HGG (Hydroxypropyl guar gum) was synthesized by phase transfer catalysis for the first time. The effects of alkalinity, phase transfer catalyst, etherification, pH value, temperature, reaction time and stirring spee...HGG (Hydroxypropyl guar gum) was synthesized by phase transfer catalysis for the first time. The effects of alkalinity, phase transfer catalyst, etherification, pH value, temperature, reaction time and stirring speed were investigated. An optimal synthetic reaction technology was established, namely, dose of guar gum is 100 g, propylene oxide 40-50 g, HTAC (hexadecyl trimethyl ammonium chloride ) 1.3-1.7 g, pH value 10-10.5, temperature 45-50℃, and reaction time 3-4 hours. The result shows that the improved HGG has high viscosity. Its dissolution speed, content of insoluble residue, colloid light transparency and stability are apparently superior to guar flour.展开更多
Hydroxypropyl guar gum was prepared based on the reaction of guar gum and propylene oxide.The value of molar substitution was 0.32 and the proportion of two sorts single sugar was 1∶1.67 determined by （）1H-NMR.（）...Hydroxypropyl guar gum was prepared based on the reaction of guar gum and propylene oxide.The value of molar substitution was 0.32 and the proportion of two sorts single sugar was 1∶1.67 determined by （）1H-NMR.（）13C-NMR can be used to assume the connection between guar gum and Hydroxypropyl and evaluate the length of hydroxypropyl which was 2～8.展开更多
文摘HGG (Hydroxypropyl guar gum) was synthesized by phase transfer catalysis for the first time. The effects of alkalinity, phase transfer catalyst, etherification, pH value, temperature, reaction time and stirring speed were investigated. An optimal synthetic reaction technology was established, namely, dose of guar gum is 100 g, propylene oxide 40-50 g, HTAC (hexadecyl trimethyl ammonium chloride ) 1.3-1.7 g, pH value 10-10.5, temperature 45-50℃, and reaction time 3-4 hours. The result shows that the improved HGG has high viscosity. Its dissolution speed, content of insoluble residue, colloid light transparency and stability are apparently superior to guar flour.
文摘Hydroxypropyl guar gum was prepared based on the reaction of guar gum and propylene oxide.The value of molar substitution was 0.32 and the proportion of two sorts single sugar was 1∶1.67 determined by （）1H-NMR.（）13C-NMR can be used to assume the connection between guar gum and Hydroxypropyl and evaluate the length of hydroxypropyl which was 2～8.
