title: Modification of hydroxypropyl guar gum with ethanolamine.
abstract: 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 °C and the reaction could reach equilibrium state when it was carried out for 10h at 25 °C. For the nucleophilic substitution of tosyl group with ethanolamine, the reaction was completed after 10h reaction at 50 °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.
authors: Key Laboratory of Green Chemistry and Technology, College of Chemistry, Sichuan University, Chengdu 610064, China.
authors: Yongchao
authors: Y
authors: Zhao
authors: Jianping
authors: J
authors: He
authors: Xiaoxiao
authors: X
authors: Han
authors: Xiulin
authors: X
authors: Tian
authors: Mingyu
authors: M
authors: Deng
authors: Weiping
authors: W
authors: Chen
authors: Bo
authors: B
authors: Jiang
mesh_terms: D002384:Catalysis; D019856:Ethanolamine / Q000737:chemistry / Q000494:pharmacology*; D005685:Galactans / Q000138:chemical synthesis* / Q000737:chemistry / Q000648:ultrastructure; D055772:Green Chemistry Technology / Q000379:methods; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000138:chemical synthesis* / Q000737:chemistry / Q000648:ultrastructure; D008954:Models, Biological; D053149:Plant Gums / Q000138:chemical synthesis* / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D011134:Polysaccharides; C519976:hydroxypropyl guar; D019856:Ethanolamine; C007894:guar gum