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Alginate templated synthesis, characterization and in vitro osteogenic evaluation of strontium-substituted hydroxyapatite.

Authors
  • Akshata, C R1
  • Murugan, E2
  • Harichandran, G3
  • 1 Department of Polymer Science, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India. Electronic address: [email protected]. , (India)
  • 2 Department of Physical Chemistry, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India. , (India)
  • 3 Department of Polymer Science, University of Madras, Guindy Campus, Chennai 600025, Tamil Nadu, India. Electronic address: [email protected]. , (India)
Type
Published Article
Journal
International journal of biological macromolecules
Publication Date
Dec 01, 2023
Volume
252
Pages
126478–126478
Identifiers
DOI: 10.1016/j.ijbiomac.2023.126478
PMID: 37625758
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The objective of this study is to explore the potential role of alginate (Alg) in the crystallization of metal-substituted hydroxyapatite, with application in orthopaedic reconstruction. The alginate at different concentrations (0.5 and 1.0 wt%) facilitated in situ mineralization of hydroxyapatite (HA) and strontium-substituted HA (SHA, 10 and 30 mol%). The incorporation of the biopolymer and dopant induced notable changes in HA, including reduced crystal size from 31.0 to 16.4 nm and increased lattice volume from 577.3 to 598.0 Å3. The superior affinity of alginate for Sr2+ than for Ca2+ resulted in higher residual alginate in Alg/SHA (13.0 to 19.0 %) compared to Alg/HA (7.1 to 8.2 %). This residual alginate influenced composite properties: surface charge decreased from -26.5 to -45.7 mV, microhardness increased from 0.33 to 0.54 GPa, and dissolution increased from 0.17 to 0.39 %. The in vitro studies revealed that strontium substitution as well as the organization and crystallographic aspects of apatite regulated osteoblastic cell survival, proliferation, differentiation, and biomineralization. The findings suggest that an alginate concentration of 0.5 wt% is optimal for the crystallization of SHA with 10 mol% substitution, and its resulting composite possesses the ideal biomechanical properties to imitate native bone. Copyright © 2023 Elsevier B.V. All rights reserved.

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