Abstract
Bioactive glasses have been popular as coating materials on bone implants in recent years to increase their integration with the host tissue and overall biological function. Infection and toxicity are significant factors in the failure of bone-implant material. The goal of this research is to develop a sol-gel derived, Al2O3 doped nanobioactive glass-ceramics (nBGC) with non-toxic and antibacterial activity. The main crystalline phase of sodium calcium silicate was transformed to sodium calcium aluminium silicate by increasing the Al2O3 concentration, it was confirmed by X-ray diffraction (XRD) and Fourier Transform Infra-Red (FTIR) spectroscopy analysis. The density and mechanical strength were increased as 2.63–3.12 g/cm3 and 75–105 MPa, respectively for the sample x = 0 to 10 wt.%. The formation of hydroxyapatite (HAp) was proved by XRD, FTIR, and FESEM (Field Emission Scanning Electron Microscope) with EDS (Energy Dispersive X-ray Spectroscopy) analysis through variations in pH, zeta potential, and degradation behavior. Higher cell viability percentage was attained as >99% for L929 cells, outstanding antibacterial activity against E. coli and S. aureus and excellent hydrophilic nature were obtained for the sample nBGC-10Al. Altogether, a higher concentration of Al2O3 in nBGC could enhance the physical and biological properties and it can be used as an excellent candidate for orthopedic applications.
Highlights
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Addition of Al2O3 into (50-x)%SiO2-26%Na2O-16%CaO-4%P2O5-4%MgO-xAl2O3 nanobioactive glass ceramics (nBGC-xAl) by sol–gel method (x = 0, 2, 4, 6, 8 and 10 wt.%] to enhance the physical and biological properties.
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nBGC-xAl (x = 8 and 10 wt.%) has maximum compressive strength of 105 MPa which is close to the compressive strength of human cortical bone.
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The sample of nBGC-10Al shows no cytotoxicity behaviour and good biocompatible with L929 fibroblast cells.
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nBGC-10Al has excellent antibacterial activity on gram-negative (E. coli) and gram-positive (S. aureus) bacteria.
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Acknowledgements
The authors are thankful to DST-FIST sponsored XRD laboratory in the Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu and gratefully acknowledge our sincere thanks to the Department of Biotechnology, Manonmaniam Sundaranar University, Tirunelveli for providing lab facilities of bioactivity test and antibacterial study. And our hearty thanks to CeNSE, IISc, Bangalore for FESEM & EDS and Micro UTM analysis. I am grateful to The South India Textile Research Association (SITRA), Coimbatore for the cytocompatibility study. Special thanks to OriginPro, Version 2021b. OriginLab Corporation, Northampton, MA, USA. Our sincere thanks to Central Leather Research Institute (CLRI) for Contact Angle Measurement.
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We declare that the authorship of all authors has been confirmed and each author made a significant contribution to the article. K.M.M.S.: conceptualization, methodology, validation, formal analysis, writing - original draft, visualization; S.S.: conceptualization, investigation, visualization; R.S.: software, validation, formal analysis, writing - review & editing; M.I.: formal analysis, validation.
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Kairon Mubina, M.S., Shailajha, S., Sankaranarayanan, R. et al. Bone formation with high bacterial inhibition and low toxicity behavior by melding of Al2O3 on nanobioactive glass ceramics via sol-gel process. J Sol-Gel Sci Technol 103, 151–171 (2022). https://doi.org/10.1007/s10971-022-05842-9
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DOI: https://doi.org/10.1007/s10971-022-05842-9