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내당 내알콜성 Saccharomyces cerevisiae 의 알콜 발효에 미치는 soybean meal 의 영향
유주현,노민정,박경호,백운화 한국농화학회 1991 Applied Biological Chemistry (Appl Biol Chem) Vol.34 No.1
In order to improve the productivity of ethanol by sugar-alcohol-tolerant Saccharrnnyces cerevisiae Dl, the effect of addition of soybean meal on the alcohol fermentaton was investigated. The addition of soybean meal led to the increase of the ethanol productivity and viable cell concentration. Increasing the amount of soybean meal increased the number of viable cells and the consumption percentage of glucose. The water-soluble fraction of soybean meal was nearly as effective as whole-soybean meal, whereas the lipidic fraction had no positive effect. The addition of 4% soybean meal increases the rate of ethanol production regardless of the initial concentrations of glucose. The rate of glucose consumption fermenting a soybean mil supplemented mecum was higher than possible in a non-supplemented medium, either in the absence or in the presence of ethanol. But the percentage of ethanol inhibition of the glucose consumption rate was identical for supplemented and unsupplemented media The increase of final ethanol concentration could not be attributed to an increase of ethanol tolerance of yeast cells but to the satisfaction of nutritional deficiencies.
내당 내알콜성 Saccharomyces cerevisiae 의 알콜 발효에 미치는 calcium 의 영향
유주현,노민정,백운화,양지영 한국농화학회 1991 Applied Biological Chemistry (Appl Biol Chem) Vol.34 No.1
In order to improve the productivity of ethanol by sugar-alcohol-tolerant Saccharomyces cerevisiae Dl, the effect of addition of Ca^(2+) on the alcohol fermentation was investigated. The addition of Ca^(2+) led to both the improvement of ethanol productivity and the increase of viable cell concentration. The optimal concentration of Ca^(2+) was 0.8 mM. The higher was initial concentration of glucose, the greater effect of Ca^(2+) was observed. Ethanol inhibition of growth, specific death rate in lethal concentration of ethanol, and extracellular final pH decreased by the addition of Ca^(2+). The effect of Ca^(2+) supplementation was explained by the increase of its ethanol tolerance.