Bioactivities of surimi from southern blue whiting prepared by different ways

Surimi is stabilized minced fish meat that is washed with water and blended with cryoprotectants. In this study, surimi from southern blue whiting (Micromesistius australis), surimi not subjected to washing entailing several changes of cryoprotectants following Patent WO/2003/013280 (hereafter termed unwashed surimi), heated surimi samples, and their hydrolysates were prepared to compare their compositions and bioactivities. Methanolic extracts of surimi and their hydrolysates were prepared for further analysis. The heated surimi samples showed different characteristics from the raw materials and released amino acids with enzymatic treatment. Unwashed surimi showed a significantly stronger 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity than surimi, and its effect on radical scavenging was compatible with that of southern blue whiting muscle. There was no significant difference in angiotensin converting enzyme inhibitory activity between unwashed and washed surimi. Soybean lipoxygenase was inhibited by heated unwashed surimi, indicating that unwashed surimi can be used for soymilk and its products.