title: Biogenic silica-metal phosphate (metal = Ca, Fe or Zn) nanocomposites: fabrication from rice husk and their biomedical applications.
abstract: In this investigation, we fabricated biogenic silica-metal phosphate nanocomposites (BSMPNs) using rice husk from agricultural waste as a silica source. The morphologies and dimensions of the synthesized nanocomposites were analyzed using transmission electron microscopy (TEM). Fourier-transform infrared spectroscopy results confirmed that metal phosphate crystals were formed with the biogenic silica. The X-ray diffraction patterns of the BSMPNs showed the presence of hexagonal calcium and iron phosphate and orthorhombic zinc phosphate nanoparticles embedded in the matrix of biogenic silica. The TEM images suggested that spherical and irregularly shaped tiny particles with dimensions between 50 and 100 nm were dispersed in the biogenic silica. The in vitro biological properties of the nanocomposites were studied by a cell viability assay and through the analysis of microscopy images. The cytocompatibility studies proved that the material was nontoxic and had excellent biocompatibility with human mesenchymal stem cells. The synthetic route for these nanocomposites is interesting and may be helpful in the fabrication of various novel silica-based composites and in the exploitation of eco-friendly agricultural biomass. Our results revealed that these nanocomposites can be used in bone tissue engineering.
authors.affiliation: Department of Food Science and Nutrition, Nanobiotechnology and Molecular Biology Research Lab, College of Food Sciences and Agriculture, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia.
authors.forename: Jegan
authors.initials: J
authors.lastname: Athinarayanan
authors.forename: Vaiyapuri Subbarayan
authors.initials: VS
authors.lastname: Periasamy
authors.forename: Ali A
authors.initials: AA
authors.lastname: Alshatwi
mesh_terms: D001842:Bone and Bones / Q000473:pathology; D002118:Calcium / Q000737:chemistry*; D003460:Crystallization; D006801:Humans; D007501:Iron / Q000737:chemistry*; D059630:Mesenchymal Stem Cells / Q000166:cytology; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D012275:Oryza; D010100:Oxygen / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013778:Tetrazolium Salts / Q000737:chemistry; D013844:Thiazoles / Q000737:chemistry; D023822:Tissue Engineering / Q000379:methods; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D010710:Phosphates; D013778:Tetrazolium Salts; D013844:Thiazoles; D012822:Silicon Dioxide; D007501:Iron; C022616:thiazolyl blue; D015032:Zinc; D010100:Oxygen; D002118:Calcium
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