Preparation process of hydrophobic micro-porous waxy corn starch

The hydrophobic modification of micro-porous waxy corn starch was carried out to enhance its oil absorption rate and improve its application quality by using the wet method. Some factors affecting the oil absorption rate of hydrophobic micro-porous waxy corn starch were: reaction temperature, reaction time, pH value and amount of hydrophobic agent. The microstructure and thermal property were characterized and measured by infrared spectrogram, thermogravimetric analyzer and differential scanning calorimetry, respectively. The results indicated that the oil absorption rate of hydrophobic micro-porous waxy corn starch increased by 43.0%, compared with that of micro-porous waxy corn starch. The optimum process conditions for preparing hydrophobic micro-porous waxy corn starch were as follows: reaction temperature 50℃, reaction time 4 h, pH value 9.0. The peak onset temperature, peak temperature, peak end temperature, enthalpy change of DSC curve of hydrophobic micro-porous waxy corn starch decreased, and the thermal stability of hydrophobic micro-porous waxy corn starch decreased, compared with those of micro-porous waxy corn starch. The research results can provide a reference for the commercial applications of the micro-porous waxy corn starch