Bioactivity and antibacterial behaviors of nanostructured lithium-doped hydroxyapatite for bone scaffold application

Keikhosravani, Pardis and Maleki-Ghaleh, Hossein and Khosrowshahi, Amir Kahaie and Bodaghi, Mahdi and Dargahi, Ziba and Kavanlouei, Majid and Khademi-Azandehi, Pooriya and Fallah, Ali and Beygi-Khosrowshahi, Younes and Siadati, M. Hossein (2021) Bioactivity and antibacterial behaviors of nanostructured lithium-doped hydroxyapatite for bone scaffold application. International Journal of Molecular Sciences, 22 (17). ISSN 1661-6596 (Print) 1422-0067 (Online)

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The material for bone scaffold replacement should be biocompatible and antibacterial to prevent scaffold-associated infection. We biofunctionalized the hydroxyapatite (HA) properties by doping it with lithium (Li). The HA and 4 Li-doped HA (0.5, 1.0, 2.0, 4.0 wt.%) samples were investigated to find the most suitable Li content for both aspects. The synthesized nanoparticles, by the mechanical alloying method, were cold-pressed uniaxially and then sintered for 2 h at 1250◦C. Characterization using field-emission scanning electron microscopy (FE-SEM) revealed particle sizes in the range of 60 to 120 nm. The XRD analysis proved the formation of HA and Li-doped HA nanoparticles with crystal sizes ranging from 59 to 89 nm. The bioactivity of samples was investigated in simulated body fluid (SBF), and the growth of apatite formed on surfaces was evaluated using SEM and EDS. Cellular behavior was estimated by MG63 osteoblast-like cells. The results of apatite growth and cell analysis showed that 1.0 wt.% Li doping was optimal to maximize the bioactivity of HA. Antibacterial characteristics against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were performed by colony-forming unit (CFU) tests. The results showed that Li in the structure of HA increases its antibacterial properties. HA biofunctionalized by Li doping can be considered a suitable option for the fabrication of bone scaffolds due to its antibacterial and unique bioactivity properties.
Item Type: Article
Uncontrolled Keywords: Antibacterial; Bioactivity; Hydroxyapatite; Li doping; Mechanical alloying
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Ali Fallah
Date Deposited: 29 Aug 2022 16:30
Last Modified: 29 Aug 2022 16:30

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