STUDY ON THE PREPARATION METHOD OF CARBOXYMETHYL KONJAC GLUCOMANNAN

The preparation method for carboxy methylation of konjac glucomannan(KGM)was proposed in this paper according to molecular structural characteristics of KGM.Carboxymethyl konjac glucomannan(CMK)were yielded by first blending konjac glucomannan with etherification agent and then basifying and catalyzing in ethanol.Through single factor and orthogonal experiments,the effects of reaction conditions on degree of substitution(DS)and apparent viscosity(η)were investigated,and the optimum reaction conditions were obtained as follow:55 ℃,pH 12 for 3 hours.The results indicate that the maximal value of DS and η were 0.527 8 and 15.57 Pa·s respectively.