Effect of Irradiated Sugar Solutions on Growth of Microorganisms

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Effect of gamma-irradiated sugar solutions on the growth of E. coli and Ps. fluorescence was investigated by comparison of time delay in the log-phase growth with the addition of irradiated sugar solution on the basal synthetic medium (Table 1). The results obtained with glucose and fructose are shown in Tables 3 and 4. In either sugars, a marked inhibitory effect on the growth of bacteria was observed even with 0.1 M rad when the irradiation was done under aeration, and the effect was considerably weakened by the heating at 120°C after irradiation. While with the irradiation under air free condition, the effect was found only in fructose with the doses above 0.1 M rad, but it was not so clear in glucose even with 1.0 M rad. And interestingly, in this case the heat treatment diminished the effect of fructose and, on the contrary, enhanced that of glucose. Among the various sugars tested here, (shown in Table4 and 5), xylose, ribose, arabinose, and gluconic acid exhibited a stronger inhibitory effect than that of glucose, on the other hand, galactose, mannose, and glucuronic acid showed only a weak or no effect. The tendency is almost the same with different conditions of irradiation (in air or in N2) and microorganism. From the results obtained in this work, it seems to say that the toxicity of irradiated sugar solutions may not bearised from a simple factor but the inhibitory effect maybe caused by several factors of different type in toxicity and contribution of each factor will be dependent on the experimental conditions such as testing sugar, irradiation condition, and after treatment. The chemical investigations about isolation and identification of toxic factors in each sugar are in progress and will be presented in elsewhere.
日本食品照射研究協議会の論文

Effect of Irradiated Sugar Solutions on Growth of Microorganisms

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日本食品照射研究協議会 | 論文

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