不同分子量魔芋葡甘露低聚糖的流变特性

化工进展

不同分子量魔芋葡甘露低聚糖的流变特性

姚雪，罗学刚，韩本超，贺攀

西南科技大学生物质材料教育部工程研究中心，四川绵阳 621010

出版日期:2011-11-05 发布日期:2011-11-05

Rheological properties of konjac oligo-glucomannan with various molecular weights

YAO Xue，LUO Xuegang，HAN Benchao，HE Pan

Engineering Research Center of Biomass Materials，Ministry of Education，Southwest University of Science and Technology，Mianyang 621010，Sichuan，China

Online:2011-11-05 Published:2011-11-05

摘要/Abstract

摘要：

探讨了碱存在下不同分子量魔芋葡甘露低聚糖（KOGM）的流变特性。采用高级旋转流变仪和凝胶渗透色谱-静态光散射联用仪（SEC-MALS）测定魔芋葡甘露低聚糖的分子量、相关分子参数和流变性质。SEC-MALS分析结果表明，随KOGM分子量的下降，均方根旋转半径迅速减小，相对刚性参数β从0.38增加到0.80，即分子链由半柔顺性链向短小的刚性链转变。流变分析结果表明，所形成凝胶的储能模量G'和耗能模量G''均随着KOGM相对分子量、KOGM浓度和碱浓度的增加而增加，损耗因子tand 则相应减少，即形成凝胶的弹性和稳定性增加。

Abstract:

Rheological property of konjac oligo-glucomannan（KOGM）with various molecular weights in the presence of alkali（sodium carbonate）was studied by dynamic viscoelastic measurements. Molecular weight and other molecular parameters of KOGM were determined by SEC-MALS. The results show that radius of gyration（R_g）decreases and the relative stiffness parameter（β）increases from 0.38 to 0.80 with the decrease of molecular weight（M_w），which means KOGM chains become short and stiff. The storage shear modulus G' and the loss shear modulus G'' increase and loss factor tand decrease with the increasing of KOGM M_w，KOGM concentration and alkali concentration，which indicates that the gels get more elastic and stable.

姚雪，罗学刚，韩本超，贺攀. 不同分子量魔芋葡甘露低聚糖的流变特性[J]. 化工进展.

YAO Xue，LUO Xuegang，HAN Benchao，HE Pan. Rheological properties of konjac oligo-glucomannan with various molecular weights[J]. Chemical Industry and Engineering Progree.