Modification of hydroxypropyl guar gum with ethanolamine

作者：Zhao Yongchao; He Jianping; Han Xiaoxiao; Tian Xiulin; Deng Mingyu; Chen Weiping; Jiang Bo^*

来源：Carbohydrate Polymers, 2012, 90(2): 988-992.

DOI：10.1016/j.carbpol.2012.06.032

• Hydroxypropyl guar gum
• Ethanolamine
• Nucleophilic substitution

A new guar gum derivative containing amino group was synthesized through nucleophilic substitution of p-toluenesulfonate activated hydroxypropyl guar gum with ethanolamine. For the preparation of p-toluenesulfonate esters hydroxypropyl guar gum, the results showed that the reaction rate was optimal at 25 degrees C and the reaction could reach equilibrium state when it was carried out for 10 h at 25 degrees C. For the nucleophilic substitution of tosyl group with ethanolamine, the reaction was completed after 10 h reaction at 50 degrees C. The structures of products were characterized by NMR and FT-IR spectroscopy. The results showed that the p-toluenesulfonate esters can be effectively substituted by ethanolamine to form the hydroxyethyl amino hydroxypropyl guar gum (EAHPG). The content of nitrogen of EAHPG was determined by acid-base titration and element analysis.

• 出版日期2012-10-1
• 单位四川大学