FOOD SCIENCE ›› 2008, Vol. 29 ›› Issue (6): 100-103.

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Effect of Extreme pH Treatment on Heat-induced Denaturation,Aggregation,and Gelling Properties of Myofibril from Silver Carp

 FU  Xiang-Jin, XU  Shi-Ying, WANG  Zhang, JINMOON  Kim   

  1. 1. School of Food Science and Technology, Jiangnan University; 2. State Key Laboratory of Food Science and Technology, Jiangnan University
  • Online:2008-06-15 Published:2011-08-26

Abstract: The pH-shifting process is a new method for extracting fish protein of surimi, and the new method can increase the protein recovery rate, but the extreme pH (2.3 and 11.8) conditions in the pH-shifting process affect the thermal properties of myofibril. Understanding this kind of effect can provide theory support to the new process. Extreme pH treatment causes the part denaturation of myofibril, after the acid treatment the myosin denatures entirely, and the denaturation temperature of actin decreases from 81 ℃ to 77.6 ℃; Alkali treatment decreases the denaturation temperature of myosin and actin. Both acid and alkali treatments cause aggregation of myofibril, but the acid treatment more obviously. Correspondingly, the thermal gelling behavior changes, and gel strength decreases markedly. Myofibril treated by acid has the lowest gel strength. Therefore, alkali treatment is more suitable than acid treatment in the pH-shifting process.

Key words: extreme pH treatment, myofibril, thermal denaturation, thermal aggregation, gelling