The binding of key fishy off-flavor compounds (KFOCs), heptanal, octanal, nonanal, and 1-octen-3-ol, to silver carp proteins (total myofibrillar protein, myosin, and actin) was studied. Myosin was the primary binding receptor for all four KFOCs, and it showed the strongest binding at neutral pH and at higher ionic strengths. Thermodynamic models were applied to evaluate the number of binding sites, the binding constant, and the Gibbs free energy for the binding of the KFOCs to myosin. Myosin had approximately 1.0 sites for binding with the three linear-chain aldehydes and about 1.6 sites for binding with 1-octen-3-ol. Moreover, myosin showed the highest affinity for 1-octen-3-ol, and both its binding constant and its number of binding sites with the three linear-chain aldehydes were negatively correlated with the chain length. For all four KFOCs, the trends of the Gibbs free energies were the opposite of those observed for the binding constant and the number of binding sites. These results may provide a theoretical basis for improving the deodorization efficiency of traditional surimi rinsing methods by adjusting the properties of the solutions used.
Squid ink is rich in abundant natural proteins, lipids, and minerals. The aim of this study was to investigate the influences of different types and contents of modified starch with different processes on the stability and fluidity of squid ink sauces.Results of scanning electron microscopy demonstrated that the adsorption quantities of acetylated distarch phosphate (ADSP) were significantly higher than acetylated distarch adipate and hydroxypropyl distarch phosphate. Results of rheological properties and textural characteristics showed that squid ink sauce treated with ADSP had the highest dynamic viscoelasticity and adhesiveness, respectively. Meanwhile, overall quality of squid ink sauce with addition of 150% ADSP showed the highest scores. In addition, squid ink sauce treated with wet process (WP) showed higher stability and smaller particle size than dry process. The effects of processes on the volatile compounds of squid ink sauces were relatively small. In summary, the combination of 150% ADSP and squid ink treated with WP could improve the uniformity and gelling of squid ink sauce.
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