Effects of Ultrasound on Crystallization of Cassava Starch

[Objective] The research aimed to study the effects of ultrasound on the particle shape of cassava starch.[Method] Polarizing microscope was used to study cassava starch treated by ultrasound.[Result] The optimum ultrasonic treatment of cassava starch was as follows: 5% sodium sulfate as solvent,content of cassava starch 16.7%,ultrasonic power 400 W and irridation time 300 s.The cross-polarized state of cassava starch granules showed weakening or disappearance and cassava starch granules crystal structure reduced or lost.[Conclusion] Ultrasonic irridation destroyed the crystalline structure of starch,and increased its contact area of particle surface and reactivity.