1Department of Food Science and Technology, Ocean College, Zhejiang University of Technology, Hangzhou, P. R. China
Journal of Food and Nutrition Research.
2015,
Vol. 3 No. 7, 471-477
DOI: 10.12691/jfnr-3-7-9
Copyright © 2015 Science and Education PublishingCite this paper: Jianhua Liu, Fei Lyu, Xuxia Zhou, Bin Wang, Xinping Wang, Yuting Ding. Preparation of Skipjack Tuna (
Katsuwonus pelamis) Protein Hydrolysate Using Combined Controlled Enzymatic Hydrolysis and Glycation for Improved Solubility and Emulsifying Properties.
Journal of Food and Nutrition Research. 2015; 3(7):471-477. doi: 10.12691/jfnr-3-7-9.
Correspondence to: Yuting Ding, Department of Food Science and Technology, Ocean College, Zhejiang University of Technology, Hangzhou, P. R. China. Email:
dingyt@zjut.edu.cnAbstract
Preparation of the hydrolysate from under-utilized skipjack tuna (Katsuwonus pelamis) protein with improved functional properties using combined controlled enzymatic hydrolysis and glycation was investigated. Five enzymes including alcalase, flavorase, neutrase, trypsin and protamex were performed to hydrolysis under the optimum conditions. The results showed that 5-hour hydrolysis led to increases in degree of hydrolysis (DH) and amino acids content, and change in soluble protein content. To obtain considerable small-size peptides, a controlled enzymatic hydrolysis (2.5 h) by trypsin was carried out. This condition produced nearly 80% soluble protein which could not be precipitated by 10% TCA. The resulting hydrolysate was then subjected to glycation with alginate at 60 °C and 65% relative humidity for 3 hours. Functional properties assay showed that glycation significantly increased (P<0.05) the solubility, emulsifying activity index (EAI) and emulsion stability index (ESI). This work suggested that the controlled enzymatic hydrolysis in combination with glycation would effectively improve the functional properties of fish protein hydrolysates.
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