Variations Of Results Obtained In Ethanol Fermentation Tests When Pressed Yeast Was Used As Inoculum

Abstract

The use of nine different lots of pressed yeast as inocula in ethanol fermentation tests led to relatively small variations of the ethanol yield (percentual standard deviation = 3.9%), of the ethanol productivity (percentual standard deviation = 2.9%) and of the maximum ethanol production rate (percentual standard deviation = 3.8%) when well controlled synthetic medium was used. The above percentual standard deviations were 6.6%, 9.45 and 7.7%, respectively, when sugar-cane fermentation media were used.