食品微生物の代謝活性に対するγ線照射の影響 : (第1報)酵母および乳酸菌について

概要

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As a fundamental experiment on the radiosensitivity of metabolic activities in food microorganisms, the effects of γ-irradiation on alcoholic fermentation by yeast and on acid production by lactic acid bacteria were investigated.In the studies employing 2 strains each of Saccharomyces cerevisiae, Sacch. cerevisiae var. ellipsoideus, Sacch. sake and 1 strain of Candida albicans, the enzymatic systems in alcoholic fermentation by yeast seemed mucu more resistant to radiation than yeast cells, because the alcoholic fermentation occured vigorously even after irradiation at a dose of 5 × 10^5 R or more, where scarcely any strain of yeast could form colonies on a plate culture.The lactic acid-forming enzymatic systems in Lactobacillus bulgaricus, Lact. plantarum, Streptococcus lactis and Leuconostoc mesenteroides were also more resistant to radiation than their cells.Skim milk was found to have a highly protective effect against radiation in alcoholic fermentation as well as in yeast celsl. Such radioprotective effect of skim milk was also observed in lactic acid bacteria.
1969-02-25