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Journal of Food Quality
Volume 2017 (2017), Article ID 2784146, 10 pages
https://doi.org/10.1155/2017/2784146
Research Article

Effect of Low-Frequency Ultrasonic-Assisted Enzymolysis on the Physicochemical and Antioxidant Properties of Corn Protein Hydrolysates

1School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu 212013, China
2Jiangsu Provincial Key Laboratory for Physical Processing of Agricultural Products, Zhenjiang, Jiangsu 212013, China
3Department of Agricultural and Food Engineering, University of Uyo, PMB 1017, Uyo 520003, Nigeria

Correspondence should be addressed to Haile Ma; nc.ude.sju@lhm

Received 21 March 2017; Accepted 2 May 2017; Published 20 June 2017

Academic Editor: Srinivas Janaswamy

Copyright © 2017 Qiufang Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to investigate the effect of low-frequency ultrasound on the enzymolysis of corn protein. A L9 (34) orthogonal design was used to optimize ultrasound pretreatment conditions. Degree hydrolysis (DH), conversion rate of protein (CR), and DPPH IC50 were selected as analytical indicators. Under the optimal ultrasound conditions (5 W/L power, 2 s/2 s on/off time, 50°C temperature, and 25 min time), the DH, CR, and radical (, ) scavenging capacities were significantly increased. Molecular weight distribution and amino acid profile analysis showed that ultrasound pretreatment enhanced the formation of short-chain peptides with molecular weight of 200–3000 Da, especially the peptides containing hydrophobic amino acids. Moreover, 40 potential antioxidant peptides were purified by C18 semipreparative column and identified by UPLC-ESI-MS. The results suggest that the optimal ultrasonic-assisted enzymolysis technology could be useful for preparation of antioxidant peptides from corn.