The development of advanced biomaterials is crucial for addressing the increasing demand for improved medical implants and tissue engineering scaffolds. Hydroxyapatite (HAp), a naturally occurring mineral form of calcium apatite, is widely recognized for its excellent biocompatibility and osteoconductivity, making it an ideal candidate for bone-related applications. However, its brittleness and lack of flexibility limit its broader application in dynamic biological environments. To overcome these limitations, this study explores the synthesis of Hydroxyapatite/Alginate (HAp/Alg) nanocomposites, leveraging the biocompatibility and flexibility of alginate—a natural polysaccharide derived from brown seaweed. The HAp/Alg nanocomposites were synthesized using in situ hybridization techniques with varying alginate concentrations (10 to 40 wt%) to optimize their structural and functional properties. The motivation behind this work lies in the potential of these composites to combine the desirable properties of both HAp and alginate, resulting in a material that not only mimics the mineral composition of bone but also offers enhanced flexibility and structural integrity. A comprehensive analysis was conducted using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA), Scanning Electron Microscopy (SEM), and cytotoxicity testing to evaluate the structural, chemical, and biological properties of the composites. XRD analysis indicated a complex interaction between alginate concentration and crystal growth, with crystallite size increasing up to 10 wt% alginate before decreasing. FT-IR spectra confirmed significant biological reactivity at the composite’s surface and within the polymer matrix, suggesting strong potential for biological interactions. SEM images revealed a more uniform microstructure in HAp/Alg composites compared to pure HAp, which is likely to improve their performance in biomedical applications. TGA/DTA results demonstrated the thermal stability of the composites across various temperature conditions, while cytotoxicity tests confirmed their biocompatibility, making them suitable for use in medical applications. This study not only successfully synthesizes HAp/Alg nanocomposites with enhanced structural uniformity and biocompatibility but also provides a promising avenue for the development of next-generation biomaterials that could significantly impact the field of regenerative medicine and biomedical engineering.
KeywordsHAPTG/DTAXRD
Brydone, A.S., Meek, D. and Maclaine, S. (2010) Bone Grafting, Orthopaedic Biomaterials, and the Clinical Need for Bone Engineering. Proceedings of the Institution of Mechanical Engineers , Part H : Journal of Engineering in Medicine , 224, 1329-1343. https://doi.org/10.1243/09544119jeim770
James, R., Deng, M., Laurencin, C.T. and Kumbar, S.G. (2011) Nanocomposites and Bone Regeneration. Frontiers of Materials Science , 5, 342-357. https://doi.org/10.1007/s11706-011-0151-3
Duan, B., Wang, M., Zhou, W.Y., Cheung, W.L., Li, Z.Y. and Lu, W.W. (2010) Three-dimensional Nanocomposite Scaffolds Fabricated via Selective Laser Sintering for Bone Tissue Engineering. Acta Biomaterialia , 6, 4495-4505. https://doi.org/10.1016/j.actbio.2010.06.024
Goulet, J.A., Senunas, L.E., DeSilva, G.L. and Greenfield, M.L.V.H. (1997) Autogenous Iliac Crest Bone Graft: Complications and Functional Assessment. Clinical Orthopaedics and Related Research , 339, 76-81. https://doi.org/10.1097/00003086-199706000-00011
Wagoner Johnson, A.J. and Herschler, B.A. (2011) A Review of the Mechanical Behavior of Cap and Cap/Polymer Composites for Applications in Bone Replacement and Repair. Acta Biomaterialia , 7, 16-30. https://doi.org/10.1016/j.actbio.2010.07.012
Scholz, M., Blanchfield, J.P., Bloom, L.D., Coburn, B.H., Elkington, M., Fuller, J.D., et al . (2011) The Use of Composite Materials in Modern Orthopaedic Medicine and Prosthetic Devices: A Review. Composites Science and Technology , 71, 1791-1803. https://doi.org/10.1016/j.compscitech.2011.08.017
Yu, N.Y.C., Schindeler, A., Little, D.G. and Ruys, A.J. (2010) Biodegradable Poly( α -Hydroxy Acid) Polymer Scaffolds for Bone Tissue Engineering. Journal of Biomedical Materials Research Part B : Applied Biomaterials , 93, 285-295. https://doi.org/10.1002/jbm.b.31588
Sahoo, N.G., Pan, Y.Z., Li, L. and He, C.B. (2013) Nanocomposites for Bone Tissue Regeneration. Nanomedicine , 8, 639-653. https://doi.org/10.2217/nnm.13.44
Roeder, R.K., Converse, G.L., Kane, R.J. and Yue, W. (2008) Hydroxyapatite-Reinforced Polymer Biocomposites for Synthetic Bone Substitutes. JOM , 60, 38-45. https://doi.org/10.1007/s11837-008-0030-2
Bobyn, J.D., Mortimer, E.S., Glassman, A.H., Engh, C.A., Miller, J.E. and Brooks, C.E. (1992) Producing and Avoiding Stress Shielding. Clinical Orthopaedics and Related Research , 274, 79-96. https://doi.org/10.1097/00003086-199201000-00010
Rose, F.R.A.J. and Oreffo, R.O.C. (2002) Bone Tissue Engineering: Hope vs Hype. Biochemical and Biophysical Research Communications , 292, 1-7. https://doi.org/10.1006/bbrc.2002.6519
Swetha, M., Sahithi, K., Moorthi, A., Srinivasan, N., Ramasamy, K. and Selvamurugan, N. (2010) Biocomposites Containing Natural Polymers and Hydroxyapatite for Bone Tissue Engineering. International Journal of Biological Macromolecules , 47, 1-4. https://doi.org/10.1016/j.ijbiomac.2010.03.015
Barone, D.T., Raquez, J. and Dubois, P. (2011) Bone-Guided Regeneration: From Inert Biomaterials to Bioactive Polymer (Nano)composites. Polymers for Advanced Technologies , 22, 463-475. https://doi.org/10.1002/pat.1845
Sun, F., Zhou, H. and Lee, J. (2011) Various Preparation Methods of Highly Porous Hydroxyapatite/Polymer Nanoscale Biocomposites for Bone Regeneration. Acta Biomaterialia , 7, 3813-3828. https://doi.org/10.1016/j.actbio.2011.07.002
Rogel, M.R., Qiu, H. and Ameer, G.A. (2008) The Role of Nanocomposites in Bone Regeneration. Journal of Materials Chemistry , 18, 4233-4241. https://doi.org/10.1039/b804692a
Rajkumar, M., Meenakshisundaram, N. and Rajendran, V. (2011) Development of Nanocomposites Based on Hydroxyapatite/Sodium Alginate: Synthesis and Characterisation. Materials Characterization , 62, 469-479. https://doi.org/10.1016/j.matchar.2011.02.008
Noor, Z. (2013) Nanohydroxyapatite Application to Osteoporosis Management. Journal of Osteoporosis , 2013, Article ID: 679025. https://doi.org/10.1155/2013/679025
Wang, L., Li, Y. and Li, C. (2008) In Situ Processing and Properties of Nanostructured Hydroxyapatite/Alginate Composite. Journal of Nanoparticle Research , 11, 691-699. https://doi.org/10.1007/s11051-008-9431-y
Murugan, R. and Ramakrishna, S. (2004) Bioresorbable Composite Bone Paste Using Polysaccharide Based Nano Hydroxyapatite. Biomaterials , 25, 3829-3835. https://doi.org/10.1016/j.biomaterials.2003.10.016
Yamaguchi, I., Tokuchi, K., Fukuzaki, H., Koyama, Y., Takakuda, K., Monma, H., et al . (2001) Preparation and Microstructure Analysis of Chitosan/Hydroxyapatite Nanocomposites. Journal of Biomedical Materials Research , 55, 20-27. https://doi.org/10.1002/1097-4636(200104)55:1<20::aid-jbm30>3.3.co;2-6
Lin, H. and Yeh, Y. (2004) Porous Alginate/Hydroxyapatite Composite Scaffolds for Bone Tissue Engineering: Preparation, Characterization, and in Vitro Studies. Journal of Biomedical Materials Research Part B : Applied Biomaterials , 71, 52-65. https://doi.org/10.1002/jbm.b.30065
Maruyama, M., Terayama, K., Ito, M., Takei, T. and Kitagawa, E. (1995) Hydroxyapatite Clay for Gap Filling and Adequate Bone Ingrowth. Journal of Biomedical Materials Research , 29, 329-336. https://doi.org/10.1002/jbm.820290308
Ribeiro, C.C., Barrias, C.C. and Barbosa, M.A. (2004) Calcium Phosphate-Alginate Microspheres as Enzyme Delivery Matrices. Biomaterials , 25, 4363-4373. https://doi.org/10.1016/j.biomaterials.2003.11.028
Sivakumar, M. and Rao, K.P. (2003) Preparation, Characterization, and in Vitro Release of Gentamicin from Coralline Hydroxyapatite-Alginate Composite Microspheres. Journal of Biomedical Materials Research Part A , 65, 222-228. https://doi.org/10.1002/jbm.a.10495
Teng, S., Shi, J., Peng, B. and Chen, L. (2006) The Effect of Alginate Addition on the Structure and Morphology of Hydroxyapatite/Gelatin Nanocomposites. Composites Science and Technology , 66, 1532-1538. https://doi.org/10.1016/j.compscitech.2005.11.021
Qiu, M.D., Yan, W.X., Li, X., Mei, L.H. and Yao, Z.H. (2013) Preparation and Microanalysis of Hydroxyapatite/Chitosan-Sodium Alginate Composite Materials. Materials Review , 27, 60-62.
Tolba, E., et al . (2010) Biomimetic Synthesis of Guided-Tissue Regeneration Hydroxyapatite/Polyvinl Alcohol Nanocomposite Scaffolds: Influence of Alignate on Mechanical and Biological Properties. Journal of American Science , 6, 239-249.
Daemi, H. and Barikani, M. (2012) Synthesis and Characterization of Calcium Alginate Nanoparticles, Sodium Homopolymannuronate Salt and Its Calcium Nanoparticles. Scientia Iranica , 19, 2023-2028. https://doi.org/10.1016/j.scient.2012.10.005
Berzina-Cimdina, L. and Borodajenko, N. (2012) Research of Calcium Phosphates Using Fourier Transform Infrared Spectroscopy. In: Theophanides, T., Ed., Infrared Spectroscopy — Materials Science , Engineering and Technology , InTech, 125-141. https://doi.org/10.5772/36942
Liao, C., Lin, F., Chen, K. and Sun, J. (1999) Thermal Decomposition and Reconstitution of Hydroxyapatite in Air Atmosphere. Biomaterials , 20, 1807-1813. https://doi.org/10.1016/s0142-9612(99)00076-9
Venkatasubbu, G.D., Ramasamy, S., Ramakrishnan, V. and Kumar, J. (2011) Hydroxyapatite-Alginate Nanocomposite as Drug Delivery Matrix for Sustained Release of Ciprofloxacin. Journal of Biomedical Nanotechnology , 7, 759-767. https://doi.org/10.1166/jbn.2011.1350