A comparative study of physicochemical properties of recovered protein from Japanese anchovy (Engraulis japonicus) isolated by various recovery methods

Abstract

The physicochemical properties of recovered protein from Japanese anchovy using salt water treatment and pH-shift processing were investigated and compared. The protein recovery yield was the highest with the acid-aided treatment, followed by the salt water and alkaline-aided treatments. No significant differences were found between minced fish and the recovered protein using salt water treatment in L* value, b* value and Ca-ATPase activity. Moreover, myofibrillar protein extracted from the recovered protein using salt water and acid-aided treatments exhibited lower surface hydrophobicity than that using the alkaline-aided treatment. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis indicated a greater concentration of myosin heavy chain and actin in the recovered protein by the salt water treatment, while those proteins were degraded in the acid and alkaline-aided treatments. Overall, the results demonstrated that the physicochemical properties of the recovered protein using salt water treatment were superior to those using pH-shift processing.