Effects of60Co-gamma Rays on Defatted Soybean Powder

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The soybean powder which is a protein-rich material inmanufacturing some processed foods is mostly contaminatedwith various types of microorganisms including appreciablenumbers of heat-resistant cells. In this study, effects of60Co gamma irradiation on defatted soybean powder samplesobtained from the hexane-extraction process as a by-productwere investigated. The results are as follows: (1) Allsamples were sterilized with 8×105rads and survivors weredecreased to the level of 102cells/g by 5×105rads. (2) As shown in Figs.1 and 2, two-component-type survivalcurves were obtained with both the soybean powder and thecell suspension of an isolated bacterium. D10values areindicated in the figures. (3) No significant deteriorativeeffect of irradiation (less than 1 Mrads) on the colour andodour of the sample while viable numbers of microorganismswere suppressed during storage after irradiation. (4) Theα-amylase activity of the soybean powder was not decreased with doses up to 2 Mrads
日本食品照射研究協議会の論文