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Title: Fabrication of nano-hydroxyapatite/collagen/osteonectin composites for bone graft applications
Authors: Liao, S. 
Ngiam, M.
Chan, C.K. 
Ramakrishna, S. 
Issue Date: 2009
Citation: Liao, S., Ngiam, M., Chan, C.K., Ramakrishna, S. (2009). Fabrication of nano-hydroxyapatite/collagen/osteonectin composites for bone graft applications. Biomedical Materials 4 (2) : -. ScholarBank@NUS Repository.
Abstract: Mineralized type I collagen (collagen I) nanofibers and their nanofibril bundles make up the microstructure of natural bone tissue, which range from nanometers to micrometers. However, attempts to achieve this hierarchically assembled structure in vitro have been unsuccessful. In this study, we added osteonectin into the collagen I solution, either at a high or low weight ratio (osteonectin: collagen I = 1:30 or 1:90) before co-precipitation. Results indicated that spindle-like nano-hydroxyapatite (nano-HA) was deposited on collagen/osteonectin and pure osteonectin (control) groups. Furthermore, transmission electron microscope (TEM) and scanning electron microscope (SEM) results showed that the assembled mineralized fiber bundles were formed randomly at different levels from 50 nm, 250 nm to 1100 nm. However, when we replaced collagen I with collagen II, osteonectin addition did not induce the formation of mineralized fiber bundles. The participation of osteonectin in the assembly of the mineralized fibers could provide new insights into the novel mineralization function of osteonectin for bone development in vivo and advancing new biomimetic methods for bone graft applications. © 2009 IOP Publishing Ltd.
Source Title: Biomedical Materials
ISSN: 17486041
DOI: 10.1088/1748-6041/4/2/025019
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