清酒酵母の代謝に関する研究 : (第3報)清酒酵母の増殖, 呼吸および醗酵におよぼすフェネチルアルコールの効果

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This paper deals with the effect of α- and β-phenethyl alcohol (PEA) on the respiration and fermentation systems of Sacch. sake. Both α- and β-PEA lowered the growth rate of this yeast markedly at concentrations randing from 0.1 to 0.2%, when the cells were cultivated aerobically in a synthetic medium. The Qo_2 values of cells grown aerobically with 0.15% of α- and β-PEA (PEA grown cells) were lower than that of "normal cells" (cells grown without PEA). Especially, the Qo_2 value of α-PEA grown cells was nearly zero. On the other hand, the Qco_2 values of α- and β-PEA grown cells were higher.contents of cytochrome c, coenzyme Q and vitamin B_2 were not infruenced by α- and β-PEA, but the peaks of cytochrome a and b in absorption spectra of α- and β-PEA grown cells were decreased or diminished. Of the respiratory enzymes, cytochrome c oxidase was most influenced by α- and β-PEA; the specific activities of α- and β-PEA grown cells were zero adn about 20% of the normal cells, respectivery. NADH : cutochrome c oxidoreductase and succinate : cytochrome c oxidoreductase were not so much influenced by α- and β-PEA as cytochrome c oxidase.on the other hand, the specific activities of alcohol dehydrogenase of α- and β-PEA grown cells were much higher than that of the "normal cells" and ethanol production by the former increased under aerobic conditions.NAD contents of α- and β-PEA grown cells were lower and NADH contents were higher than those of the "normal cells".From these facts, the following is suggested; since α-PEA grown cells lack the respiratory activity by the interference of cytochrome c oxidase biosynthesis by α-PEA, they can not regenerat NAD necessary for glycolysis from NADH. Therefore, the alcohol dehydrogenese reaction is enhanced for reproduction of NAD, which consequently causes to stimulate alcohol fermentation.
社団法人日本生物工学会の論文
1971-01-25

清酒酵母の代謝に関する研究 : (第3報)清酒酵母の増殖, 呼吸および醗酵におよぼすフェネチルアルコールの効果

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