Using pH-Shifting Process to Recover Proteins for Low Salt Gel Products from Silver Carp

The pH-shifting processes (include acid and alkali process) and conventional water-wash process was applied to recover protein from bony silver carp muscle. And the new process was evaluated to obtain proteins for low salt (0% and 1% NaCl, w/w) fish products. The alkali isolated protein (AK) exhibited the best solubility at all salt concentrations. Furthermore, the AK had the highest gel strength and water binding capacity at low salt concentrations (0% and 1%). Low salt products of AK containing 1% salt showed similar mechanical properties to the water wash surimi (WM) obtained with 2% salt. The results obtained showed that the alkali process is a good method to recover functional proteins from boney silver carp muscle for low salt fish products.