Study On Carboxymethylinulin

Carboxymethylinulin is renewable, biodegradability, non-toxic and environmental friendly.Carboxymethylinulin, carboxymethyl starch and carboxymethyl cellulose are carboxymethylation polysaccharide,and the hind both have a wide range of applications.Carboxymethylinulin can substitute for carboxymethyl starch and carboxymethyl cellulose in some fields and have broad development prospects.Through single factor and orthogonal experiments, the effect of various factors on the carboxymethylinulin degree of substitution was studied. The study laid theoretical foundation for the industrial application of carboxymethylinulin.There were three kinds of inulin, inulin a, inulin b, inulin c. Through chemical analysis and HPLC analysis, we get inulin a is raw inulin, inulin b and inulin c are refined inulin. inulin b is short-chain inulin, inulin c is long-chain inulin.According to different materials, there were two methods for the preparation of carboxymethylinulin were used. The results showed that the optimum conditions for the preparation of carboxymethylinulin.(1)water-borne method, The mixture of inulin(inulin a), sodium hydroxide, chloroacetic acid(mole ratio=1:6:3),the reaction temperature is50℃, the reation time is4h. and the DS of CMI is1.33.(2)solvent method, the mixture of inulin (inulin b,inulin c), sodium hydroxide,chloroacetic acid (mole ratio=1:2.5:1.5), the temperature of basification is35℃, the basify time is0.5h, the etherifieation temperature is50℃. the etherifieation time is3h and ethanol (v/v=0.95.40mL), and the DS of CMI is0.79(0.87).Through the comparation of the two methods, we got that the DS of CMI by waterborne method was higher than that by solvent method. But the MCA efficiency was lower. The DS of CMI from inulin c was higher than that from inulin b. That may because the DP (degree of polymerization) of inulin which need further study.