Multi-element substituted hydroxyapatites: synthesis, structural characteristics and evaluation of their bioactivity, cell viability, and antibacterial activity
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Synthesis of unsubstituted and multi-element (magnesium, zinc and cobalt) substituted hydroxyapatites (HAP) with varying stoichiometric compositions and evaluation of their morphological and structural characteristics, degree of crystallinity, bioactivity, cytotoxicity and antibacterial activity are addressed. The morphological features are not altered much following the substitution of Mg2+, Zn2+, and Co2+ in the HAP lattice. Nevertheless, their substitution exerts a strong influence on the structural characteristics HAP. Rietveld refinement analysis of the X-ray diffraction patterns indicates a decrease in crystallinity and mineralogical composition of HAP phase, which is accompanied with an increase of β-tricalcium phosphate (β-TCP) phase along with Co3O4 phase. Broadening of the PO43− peaks and a decrease in intensity of the OH− peak are observed by Fourier-transform infrared spectra. A decrease in intensity, broadening and a slight shift in Raman band (at 961 cm−1 for HAP) towards the lower side suggest the incorporation of Mg, Zn, and Co, disordering of the crystal structure of HAP and formation of β-TCP as additional phase besides HAP. The MgZnCo-HAP’s exhibits a better bioactivity, cell viability and anti-bacterial activity than the unsubstituted HAP. However, a decrease in cell viability and anti-bacterial activity are observed when the stoichiometric ratio of the substituent elements is relatively higher.
KeywordsHydroxyapatite β-tricalcium phosphate Multi-element substitution Bioactivity Antibacterial activity Cytotoxicity
The authors thank the Director, National Centre for Nanoscience and Nanotechnology (NCNSNT) for extending characterization facilities such as SEM and EDS, Department of Nuclear Physics, University of Madras for providing X-ray diffraction facilities and Dr. C. Arulvasu, Department of Zoology, University of Madras for his kind help and valuable suggestions in performing cell growth studies. The authors also thank Dr. S. Kannan, Assistant professor, Centre for Nanoscience and Technology, Pondicherry University, Puducherry, for his guidance and help in performing the Rietveld refinement analysis.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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