951 lines
80 KiB
Text
951 lines
80 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<h1 class="nist-page__title">Electron Paramagnetic Resonance Study of Carbonated Hydroxyapatite Synthesized through Calcium Phosphate Cements</h1>
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<div class="nist-field__label">Published</div>
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<div class="nist-field__item"><time datetime="2022-08-05T12:00:00Z">August 5, 2022</time>
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<div class="nist-field__item"><span class="nist-author">Alline F. Myers</span>, Shozo Takagi, Stanislav Frukhtbeyn, Laurence Chow, <span class="nist-author">Veronika Szalai</span>, <span class="nist-author">Lonnie Cumberland</span>, <span class="nist-author">Ileana Pazos</span>, Eaman Karim</div>
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<h3>Abstract</h3>
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Ionizing radiation-induced paramagnetic defects in calcified tissues like tooth enamel are indicators of irradiation dose. Hydroxyapatite (HA), the principal constituent in these materials, incorporates a variety of anions (CO32, F, Cl, SiO44 ) and cations (Mn2+, Li+, Cu2+, Fe3+, Mg2+) that directly or indirectly contribute to formation of stable paramagnetic centers upon irradiation. Here, we used an underexploited synthesis method based on the ambient-temperature setting reaction of a self-hardening calcium phosphate cement (CPC) to create carbonate-containing hydroxyapatite (CHA) and investigate its paramagnetic properties following -irradiation. Powder X-ray diffraction and IR spectroscopic characterization of the hardened CHA samples indicate formation of pure B-type CHA cement with a low degree of crystallinity. CHA samples exposed to -radiation doses ranging from 10-3 kGy to 102 kGy exhibited an EPR signal from an orthorhombic CO2• free radical. At -radiation doses from 30 kGy to 150 kGy, a second signal emerged that is assigned to the CO3• free radical. We observed that formation of this second species is dose-dependent, which provided a means to extend the useful dynamic range of irradiated CHA to doses > 30 kGy. These results indicate that CHA synthesized via a CPC cement is a promising substrate for EPR-based dosimetry. Further studies on the CHA cement are underway to determine the suitability of these materials for a range of biological and industrial dosimetry applications.
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<div class="nist-field__item">Inorganic Chemistry</div>
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<div class="nist-field__item"><a href="https://doi.org/10.1021/acs.inorgchem.2c01177" target="_blank">https://doi.org/10.1021/acs.inorgchem.2c01177</a></div>
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<h3 class="nist-field__label">Keywords</h3>
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<div class="nist-field__item">Calcium phosphate cement, Carbonated hydroxyapatite cement, Electron paramagnetic resonance dosimetry, Bio-dosimetry, Setting reactions of calcium phosphate cement (CPC) method</div>
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<a href="/topic-terms/spectroscopy" hreflang="en">Spectroscopy</a>, <a href="/topic-terms/radiation" hreflang="en">Radiation</a>, <a href="/topic-terms/magnetics" hreflang="en">Magnetics</a> and <a href="/topic-terms/ceramics" hreflang="en">Ceramics</a></div>
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Myers, A.
|
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, Takagi, S.
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, Frukhtbeyn, S.
|
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, Chow, L.
|
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, Szalai, V.
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, Cumberland, L.
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, Pazos, I.
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and Karim, E.
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(2022),
|
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Electron Paramagnetic Resonance Study of Carbonated Hydroxyapatite Synthesized through Calcium Phosphate Cements, Inorganic Chemistry, [online], https://doi.org/10.1021/acs.inorgchem.2c01177, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934255
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(Accessed March 4, 2025)
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Created August 5, 2022, Updated November 29, 2022
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