cp-Ti) plates in the absence, but not in the presence, of plasma proteins. To further expand on these findings, in the present study, we switched titanium plates from a plain surface to a rough surface that is blasted with calcium phosphate (CaP) powder and then examined platelet adhesion and activation. METHODS Elemental distribution in CaP-blasted cp-Ti plates was analyzed using energy-dispersive X-ray spectroscopy. PRP samples prepared from anticoagulated blood samples of six healthy, non-smoking adult male donors were loaded on CaP-blasted cp-Ti plates for 1 h and fixed for examination of platelet morphology and visualization of PDGF-B and platelet surface markers (CD62P, CD63) using scanning electron microscopy and fluorescence microscopy. Plain SUS316L stainless steel plates used in injection needles were also examined for comparison. RESULTS Significant amounts of calcium and phosphate were detected on the CaP-blasted cp-Ti surface. Platelets rapidly adhered to this surface, leading to higher activation. Platelets also adhered to the plain stainless surface; however, the levels of adhesion and activation were much lower than those observed on the CaP-blasted cp-Ti plate. CONCLUSIONS The CaP-blasted cp-Ti surface efficiently entraps and activates platelets. Biomolecules released from the activated platelets could be retained by the fibrin matrix on the surface to facilitate regeneration of the surrounding tissues. Thus, PRP immersion could not only eliminate surface air bubbles but also improve the biocompatibility of the implant surface.
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Affiliation(s)
| | | | | | - Atsushi Sato
- Tokyo Plastic Dental Society, Kita-ku, Tokyo, Japan
| | | | | | | | - Takaaki Tanaka
- Department of Materials Science and Technology, Niigata University, Niigata, Japan
| | - Tomoyuki Kawase
- Division of Oral Bioengineering, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan.
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Lin Z, Hu R, Zhou J, Ye Y, Xu Z, Lin C. A further insight into the adsorption mechanism of protein on hydroxyapatite by FTIR-ATR spectrometry. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:527-531. [PMID: 27744063 DOI: 10.1016/j.saa.2016.09.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 08/24/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
The adsorption mechanism of bovine serum albumin (BSA) on hydroxyapatite (HA) for different time intervals has been studied by Fourier transform infrared (FTIR)-attenuated total internal reflectance (ATR) spectrometry in this paper. The difference spectra obtained in HA and BSA frequency regions demonstrate that the binding of PO, from the phosphate (PO43-) of HA, to the hydrogen of methyl (-CH3), methene (-CH2) and amideII (-CNH) in the protein appears to be much faster and stronger than that of the PO group. In addition, Ca2+ must serve as a key role in the interaction of BSA with HA. The binding of Ca2+ to the oxygen of the peptide bond seems to induce a significant reconformation of polypeptide backbones from β-pleated sheet to α-helix and β-turn of helical circles. This alteration seems to have been accompanied by much hydrogen of polypeptides driven to bind PO43- and OH- of the HA actively and much -C=O and HN groups of the peptide bond freed from inter-chain hydrogen bonding to react on Ca2+ and combine strongly with the HA surface. This might be well expected to promote the HA biomineralization.
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Affiliation(s)
- Zhongyu Lin
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China.
| | - Ren Hu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China
| | - Jianzhang Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China
| | - Yiwen Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China
| | - Zhaoxi Xu
- Xiamen A ER TE System Engineering CO., LTD, Xiamen 361005, PR China
| | - Changjian Lin
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China
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Huang J, Wang L, Liu B, Wan S, Xue Q. In vitro evaluation of the tribological response of Mo-doped graphite-like carbon film in different biological media. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2772-2783. [PMID: 25580834 DOI: 10.1021/am507850r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Complicated tribochemical reactions with the surrounding media often occur at the prosthesis material, which is a dominant factor causing the premature failure in revision surgery. Graphite-like carbon (GLC) film has been proven to be an excellent tribological adaption to water-based media, and this work focused on the friction and wear behavior of Mo-doped GLC (Mo-GLC)-coated poly(aryl ether ether ketone) sliding against Al2O3 counterpart in physiological saline, simulated body fluid, and fetal bovine serum (FBS), which mainly emphasized the interface interactions of the prosthetic materials/lubricant. Results showed different tribological responses of Mo-GLC/Al2O3 pairs strongly correlated with the interfacial reactions of the contacting area. Particularly, a transfer layer was believed to be responsible for the excellent wear reduction of Mo-GLC/Al2O3 pair in FBS medium, in which graphitic carbon and protein species were contained. The wear mechanisms are tentatively discussed according to the morphologies and chemical compositions of the worn surfaces examined by scanning electron microscope as well as X-ray photoelectron spectroscopy.
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Affiliation(s)
- Jinxia Huang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou, 730000, P. R. China
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De Wilde EA, Jimbo R, Wennerberg A, Naito Y, Coucke P, Bryington MS, Vandeweghe S, De Bruyn H. The Soft Tissue Immunologic Response to Hydroxyapatite-Coated Transmucosal Implant Surfaces: A Study in Humans. Clin Implant Dent Relat Res 2013; 17 Suppl 1:e65-74. [DOI: 10.1111/cid.12128] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Elisabeth A.W.J. De Wilde
- Department of Periodontology & Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; University of Ghent; Ghent Belgium
| | - Ryo Jimbo
- Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden
| | - Ann Wennerberg
- Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden
| | - Yoshihito Naito
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology; Institute of Health Biosciences; The University of Tokushima Graduate School; Tokushima Japan
- Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden
| | - Paul Coucke
- Center for Medical Genetics; Faculty of Medicine and Health Sciences; Ghent University Hospital; Ghent Belgium
| | - Matthew S. Bryington
- Department of Restorative and Prosthetic Dentistry; The Ohio State University College of Dentistry; Columbus OH USA
| | - Stefan Vandeweghe
- Department of Periodontology & Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; University of Ghent; Ghent Belgium
| | - Hugo De Bruyn
- Department of Periodontology & Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; University of Ghent; Ghent Belgium
- Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden
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Lopez-Heredia MA, Pattipeilohy J, Hsu S, Grykien M, van der Weijden B, Leeuwenburgh SCG, Salmon P, Wolke JGC, Jansen JA. Bulk physicochemical, interconnectivity, and mechanical properties of calcium phosphate cements-fibrin glue composites for bone substitute applications. J Biomed Mater Res A 2012; 101:478-90. [DOI: 10.1002/jbm.a.34342] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 05/22/2012] [Accepted: 06/28/2012] [Indexed: 12/25/2022]
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Gruian C, Vanea E, Simon S, Simon V. FTIR and XPS studies of protein adsorption onto functionalized bioactive glass. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:873-81. [DOI: 10.1016/j.bbapap.2012.04.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 02/07/2012] [Accepted: 04/24/2012] [Indexed: 10/28/2022]
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Wang K, Zhou C, Hong Y, Zhang X. A review of protein adsorption on bioceramics. Interface Focus 2012; 2:259-77. [PMID: 23741605 DOI: 10.1098/rsfs.2012.0012] [Citation(s) in RCA: 163] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 02/28/2012] [Indexed: 11/12/2022] Open
Abstract
Bioceramics, because of its excellent biocompatible and mechanical properties, has always been considered as the most promising materials for hard tissue repair. It is well know that an appropriate cellular response to bioceramics surfaces is essential for tissue regeneration and integration. As the in vivo implants, the implanted bioceramics are immediately coated with proteins from blood and body fluids, and it is through this coated layer that cells sense and respond to foreign implants. Hence, the adsorption of proteins is critical within the sequence of biological activities. However, the biological mechanisms of the interactions of bioceramics and proteins are still not well understood. In this review, we will recapitulate the recent studies on the bioceramic-protein interactions.
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Affiliation(s)
- Kefeng Wang
- National Engineering Research Center for Biomaterials , Sichuan University , 610064 Chengdu , People's Republic of China
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8
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Sweity A, Ying W, Belfer S, Oron G, Herzberg M. pH effects on the adherence and fouling propensity of extracellular polymeric substances in a membrane bioreactor. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.04.056] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Bazaka K, Jacob MV, Crawford RJ, Ivanova EP. Plasma-assisted surface modification of organic biopolymers to prevent bacterial attachment. Acta Biomater 2011; 7:2015-28. [PMID: 21194574 DOI: 10.1016/j.actbio.2010.12.024] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 12/01/2010] [Accepted: 12/20/2010] [Indexed: 12/30/2022]
Abstract
Despite many synthetic biomaterials having physical properties that are comparable or even superior to those of natural body tissues, they frequently fail due to the adverse physiological reactions they cause within the human body, such as infection and inflammation. The surface modification of biomaterials is an economical and effective method by which biocompatibility and biofunctionality can be achieved while preserving the favorable bulk characteristics of the biomaterial, such as strength and inertness. Amongst the numerous surface modification techniques available, plasma surface modification affords device manufacturers a flexible and environmentally friendly process that enables tailoring of the surface morphology, structure, composition, and properties of the material to a specific need. There are a vast range of possible applications of plasma modification in biomaterial applications, however, the focus of this review paper is on processes that can be used to develop surface morphologies and chemical structures for the prevention of adhesion and proliferation of pathogenic bacteria on the surfaces of in-dwelling medical devices. As such, the fundamental principles of bacterial cell attachment and biofilm formation are also discussed. Functional organic plasma polymerised coatings are also discussed for their potential as biosensitive interfaces, connecting inorganic/metallic electronic devices with their physiological environments.
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Affiliation(s)
- Kateryna Bazaka
- Electronic Materials Research Laboratory, School of Engineering and Physical Sciences, James Cook University, Townsville, Queensland, Australia
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Bacterial Extracellular Polysaccharides. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2011; 715:213-26. [DOI: 10.1007/978-94-007-0940-9_13] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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Hing KA, Revell PA, Smith N, Buckland T. Effect of silicon level on rate, quality and progression of bone healing within silicate-substituted porous hydroxyapatite scaffolds. Biomaterials 2006; 27:5014-26. [PMID: 16790272 DOI: 10.1016/j.biomaterials.2006.05.039] [Citation(s) in RCA: 295] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Accepted: 05/15/2006] [Indexed: 11/24/2022]
Abstract
The osseous response to silicon (Si) level (0, 0.2, 0.4, 0.8 and 1.5 wt% Si) within 5 batches of matched porosity silicate-substituted hydroxyapatite (SA) scaffold was assessed by implantation of 4.6 mm diameter cylinders in the femoral intercondylar notch of New Zealand White rabbits for periods of 1, 3, 6 and 12 weeks. Histological evaluation and histomorphometric quantification of bone ingrowth and mineral apposition rate (MAR) demonstrated the benefits to early (<1 week) bone ingrowth and repair through incorporation of Si, at all levels, in porous hydroxyapatite (HA) lattices as compared to stoichiometric (0 wt% Si) HA. The group containing 0.8 wt% Si supported significantly more bone ingrowth than all other groups at 3 and 6 weeks (P<0.05), initially through its elevated MAR between weeks 1 and 2, which was significantly higher than that of all other Si-containing groups (P<0.05). The level of silicate substitution also influenced the morphology and stability of the repair, with elevated levels of bone resorption and apposition apparent within other Si-containing groups at timepoints >3 weeks as compared to the 0 and 0.8 wt% Si groups. At 12 weeks, the net amount of bone ingrowth continued to rise in the 0, 0.8 and 1.5 wt% groups, apparently as a result of adaptive remodelling throughout the scaffold. Ingrowth levels remained highest in the 0.8 wt% Si group, was characterised by a dense trabecular morphology in the superficial region graduating to a more open network in the deep zone. These results highlight the sensitivity of healing response to Si level and suggest that an optimal response is obtained when SA is substituted with 0.8 wt% Si through its effect on the activity of both bone forming and bone resorbing cells.
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Affiliation(s)
- Karin A Hing
- Department of Materials, IRC in Biomedical Materials, Queen Mary University of London, London E14NS, UK.
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12
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Ma S, Yang Y, Carnes DL, Kim K, Park S, Oh SH, Ong JL. Effects of dissolved calcium and phosphorous on osteoblast responses. J ORAL IMPLANTOL 2005; 31:61-7. [PMID: 15871524 DOI: 10.1563/0-742.1] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The dissolution behavior of hydroxyapatite (HA) and its effect on the initial cellular response is of both fundamental and clinical importance. In this study, plasma-sprayed HA coatings were characterized by X-ray diffraction and Fourier transform infrared spectroscopy (FTIR). Calcium (Ca) and inorganic phosphorous (Pi) ions released from plasma-sprayed HA coatings within 3 weeks were measured by flame atomic absorption and colorimetrically molybdenum blue complex, respectively. To investigate the effect of dissolution of HA coatings on osteoblast response, additional Ca and Pi were added into the cell culture media to simulate the dissolution concentrations. Human embryonic palatal mesenchyme cells, an osteoblast precursor cell line, were used to evaluate the biological responses to enhanced Ca and Pi media over 2 weeks. Osteoblast differentiation and mineralization were measured by alkaline phosphatase-specific assay and 1,25 (OH)2 vitamin D3 stimulated osteocalcin production. The coatings exhibited an HA-type structure. FTIR indicated the possible presence of carbonates on the coatings. A dissolution study indicated a continual increase in Ca and Pi over time. In the cell culture study, enhanced osteoblast differentiation occurred in the presence of additional Ca concentration in the cell culture media. However, additional Pi concentration in the cell culture media was suggested to slow down osteoblast differentiation and mineralization.
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Affiliation(s)
- S Ma
- School of Dentistry, University of Texas Health Science Center at San Antonio, USA
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13
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Feng B, Chen J, Zhang X. Interaction of calcium and phosphate in apatite coating on titanium with serum albumin. Biomaterials 2002; 23:2499-507. [PMID: 12033597 DOI: 10.1016/s0142-9612(01)00384-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A Ca-deficient carbonate apatite coating on titanium was prepared by pre-calcifying titanium in a saturated Ca(OH)2 solution and then immersing in a supersaturated calcium phosphate solution. The interaction of the protein with the apatite coating on titanium was investigated by scanning electron microscopy with X-ray energy dispersion spectroscopy. X-ray photoelectron spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy. During immersion of the coating in bovine serum albumin (BSA) solution, accompanied by an adsorption of BSA onto the coating, calcium and phosphate ions dissolved and reprecipitated, resulting in the formation of the coating containing BSA from the surface to subsurface layers. The adsorption modified the structure and morphology of the apatite coating on titanium and changed the protein configuration. It was also found that the protein chemically adsorbed onto surfaces containing calcium or phosphorus, showed that both Ca and P on the apatite coating were the binding sites with protein. The BSA adsorption onto the coating involved several elements and groups. In this process. Ca played an essential role, and the interaction of Ca on the apatite coating with the protein stimulated the bond of the protein at P sites.
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Affiliation(s)
- Bo Feng
- Engineering Research Center in Biomaterials, Sichuan University, Chengdu, China.
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Ong JL, Bessho K, Cavin R, Carnes DL. Bone response to radio frequency sputtered calcium phosphate implants and titanium implants in vivo. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2002; 59:184-90. [PMID: 11745552 DOI: 10.1002/jbm.1232] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The objective of this study was to evaluate the effect of radio frequency sputtered calcium phosphate (CaP) coatings of titanium (Ti) implants on the bond strength at the bone-implant interface and percent bone contact length. Cylindrical coated or noncoated implants (4.0-mm diameter by 8-mm long) were implanted for 3 and 12 weeks. At 3 weeks after implant placement, the ultimate interfacial strengths for as-deposited CaP-coated and heat-treated CaP-coated implants were 2.29 +/- 0.14 MPa and 1.28 +/- 0.04 MPa, respectively. These ultimate interfacial strength values at 3 weeks were statistically greater than the mean ultimate interfacial strength for control Ti implants (0.67 +/- 0.13 MPa). At 12 weeks after implant placement, no statistical differences in the mean ultimate interfacial strengths were observed between the as-deposited CaP-coated, heat-treated CaP-coated, and control Ti implants. Histomorphometric evaluation indicated greater percent bone contact lengths for the as-deposited CaP-coated implants compared with the heat-treated CaP-coated and control Ti implants 3 and 12 weeks after implant placement.
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Affiliation(s)
- J L Ong
- Department of Restorative Dentistry, Division of Biomaterials, University of Texas Health Science Center at San Antonio, Texas 78284-7890, USA.
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Xie J, Riley C, Chittur K. Effect of albumin on brushite transformation to hydroxyapatite. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:357-65. [PMID: 11523030 DOI: 10.1002/1097-4636(20011205)57:3<357::aid-jbm1178>3.0.co;2-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Brushite (CaHPO(4) x 2H(2)O) is a precursor to hydroxyapatite [HA, Ca(5)(PO(4))(3)OH]. It has been shown that a modified form of brushite, with potassium substituting for calcium at specific sites, demonstrated accelerated transformation to HA when exposed to nonproteinaceous Hanks' balanced aqueous salt solutions (HBSS). The biocompatibility of a transforming material is related to cellular response to the process, which is initiated by protein adsorption. The effect of adsorbed protein on the kinetics and chemistry of brushite transformation to HA, when exposed to HBSS containing bovine serum albumin (BSA), was examined using Fourier transform IR spectroscopy, X-ray diffraction, and energy dispersive spectrometry techniques. The effect of solution pH was also studied. Results show that, in the presence of a protein-free environment, transformation is faster in buffered medium than in nonbuffered medium. Moreover, curve fitting and second derivatives of the IR spectra show that some bands shift depending on whether the brushite transforms in a buffered or nonbuffered medium. Therefore, variation in pH affects both transformation rate and the associated chemistry. The presence of BSA in either buffered or nonbuffered medium retards the transformation in comparison to the corresponding BSA-free medium. The extent of this retardation increases with the increase in bulk concentration of BSA but does not alter the transformation chemistry. This suggests the retardation on the transformation rate is due to BSA adsorption coverage on the calcium phosphate ceramic. This may be due to the shielding of Ca(2+) and PO(4)(-3) sites, preventing their interaction with the HBSS.
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Affiliation(s)
- J Xie
- Materials Science Program and Chemistry Department, The University of Alabama-Huntsville, Huntsville, Alabama 35899, USA
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Jian Z, Zajac R, Chakrabarti A, Dyakonov T, Guo X, Sorensen C, Burns D, Stevenson WTK. Trends in the adsorption of mono-end-capped polystyrenes onto polar substrates: Theoretical predictions and experimental observations. J Appl Polym Sci 2000. [DOI: 10.1002/(sici)1097-4628(20000531)76:9<1422::aid-app7>3.0.co;2-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The dissolution behavior of hydroxyapatite (HA) in the presence and absence of protein needs to be investigated in order to fully understand the initial cellular response to HA surfaces. In this study, HA coatings were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy (FTIR) prior to protein study. Fibronectin and albumin adsorption study were also performed. Calcium and phosphorus released in the presence and absence of albumin were measured. pH of the solution was measured daily. From the materials characterization, it was observed that the coatings exhibit a HA-type structure, with traces of sodium on the surface. FTIR indicated the possible presence of carbonates on the coatings. From the adsorption study, the amount of albumin adsorbed (0.052+/-0.005 microg/mm2) was statistically higher than the amount of fibronectin adsorbed on HA surfaces (0.035+/-0.002 microg/mm2). Flame atomic absorption indicated a significantly higher calcium ions released initially for HA coatings incubated with proteins as compared to coatings in the absence of proteins. However, after 7 days incubation, no significant difference in calcium ions release was observed between the HA coatings in the presence and absence of proteins. Phosphorus dissolution on HA coatings was not significantly affected by the presence of proteins. Thus, it was suggested from this study that the initial dissolution properties of calcium ions from HA coatings was dependent on the media.
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Affiliation(s)
- S A Bender
- Department of Restorative Dentistry, University of Texas Health Science Center at San Antonio, 78284-7890, USA
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Park HY, Song IH, Kim JH, Kim WS. Preparation of thermally denatured albumin gel and its pH-sensitive swelling. Int J Pharm 1998. [DOI: 10.1016/s0378-5173(98)00289-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Pantazaki A, Baron MH, Revault M, Vidal-Madjar C. Characterization of Human Serum Albumin Adsorbed on a Porous Anion-Exchange Support. J Colloid Interface Sci 1998; 207:324-331. [PMID: 9792776 DOI: 10.1006/jcis.1998.5782] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fourier transform infrared (FTIR) spectroscopy and high-performance liquid chromatography (HPLC) were used to study the adsorption behavior of human serum albumin (HSA) onto a polymer-layer type anion exchanger, poly(vinylimidazole) (PVI) adsorbed and cross-linked on a porous silica support. The data are compared with previous results for HSA adsorbed on C6 alkyl chains grafted on the same silica matrix. For the adsorption onto the PVI support from a phosphate buffer solution of low ionic strength (pD 7.4), the FTIR experiments reveal only very weak structural and solvation changes. A large fraction of the protein remains irreversibly adsorbed and the amount retained at equilibrium is close to that observed for the adsorption on the reversed-phase support, although the structural effect of the stationary phase was much larger with the grafted C6 alkyl chains. Comparing to the solution state, only 2% of the HSA backbone is modified by adsorption on PVI, whereas 12% alterations are involved for the protein adsorbed on the reversed-phase support. When adsorbed from an eluent containing 20% acetonitrile, the amount of HSA retained by the PVI ion exchanger is about twice that measured with the buffer alone. This result is explained by a more compact structure of the protein when dissolved in the organoaqueous solvent. The presence of acetonitrile does not markedly affect the elution front of HSA adsorbed on the charged hydrophilic adsorbent. This result contrasts with the much lower apparent adsorption rate observed when HSA is adsorbed on the grafted alkyl chain support in the presence of acetonitrile in the buffer. Copyright 1998 Academic Press.
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Affiliation(s)
- A Pantazaki
- Laboratory of Biochemistry, Aristotle University of Thessaloniki, Thessaloniki, 54006, Greece
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Strawn SE, White JM, Marshall GW, Gee L, Goodis HE, Marshall SJ. Spectroscopic changes in human dentine exposed to various storage solutions--short term. J Dent 1996; 24:417-23. [PMID: 8990687 DOI: 10.1016/0300-5712(95)00106-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OBJECTIVES Tooth storage conditions in studies of dentine have not been standardized. The objective of this investigation was to determine the effects of storage solution and time on dentine, using spectroscopic methods. METHODS Twenty-seven dentine disks (0.75 mm thick) were prepared from freshly extracted third molars with documented histories. The teeth were sectioned parallel to the occlusal plane using a diamond saw. Specimens were analysed non-destructively for surface chemical changes using specular reflectance infra-red Fourier transform spectroscopy (SRIFTS), and changes in optical properties were measured in the ultraviolet, visible and near-infra-red spectral ranges with an integrating sphere spectrophotometer (UV/VIS/NIR) before and after storage. A minimum of five specimens were stored in distilled water with 0.02% thymol, purified and filtered water, phosphate buffered saline with 0.02% thymol, 70% ethanol or 10% buffered formalin and evaluated at 0, 1, 2, 7, 14, 21 and 28 days. After each measurement, specimens were stored in fresh solutions. IR spectra were obtained from 4400 to 400 wave-numbers (cm-1). Optical properties of reflectance and transmittance were determined from 200 to 2500 nm, and absorbance was calculated. RESULTS Analysis of the IR spectra indicated no significant differences in collagen or mineral peak positions for any solution at any time period. There were significant differences in peak intensities of dentine stored in distilled water, purified and filtered water and phosphate-buffered saline over time in the IR spectra. Furthermore, differences in optical properties of dentine disks were detected by UV/VIS/NIR. CONCLUSION It was concluded that changes in surface chemistry and optical properties of dentine occur as a function of storage solution and time, which must be considered when studying dentine.
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Affiliation(s)
- S E Strawn
- Department of Restorative Dentistry, University of California, San Francisco 94143-0758, USA
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