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Antibacterial nanosized silver substituted hydroxyapatite: Synthesis and characterization

Rameshbabu, N. and Kumar, T. S. Sampath and Prabhakar, T. G. and Sastry, V. S. and Murty, K. V. G. K. and Rao, K. Prasad (2007) Antibacterial nanosized silver substituted hydroxyapatite: Synthesis and characterization. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A, 80A (3). pp. 581-591.


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The silver (0.5-3 at %) substituted nanosize hydroxyapatites (AgHAs) were synthesized by microwave processing. The X-ray diffraction (XRD) peaks are very broad, indicating that the AgHAs were of nanosize (30 nm). Transmission electron microscopy analysis shows needlelike morphology of AgHA, having length 60-70 nm and width 15-20 nm. The AgHA phase was stable up to 700 degrees C without any secondary phases. The antibacterial effect of AgHA against Escherichia coli and Stapliylococciis aureus was observed by spread plate method, even for low concentration of silver ions (03%) with 1 x 10(5) cells/ mL of respective bacterial culture, after a 48 h incubation period. However, some colonies of E. coli were seen with a high dose of 1 x 10(8) cells/mL after 24 h. The zone of inhibition by disc diffusion test method was found to vary with the amount of silver in the sintered AgHA pellets, for both the bacteria, after 24 h of inoculation. Osteoblast cell attachment in varying density was noticed on AgHA samples with 0.5, 1.0, and 1.5%, silver substitution. However, osteoblast spreading was significantly greater on 05% AgHA compared to 1.0 or 1.5% substituted AgHA samples. Thus, the low amount of AgHA has a potential of minimizing the risk of bacterial contamination, without compromising the bioactivity, and is expected to display greater biological efficacy in terms of osseointegration. (c) 2006 Wiley Periodicals, Inc.

Item Type:Article
Uncontrolled Keywords:hydroxyapatite; nanoparticle; microwave processing; antibacterial; osteoblast
Subjects:Biomedical Science > Nanobiotechnology
Biomedical Science > Nanotechnology for human health
Material Science > Nanostructured materials
ID Code:860
Deposited On:05 Dec 2008 14:47
Last Modified:25 Feb 2009 13:38

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