title: Synthesis of phosphorylated chitosan by novel method and its characterization.
abstract: Chitosan a natural based polymer is non-toxic, biocompatible and biodegradable. Chemical modification of chitosan to generate new bifunctional materials and finally would bring new properties depending on the nature of the group introduced. In our present study, we prepared phosphorylated chitosan (P-chitosan) by using H(3)PO(4)/P(2)O(5)/Et(3)PO(4)/hexanol method. From our present method, we got high yield and high degree of substitution (DS). The prepared P-chitosan (DS-1.18) was characterized by FT IR, (13)C NMR, (31)P NMR, elemental, XRD, TGA, DTA and SEM studies. After the phosphorylation, the solubility of the polymer was improved. The P-chitosan showed less thermal stability and crystallinity than the chitosan. It was due to the phosphorylation.
authors.affiliation: Faculty of Chemistry, Materials and Bioengineering and HRC, Kansai University, Osaka 564-8680, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Jayakumar
authors.forename: H
authors.initials: H
authors.lastname: Nagahama
authors.forename: T
authors.initials: T
authors.lastname: Furuike
authors.forename: H
authors.initials: H
authors.lastname: Tamura
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D048271:Chitosan / Q000138:chemical synthesis* / Q000737:chemistry*; D000441:Hexanols / Q000737:chemistry; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D010766:Phosphorylation; D011108:Polymers / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D001672:Biocompatible Materials; D000441:Hexanols; D011108:Polymers; D048271:Chitosan