Preparation of starch palmitate by mechanical activationassisted solid phase reaction and its properties

Starch palmitate was prepared by mechanical activation-assisted solid phase reaction with cassava starch as raw material，palmitic acid as esterifying agent，and HCl as catalyst. The effects of various factors on the esterification of starch were investigated respectively by using degree of substitution（DS）of the products as an evaluation index， and the characterization and performance analysis were also carried out. The results showed that the product with a DS value of 0.0108 was prepared under the optimum reaction conditions：cassava starch dosage of 30.0 g，palmitic acid dosage of 12%，2.0 mol/L HCl catalyst dosage of 1.0%，and reaction for 60 min at 60℃. XRD analysis indicated that the crystalline structure of starch was damaged and the crystallinity decreased. FTIR analysis indicated that starch was successfully esterified. Performance analysis indicated that esterified starch possessed better transparency and thermal stability，and lower gelatinization temperature and viscosity.