Carboxymethyl starch(CMS)was made by carboxylating the sweet potatostarch with chloracetic acid.Some physicochemical properties and textural characteristics ofthe CMS were investigated.The result show that the gelatinizating temperature and sharingresistance were decreased,the solubility,swelling power,paste clarity and viscosity wereobvious’y increased, and the freeze-thaw stability was also increased significantly comparedwith the native starch.The carboxymethylating of native starch occured not only on the sur-face,but also in the interior of the st...