Extraction Rate of Water-soluble Protein from Several-sized Fish Flesh

Studies on Washing of Fish Flesh (Part II)

Abstract

Extraction rates of water-soluble protein from flesh of Alaska-pollack and from a porous plate which had been immersed in protein solution were studied. Measurements of mass transfer rate from sliced fleshes were carried out on both cases which the directions of mass transfer were perpendicular to and parallel to the direction of fiber. Mass transfer rate from crushed fleshes and porous plate were also determined. The rate of mass transfer of which direction was parallel to the direction of fiber was greater than the other. Mechanisms of mass transfer were different for each direction. The transfer rates were the function of t/L^1.5 for the direction parallel to fiber, and t/LL² for the other. But both extraction curves drawn respectively as the function of t/L^1.5 and of 0.28t/LL² were coincidence with each other. The rate of extraction from crushed fieshes was explained approximately by equation which was derived by considering distribution of diffusivity with D/LL²=9.38×10^-5(1/sec.), y(=D/δ)=1.15 for plain sheet or with D/aa²=1.45×10^-4(1/sec.), y=1.15 for cylinder. On the other hand, the rate of extraction from a porous plate was well explained by the equation with kD (=ππ²D/LL²)=5.33×10^-5(1/sec.), y=1.15, and D/DNaCl=0.36 was obtained in porous plate.