title: Oxidative degradation of chitosan to the low molecular water-soluble chitosan over peroxotungstate as chemical scissors.
abstract: Low molecular water-soluble chitosan was prepared by the depolymerization of chitosan in the presence of a series of catalysts with active W(O2) sites. Both the peroxo species [W2O3(O2)4]2- and {PO4[WO(O2)2]4}3- showed high efficiency in the degradation of chitosan, indicating that the degradation mechanism did not follow the radical mechanism. That means •OH is not the active species, which has been proven by the fluorescence spectra. H2O2 acted as an oxidant to regenerate the active W(O2) sites in the depolymerization of chitosan. The developed catalyst (TBA)3{PO4[WO(O2)2]4} is recoverable.
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, People's Republic of China.
authors: Zhanwei
authors: Z
authors: Ma
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, People's Republic of China.
authors: Wenyan
authors: W
authors: Wang
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, People's Republic of China.
authors: Ying
authors: Y
authors: Wu
authors: Department of Material Physics, Zhejiang Normal University, Jinhua, People's Republic of China.
authors: Yiming
authors: Y
authors: He
authors: Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, People's Republic of China.
authors: Tinghua
authors: T
authors: Wu
mesh_terms: D002384:Catalysis; D048271:Chitosan / Q000737:chemistry / Q000378:metabolism*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D010084:Oxidation-Reduction; D014414:Tungsten / Q000737:chemistry; D017973:Tungsten Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D017973:Tungsten Compounds; D014867:Water; D017665:Hydroxyl Radical; D048271:Chitosan; C045951:tungstate; D014414:Tungsten