Preparation of Acetated Porous Starch with Ultrasonic Treatment

Abstract:

To study the effect of ultrasonic power on preparation of acetated porous starch ，acetated porous starch was prepared under the diffent ultrasonic power and ultrasonic time.The results indicate that the ultrasonic can effect acetylation obviously and under the condition of ultrasonic power is 200 W and time is 150 min，degrees of substitution（DS） is up to 0.055 9 and oil absorption ratio is up to 89.1%. Compared with acetated porous starch without ultrasonic treatment，DS increased by 64.4% and oil absorption ratio increased by 13.9%.The morphology of acetated porous starch has not changed ，but acetated porous starch crystalline regions were destroyed and relative crystallinity discreased by 16.1%.