Mn(Ⅱ)对壳聚糖降解制备低聚壳聚糖的影响  

Effect of Mn (Ⅱ) on the degradation preparation of low molecular weight chitosan from chitosan

作　　者：尹学琼[1] 张晓利[1] 林强[1] 冯玉红[1] 于文霞[1] 张岐[1] 

机构地区：[1]海南大学化工系,海南海口570228

出　　处：《化学试剂》2005年第4期193-196,共4页Chemical Reagents

基　　金：国家自然科学基金资助项目(20061001)海南省自然科学基金资助项目(20304)。

摘　　要：将壳聚糖进行液态均相配合反应制得壳聚糖锰配合物,IR、元素分析及热分析等检测证实了壳聚糖锰配合物中配位键的存在,且显示壳聚糖锰配合物存在有利于壳聚糖高分子链断裂的弱势结构。以H2O2对壳聚糖-Mn(Ⅱ)配合物及壳聚糖进行氧化降解,考察降解过程中粘度的变化及降解产物分子量分布,在相同的降解条件下,壳聚糖锰配合物的降解速度明显高于壳聚糖,且降解产物分子量分布较壳聚糖直接降解窄。对壳聚糖锰配合物降解反应动力学研究表明壳聚糖锰配合物对H2O2分解不存在催化作用,其降解反应与壳聚糖的差异只与其结构有关。对降解产物进行脱金属处理,所得低聚壳聚糖含锰量为O。Complex of chitosan and Mn(Ⅱ)(CTS-Mn) was prepared through liquid homogeneous coordination. IR, elemental analysis, and thermal analysis were conducted for the complex and chitosan. The results showed that there was coordinating bond between chitosan and Mn (Ⅱ) , and these was some structure which was easy to be broken in the complesx.H2O2 was used to degrade CTS-Mn and chitosan,the viscosity variation and molecular distribution of degraded products were investigated. In the same conditions, degradation velocity of CTS-Mn was obviously faster than that of chitosan, and the molecular distribution of the former was much narrower than that of the latter. Reaction dynamic studies showed that CTS-Mn had no catalytic effect on the decomposition of H2O2, and the difference between CTS-Mn degradation and chitosan degradation was mainly due to the structure difference between CTS-Mn and chitosan. Delaminating Mn (Ⅱ) on the degraded complex with cation exchange resin, low molecular weight chitosan with 0 Mn content was obtained.

关 键 词：壳聚糖锰配合物 壳聚糖 氧化降解 低聚壳聚糖 

分 类 号：O636[理学—高分子化学]