EFFECT OF GAMMA-IRRADIATION ON METHIONINE AND TRYPTOPHAN CONTENT IN SOYA PROTEIN PRODUCTS

Effect of gamma irradiation on the content of methionine and tryptophan in soya protein products were investigated. Irradiation with doses of 1, 3 and 5 kGy caused significant (p = 0.05) decrease of methionine contents. Parallel with the decrease in methionine also the relative quality of proteins. is lowered. Tryptophan content were significantly reduced (p = 0.05) at irradiation doses of 3 and 5 kGy. The relative decrease of methionine and tryptophan contents are significantly correlated (p = 0.05) with relative increase in amount of products by the irradiation induced oxydation of lipids; correlation coefficients were 0.576 and 0.715.