Textural and rheological properties of Pacific whiting surimi as affected by nano-scaled fish bone and heating rates

摘要

Textural and rheological properties of Pacific whiting (PW) surimi were investigated at various heating rates with the use of nano-scaled fish bone (NFB) and calcium chloride. Addition of NFB and slow heating improved gel strength significantly. Activity of endogenous transglutaminase (ETGase) from PW surimi was markedly induced by both NFB calcium and calcium chloride, showing an optimal temperature at 30 degrees C. Initial storage modulus increased as NFB calcium concentration increased and the same trend was maintained throughout the temperature sweep. Rheograms with temperature sweep at slow heating rate (1 degrees C/min) exhibited two peaks at similar to 35 degrees C and similar to 70 degrees C. However, no peak was observed during temperature sweep from 20 to 90 degrees C at fast heating rate (20 degrees C/min). Protein patterns of surimi gels were affected by both heating rate and NFB calcium concentration. Under slow heating, myosin heavy chain intensity decreased with NFB calcium concentration, indicating formation of epsilon-(gamma-glutamyl) lysine cross-links by ETGase and NFB calcium ion. (C) 2015 Elsevier Ltd. All rights reserved.