Preparation and characterization of carboxymethyl tamarind gum

Carboxymethyl tamarind was prepared from tamarind gum as raw material using ethanol as solvent.The effects of the dosages of ethanol and chloroacetic acid,etherification temperature and time,amount of sodium hydroxide,sodium hydroxide and chloroacetic acid molar ratio,and alkalization temperature and time on the degree of substitute(DS) of carboxymethyl tamarind gum were investigated.The optimum conditions for preparing carboxymethyl tamarind gum were acquired through orthogonal experiments.The structure of the product was characterized by means of infrared spectroscopy.The results indicated that the degree of substitution of the modified tamarind gum can reach more than 0.5,the analysis of infrared spectrum shows the structure of the gum was successfully grafted with carboxymethyl groups,and the water solubility and viscosity stability of carboxymethyl tamarind gum are significantly improved.