Electron spin resonance in silicon substituted apatite and tricalcium phosphate

Pietak, Alexis; Reid, Joel W.; Sayer, M.

doi:10.1016/j.biomaterials.2004.10.013

Cited by 23 publications

(8 citation statements)

References 17 publications

(37 reference statements)

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“…Several active species from a defect in hydroxyapatite were also found at g = 2.0019 for a singlet of an electron at the OH vacancy and g = 2.0018 and 2.0683 for the doublet of the oxygen anion radical interacting with neighboring OH. The ESR signals at the holes of the carbonate ion and phosphate ion were observed at g = 2.0034, 2.0018, and 1.9971 and g = 2.030, 2.0062, and 2.014, respectively 39,40 . According to the similarity of ESR signals in this work and the signal from the hole at the phosphate ion, the phosphate radical seems to be an active species occurring during combustion.…”

Section: Resultsmentioning

confidence: 98%

Synthesis of Hydroxyapatite with Antibacterial Properties Using a Microwave-Assisted Combustion Method

Lamkhao

Phaya

Jansakun

et al. 2019

Sci Rep

104

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The prevention of implant-associated infections has been increasing clinically in orthopedic surgery. Hydroxyapatite with antibacterial properties was synthesized using a microwave-assisted combustion method. High crystallinity at low temperature can be achieved using this method. The synthesized hydroxyapatite exhibited a superior clear zone for both Gram-positive and Gram-negative bacteria. Electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) were used for the radical investigation. The application of intelligent ink testing and an antioxidant assay using DPPH reduction were also used to confirm the existence of radicals. These techniques provided data confirming that radicals are responsible for the antibacterial properties. The synthesized antibacterial hydroxyapatite would be a good candidate for the prevention any infection with medical implants and injection materials causing failure in bone repair.

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Section: Resultsmentioning

confidence: 98%

Synthesis of Hydroxyapatite with Antibacterial Properties Using a Microwave-Assisted Combustion Method

Lamkhao

Phaya

Jansakun

et al. 2019

Sci Rep

104

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“…To describe the spectrum of T1 sample, one more line with g iso = 2.0026 is needed. Isotropic lines in the range of 2.002–2.003 have been repeatedly observed in the annealed or mechanically treated HAP ( g = 2.0019 (F-centers—electron localized on hydroxyl group vacancy) [ 25 ], g = 2.002 (unknown center) [ 26 ], g = 2.0029 (unknown center) [ 25 ], and g = 2.0032 (unknown center) [ 27 ]). The absence of hyperfine interaction features complicates the unambiguous identification of isotropic lines.…”

Section: Resultsmentioning

confidence: 99%

Structure of Biocompatible Coatings Produced from Hydroxyapatite Nanoparticles by Detonation Spraying

et al. 2015

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Detonation-produced hydroxyapatite coatings were studied by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Raman spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. The source material for detonation spraying was a B-type carbonated hydroxyapatite powder. The coatings consisted of tetracalcium phosphate and apatite. The ratio depended slightly on the degree of crystallinity of the initial powder and processing parameters of the coating preparation. The tetracalcium phosphate phase was homogeneous; the apatite phase contained defects localized on the sixfold axis and consisted of hydroxyapatite and oxyapatite. Technological factors contributing to the transformation of hydroxyapatite powder structure during coating formation by detonation spraying are discussed.

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“…2 Si-TCP, a phase mixture of calcium phosphates containing Si, which has an ␣-TCP-like phase as its majority component shows great promise as a bone substitute that takes part in the body's natural bone remodeling process. [3][4][5][6][7][8] Ab initio methods based on density functional theory have been used to investigate the atomic arrangements and electronic structures of ␣-and ␤-TCPs. 9 The findings support the picture of robust tetrahedral PO 4 ions linked in complicated ways by Ca ions.…”

Section: Introductionmentioning

confidence: 99%

Surface and adsorption properties of α-tricalcium phosphate

Yin

Stott

2006

The Journal of Chemical Physics

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The interaction between bone replacement bioceramic materials and the body will take place at the surface of the material. In the present ab initio study, we have investigated surfaces of biologically important alpha-tricalcium phosphate (TCP) and adsorption of biological species including a Ca atom, an H2O molecule, and a SiO2 fragment on the surfaces. The results show that all these species adsorb on the surfaces. The Ca atoms are strongly chemisorbed with newly created Ca-O bonds similar to those in alpha-TCP bulk in bond length; a water molecule is adsorbed and in some cases also dissociated on the surfaces with the dissociative adsorption, the predominant process; a SiO2 fragment initially linear, strongly interacted with two oxygens of different PO4 groups and eventually forms a tetrahedral SiO4-like species which might be a precursor of the silicate present in Si-TCP materials.

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Electron spin resonance in silicon substituted apatite and tricalcium phosphate

Cited by 23 publications

References 17 publications

Synthesis of Hydroxyapatite with Antibacterial Properties Using a Microwave-Assisted Combustion Method

Synthesis of Hydroxyapatite with Antibacterial Properties Using a Microwave-Assisted Combustion Method

Structure of Biocompatible Coatings Produced from Hydroxyapatite Nanoparticles by Detonation Spraying

Surface and adsorption properties of α-tricalcium phosphate

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