Recovery ð%Þ ¼ amount of hydrolysateðgÞ=total protein amount in the pretreated SSR ðgÞ 100
Two approaches for the ultrasonic probe-assisted enzymolysis were adopted. One was that the defatted SSR was pretreated with ultrasound followed by the enzymolysis. The other was that the enzymolysis of the defatted SSR was carried out under ultrasound.