以过氧钨酸盐为化学剪刀将壳聚糖氧化降解为低分子水溶性壳聚糖。
Oxidative degradation of chitosan to the low molecular water-soluble chitosan over peroxotungstate as chemical scissors.
作者信息
Ma Zhanwei, Wang Wenyan, Wu Ying, He Yiming, Wu Tinghua
机构信息
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, People's Republic of China.
Department of Material Physics, Zhejiang Normal University, Jinhua, People's Republic of China.
出版信息
PLoS One. 2014 Jun 27;9(6):e100743. doi: 10.1371/journal.pone.0100743. eCollection 2014.
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.
低分子水溶性壳聚糖是在一系列具有活性W(O₂)位点的催化剂存在下，通过壳聚糖的解聚反应制备而成。过氧物种[W₂O₃(O₂)₄]²⁻和{PO₄[WO(O₂)₂]₄}³⁻在壳聚糖降解中均表现出高效性，这表明降解机制并非遵循自由基机制。这意味着•OH不是活性物种，荧光光谱已证实了这一点。在壳聚糖解聚过程中，H₂O₂作为氧化剂用于再生活性W(O₂)位点。所开发的催化剂(TBA)₃{PO₄[WO(O₂)₂]₄}是可回收的。
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