Study on Preparation of Wheat Starch Phosphate Ester with Low Degree of Substitution and Its Characteristics
In this experiment,wheat starch was used as a raw material to prepare wheat starch phosphate ester by esterification with pyrophosphate. The half - wet production was adopted to synthesize starch phosphate ester. The conditions were as follows: pH 5.9, reaction temperature 150℃, reaction time 75 min, ratio of pyrophosphate to starch(db) 0.0287. The degree of substitution of the produced modified starch was 0.0221, the starch paste clarity was increased from 3.70% to 20.80%, the viscosity from 34 Pa·s to 3 700 Pa·s. Meanwhile the syneresis was reduced from 46.88% to 6.56%.