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Article: Solubility of TTCP and β-TCP by solid titration

TitleSolubility of TTCP and β-TCP by solid titration
Authors
Keywordsβ-TCP
Solid titration
Solubility
TTCP
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/archoralbio
Citation
Archives Of Oral Biology, 2009, v. 54 n. 7, p. 671-677 How to Cite?
Abstract
Objective: Using solid titration with hydroxyapatite (HAp) and octacalcium phosphate, HAp has been found to be more stable than dicalcium phosphate dihydrate (DCPD) even at lower pH, inconsistent with the widely reported view that DCPD is less soluble than other calcium phosphates below pH 4.2. A check of the behaviour of other calcium phosphates (TTCP; Ca/P: 2.00 and β-TCP; Ca/P: 1.33) is necessary. Methods: Solid titration was used to determine the effective solubility of TTCP and β-TCP in 100 mM KCl solution at 37.0 ± 0.1 °C for pH ∼2.9-9.2 and ∼3-7.4 respectively. The constitution of the precipitate was determined by XRD, particle morphology was observed by SEM and TEM, and the precipitate Ca/P ratio was calculated by EDX. Results: The only identified solid phase at equilibrium was HAp at both pH 3.60 and 4.50; no residual titrant or other phases were detected. A marked change of slope in the curve occurred at pH ∼3.9 for TTCP. Conclusion: HAp was verified to be more stable than other calcium phosphates, especially at lower pH. That DCPD is more stable below pH 4.2 is contradicted. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/143140
ISSN
2013 Impact Factor: 1.880
2013 SCImago Journal Rankings: 0.677
ISI Accession Number ID
Funding AgencyGrant Number
University of Hong Kong
Funding Information:

This work was done in partial-fulfilment of the requirements for the degree of Ph.D. for Haobo Pan at and supported by the Faculty of Dentistry, The University of Hong Kong. The authors thank P.K.D. Lee and T.D.B. Yuen for technical support; F. Chan for TEM observation; and G-F. Chen for XRD analysis.

References

 

Author Affiliations
  1. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorPan, HBen_HK
dc.contributor.authorDarvell, BWen_HK
dc.date.accessioned2011-11-02T03:06:20Z-
dc.date.available2011-11-02T03:06:20Z-
dc.date.issued2009en_HK
dc.identifier.citationArchives Of Oral Biology, 2009, v. 54 n. 7, p. 671-677en_HK
dc.identifier.issn0003-9969en_HK
dc.identifier.urihttp://hdl.handle.net/10722/143140-
dc.description.abstractObjective: Using solid titration with hydroxyapatite (HAp) and octacalcium phosphate, HAp has been found to be more stable than dicalcium phosphate dihydrate (DCPD) even at lower pH, inconsistent with the widely reported view that DCPD is less soluble than other calcium phosphates below pH 4.2. A check of the behaviour of other calcium phosphates (TTCP; Ca/P: 2.00 and β-TCP; Ca/P: 1.33) is necessary. Methods: Solid titration was used to determine the effective solubility of TTCP and β-TCP in 100 mM KCl solution at 37.0 ± 0.1 °C for pH ∼2.9-9.2 and ∼3-7.4 respectively. The constitution of the precipitate was determined by XRD, particle morphology was observed by SEM and TEM, and the precipitate Ca/P ratio was calculated by EDX. Results: The only identified solid phase at equilibrium was HAp at both pH 3.60 and 4.50; no residual titrant or other phases were detected. A marked change of slope in the curve occurred at pH ∼3.9 for TTCP. Conclusion: HAp was verified to be more stable than other calcium phosphates, especially at lower pH. That DCPD is more stable below pH 4.2 is contradicted. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/archoralbioen_HK
dc.relation.ispartofArchives of Oral Biologyen_HK
dc.subjectβ-TCPen_HK
dc.subjectSolid titrationen_HK
dc.subjectSolubilityen_HK
dc.subjectTTCPen_HK
dc.titleSolubility of TTCP and β-TCP by solid titrationen_HK
dc.typeArticleen_HK
dc.identifier.emailPan, HB: haobo@hku.hken_HK
dc.identifier.emailDarvell, BW: b.w.darvell@hku.hken_HK
dc.identifier.authorityPan, HB=rp01564en_HK
dc.identifier.authorityDarvell, BW=rp00007en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.archoralbio.2008.01.001en_HK
dc.identifier.pmid19414172en_HK
dc.identifier.scopuseid_2-s2.0-67349254691en_HK
dc.identifier.hkuros163521-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-67349254691&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume54en_HK
dc.identifier.issue7en_HK
dc.identifier.spage671en_HK
dc.identifier.epage677en_HK
dc.identifier.isiWOS:000267480800009-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridPan, HB=7403295092en_HK
dc.identifier.scopusauthoridDarvell, BW=7005953926en_HK
dc.identifier.citeulike5347238-

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