ETHANOL PRODUCTION USING RED BEET JUICE BY SACCHAROMYCES CERVISIAE
ATCC 9763
Venegas-Sánchez Josué Addiel and Jiménez Islas Donaji
Huichapan Higher Technological Institute, Renewable Energy, El Saucillo, Huichapan, Hidalgo,
Mexico
Abstract
In Mexico, red beet (Beta vulgaries L. conditiva) is available all the year, therefore its juice and
bagasse can be used for bioethanol production. In this work was investigated the ethanol production
by Saccharomyces cervisiae ATCC 9763 using juice red beet at pH = 2.8 and 37 °C. The rates of
biomass growth, sugar consumption and ethanol production during batch fermentation of red beet
juice were estimated. The logistic, Pirt, and Luedeking-Piret equations were used to model the microbial growth X(t),
substrate consumption S(X), and ethanol production P(X), respectively. The volumetric ethanol productivity (Qp) and
ethanol production (P) were 0.86 g L-1 h-1 and 28 g L-1, respectively. The maximum specific growth rate (μ
max) and
maximum biomass concentration (X
max) were 0.23 h-1 and 1.95 g L-1, respectively. These results indicate that a
significant portion of the carbon source was used for maintenance of strain, which agrees with the fact that the lowest
values of Xmax obtained under these fermentation condition. The strain of
Saccharomyces cervisiae ATCC 9763
utilized in this study was able to produce ethanol with high yield and volumetric productivity under acid and thermal
stress condition.