Effect of Ionizing Radiation on Soybean Protein

Part II. Gelation of cathode-ray irradiated soybean protein solutions

Abstract

Effect of cathode-ray irradiation on the rheological properties of soybean protein (Na-salt) solution was investigated by Rheometer RM-500 manufactured by Shimazu Co.
As increased dose up to 10 Mrads, hysteresis loop of the gelled 10%-soybean protein was varied, so that comparative dimentions of hysteresis loops and yield values of these irradiated solutions were increased. Relative viscosities of these protein solutions were related with dose, but rheological differences between the soybean protein solution and other solutions containing some additives such as urea, cystein, and ascorbic acid were observed.
In other experiments, intrinsic viscosity of these solutions was determined. As a result, variation of intrinsic viscosity of irradiated solution increased strongly at the dose of 0.5 to 1.0 Mrads. Experimental equation between (R) and intrinsic viscosity[η] was as follow;
log[η]=24.5log(R+5.21)-(21.4±0.6)