Document Detail


Inhibition of hydroxyapatite dissolution by ovalbumin as a function of pH, calcium concentration, protein concentration and acid type.
MedLine Citation:
PMID:  18714157     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Hydroxyapatite is the main constituent of the dental hard tissues, and in vivo its dissolution in acids leads to the pathological condition of dental erosion. Food proteins which inhibit hydroxyapatite dissolution may find application as erosion-reducing agents in food and drink products. The aim of this study was to investigate the egg protein ovalbumin as a potential inhibitor of hydroxyapatite dissolution in acidic solutions, with conditions representative of dental erosion. The dissolution rate of hydroxyapatite discs was measured in an acidic solution as a function of pH, calcium concentration, ovalbumin concentration and acid type. All experiments were performed in triplicate. 0.2% w/v ovalbumin significantly reduced the dissolution rate in citric acid by 50-75% over the pH range 2.80-4.00, and by 45-60% in solutions with calcium concentrations of up to 20 mM (p < 0.05). The effect was persistent for several rinses after the initial exposure to the protein. 0.02% w/v ovalbumin significantly reduced the dissolution of hydroxyapatite in citric acid by 30-55%. Ovalbumin did not, however, statistically significantly reduce the hydroxyapatite dissolution rate in malic or lactic acids. The effect is ascribed to adsorption and partial, reversible denaturation of ovalbumin on the hydroxyapatite surface. There may be some interaction between ovalbumin and the citrate ion which promotes the adsorption of protein in the presence of citric acid. Ovalbumin shows promise as a potential erosion-reducing additive to citrus-based drinks.
Authors:
C A Hemingway; R P Shellis; D M Parker; M Addy; M E Barbour
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-08-19
Journal Detail:
Title:  Caries research     Volume:  42     ISSN:  1421-976X     ISO Abbreviation:  Caries Res.     Publication Date:  2008  
Date Detail:
Created Date:  2008-09-30     Completed Date:  2009-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0103374     Medline TA:  Caries Res     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  348-53     Citation Subset:  D; IM    
Copyright Information:
Copyright 2008 S. Karger AG, Basel.
Affiliation:
Department of Oral and Dental Science, University of Bristol, Bristol, UK.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Calcium / chemistry*
Citric Acid / chemistry
Durapatite / chemistry*
Humans
Hydrogen-Ion Concentration
Lactic Acid / chemistry
Malates / chemistry
Materials Testing
Ovalbumin / chemistry*
Protein Denaturation
Solubility
Surface Properties
Chemical
Reg. No./Substance:
0/Malates; 1306-06-5/Durapatite; 50-21-5/Lactic Acid; 6915-15-7/malic acid; 7440-70-2/Calcium; 77-92-9/Citric Acid; 9006-59-1/Ovalbumin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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