NDLI: Antibacterial effect and cytotoxicity of Ag-doped functionally graded hydroxyapatite coatings.

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Antibacterial effect and cytotoxicity of Ag-doped functionally graded hydroxyapatite coatings.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bai, Xiao Sandukas, Stefan Appleford, Mark Ong, Joo L. Rabiei, Afsaneh
Description	Author Affiliation: Bai X ( Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695.)
Abstract	Functionally graded hydroxyapatite coatings (FGHA) doped with 1, 3, and 6.5 wt % silver (Ag) have been deposited on Titanium using ion-beam-assisted deposition. Scanning transmission electron microscopy on coating cross sections confirmed the presence of FGHA coating with mostly amorphous layers at the top and mostly crystalline layers toward the coating interface as well as the existence of 10-50 nm Ag particles distributed throughout the thickness of the coatings. Calcium release in phosphate buffered saline solution showed a high release rate of Ca at the beginning of the test, and a gradual decrease in release rate thereafter to a minimum level until day 7. Similarly, the release rate of Ag in ultra pure water was initially high in the first 4 h and then gradually decreased over a 7 days period. Antibacterial tests have shown a reduction in the viability of S. aureus in Ag-doped coatings particularly in samples with higher Ag concentrations of 3 and 6.5 wt %. Cytotoxicity tests using an osteoblast cell line, on the other hand, have demonstrated that the samples with 6.5 wt % Ag have a negative effect on osteoblast cell response, proliferation, and apoptosis as well as a negative effect on protein and osteocalcin production. It is notable that the samples with 3 wt % Ag or less presented minimal cytotoxicity compared with control surfaces. Considering both the antibacterial and cytotoxicity effects, it is suggested that the 3 wt % of Ag in FGHA coatings can be favorable.
File Format	HTM / HTML
ISSN	15524973
Issue Number	2
Volume Number	100
e-ISSN	15524981
Journal	Journal of Biomedical Materials Research Part B: Applied Biomaterials
Language	English
Publisher	Wiley
Publisher Date	2012-02-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biomedical engineering Anti-bacterial Agents Coated Materials, Biocompatible Durapatite Silver Staphylococcus Aureus Growth & Development Titanium Chemistry Pharmacology Cell Line Humans Materials Testing Osteoblasts Cytology Metabolism Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biomedical Engineering

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