Effects of γ-Irradiation on the Stability and Activity of Nucleic Acid Related Substances and Enzymes in Some Mushrooms
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概要
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Mushroom (<I>Psalliota bisporus</I>), and. Shii-take (<I>Lentimus edodes</I>) were irradiated from tne dose of 5 to 50×10<SUP>5</SUP> rad with γ-ray, and the changes in nucleic acid related substances were measured by chromatography with a Dowex 1×8 column.<BR>ATP of mushroom and Shii-take disappeared at the dose of 5×10<SUP>6</SUP>rad, but ADP of those remained in as much as initial amounts (Figs. 1 and 2, Tables 1 and 2). The changes in the amounts of mononucleotides were negligible.<BR>Preliminary experiments were made on the extractability of nucleic acid related enzymes from mushrooms. Extracted enzyme solutions from mushrooms were subjected to γ-irradiation, as .a result their ribonuclease, phosphodiesterase and DhoslDhomonoesterase activities remained moderatelyeven at a high dose of 5×10<SUP>6</SUP> rad (Figs, 3 and 4).<BR>It seems reasonable to consider that there is a possibility of the breakdown of nucleic acid related substances by remaining enzymes during the storage after γ-irradiation.
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