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IJBT Vol.04(1) [January 2005] >


Title: Potential industrial applications of yeast capable of fermenting high gravity cane molasses despite physiological stress
Authors: Bajaj, B K
Taank, Vikas
Thakur, R L
Keywords: ethanol production efficiency
fermentation
glycerol
high gravity molasses
osmotic stress
Saccharomyces cerevisiae
trehalose
Issue Date: Jan-2005
Publisher: CSIR
IPC CodeInt. Cl.7 C 12 N 1/18, 1/22
Abstract: Two Saccharomyces cerevisiae isolates were studied for their ability to ferment cane molasses of high gravity. Supplements like soybean meal (SM), groundnut meal (GM) or castor oil meal (CM) (@2.5%) were found to be quite effective in enabling the yeast to ferment molasses of high gravity (35-40° brix). Ethanol production efficiency was increased by 45-50% with supplementation of any of these additives to concentrated molasses. The viability of yeast also improved by 24-25% in high gravity molasses. In concentrated worts with no supplement, trehalose content of yeast was increased significantly but little increase was reported in medium supplemented with SM, GM or CM, indicating the stress relieving effect of these supplements. Glycerol content did not vary with increase in the concentration of sugars in the medium. There was also no effect on invertase activity of yeast while fermenting the concentrated molasses worts.
Page(s): 149-152
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.04(1) [January 2005]

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