Optimization of ultrasonic-assisted preparation of dietary fiber from corn pericarp using response surface methodology


Correspondence to: Ligen Wu, School of Food Science and Technology, Henan University of Technology, Zhengzhou, Henan Province, 450001, China. E-mail: wuligen2012@hotmail.com



Corn pericarp, which is an industrial waste of corn starch production, is an important source of dietary fiber in cereals, with claimed health benefits. However, they used to be discarded or utilized as animal feed. The application of pre-ultrasound treatment is critical for achieving rapid preparation of desired components from plant materials and for preserving structural and molecular properties of these compounds. Ultrasonic-assisted preparation was used to produce dietary fiber from corn pericarp using response surface methodology.


The optimal particle size of corn pericarp (mesh size 40), the ratio of liquid to solid (25 mL g−1), ultrasonic power (180 W) and ultrasonic time (80 min) were determined based on response surface methodology analysis. The interaction effects of particle size of corn pericarp and ultrasonic time had a highlysignificant effect on the yield of dietary fiber, and a significant effect was shown by ultrasonic power and ultrasonic time.


The maximum yield of dietary fiber was 86.84%, which agreed closely with the predicted value. Using ultrasonic-assisted preparation, it may be possible to enhance the yield of dietary fiber from corn pericarp. © 2013 Society of Chemical Industry