title: Synthesis of the ketimine of chitosan and 4,6-diacetylresorcinol, and study of the catalase-like activity of its copper chelate.
abstract: In this study, a new chitosan derivative (ketimine) was synthesized by condensation of chitosan with 4,6-diacetylresorcinol (DAR) at heterogeneous medium. The ketimine derivative of chitosan (DAR-chitosan) was characterized by elemental (C, H, N), spectral (DR-UV-vis and FT-IR spectroscopy), structural (powder XRD), and morphological (SEM) analyses. The degree of substitution (DS) of DAR-chitosan was evaluated by elemental analysis and (13)C CP-MAS NMR spectroscopy and found to be around 12%. The copper (II) metal complex of DAR-chitosan was prepared and characterized by FT-IR, DR-UV-vis and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Thermal behaviors of the synthesized compounds were investigated by DSC and TG-DTG-DTA analysis. The catalytic activity of copper (II) complex of chitosan derivative (DAR-chitosan-Cu) was investigated on hydrogen peroxide decomposition. The copper chelate showed high efficiency (over 80%) towards the decomposition of hydrogen peroxide as heterogeneous catalyst.
authors.affiliation: Department of Chemistry, Faculty of Science and Letters, Mustafa Kemal University, 31040 Hatay, Turkey.
authors.forename: Cahit
authors.initials: C
authors.lastname: Demetgül
mesh_terms: D002374:Catalase / Q000737:chemistry; D002384:Catalysis; D048271:Chitosan / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007097:Imines / Q000138:chemical synthesis / Q000737:chemistry*; D009570:Nitriles / Q000138:chemical synthesis / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry*
chemical_list: C526645:4,6-diacetylresorcinol; D056831:Coordination Complexes; D007097:Imines; D009570:Nitriles; D012118:Resorcinols; C542835:ketimine; D003300:Copper; D048271:Chitosan; D006861:Hydrogen Peroxide; D002374:Catalase