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Nitrogen levels and yeast viability during ethanol fermentation of grain sorghum containing condensed tannins

Abstract

Selected varieties of sorghum, Sorghum bicolor (L.) Moench, give high crop yields and they also return to favorable energy balance in terms of energy calories produced per cultural energy invested. The brown, condensed-tannin, bird- and mold-resistant varieties illustrate these advantages, but their nutritional value and ability to support the expected rate of ethanol fermentation is significantly lower than that of non-brown sorghums. It has been previously shown that the addition of nitrogen to brown sorghum mash supports a high rate of fermentative metabolism without removing the tannins, and suggested that the basis for the inhibition of ethanol fermentation was nitrogen starvation of the yeast cells. In this investigation, it is demonstrated that the addition of protease enzyme to mash results in an increase in amino nitrogen sufficient to support accelerated rates of ethanol fermentation by yeast cells. Thus, the hypothesis commonly cited in the literature that the presumed inhibitor, condensed tannins, function to reduce fermentative metabolism solely via the binding and precipitation of proteins is rejected.
Publication Date:
Jan 01, 1988
Product Type:
Journal Article
Reference Number:
GB-88-002201; EDB-89-001139
Resource Relation:
Journal Name: Biomass; (United Kingdom); Journal Volume: 16:2
Subject:
09 BIOMASS FUELS; ETHANOL; FERMENTATION; SACCHAROMYCES CEREVISIAE; VIABILITY; SORGHUM; BIOMASS; NITROGEN; TANNIC ACID; ALCOHOLS; AROMATICS; BIOCONVERSION; CARBOXYLIC ACIDS; CEREALS; ELEMENTS; ENERGY SOURCES; FUNGI; GRASS; HYDROXY COMPOUNDS; MICROORGANISMS; NONMETALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; PHENOLS; PLANTS; POLYPHENOLS; RENEWABLE ENERGY SOURCES; SACCHAROMYCES; YEASTS; 090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989); 140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
OSTI ID:
6664179
Research Organizations:
Florida Univ., Gainesville (USA). Dept. of Botany
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: BIOME
Submitting Site:
GB
Size:
Pages: 77-87
Announcement Date:

Citation Formats

Mullins, J T, and NeSmith, C. Nitrogen levels and yeast viability during ethanol fermentation of grain sorghum containing condensed tannins. United Kingdom: N. p., 1988. Web. doi:10.1016/0144-4565(88)90017-0.
Mullins, J T, & NeSmith, C. Nitrogen levels and yeast viability during ethanol fermentation of grain sorghum containing condensed tannins. United Kingdom. doi:10.1016/0144-4565(88)90017-0.
Mullins, J T, and NeSmith, C. 1988. "Nitrogen levels and yeast viability during ethanol fermentation of grain sorghum containing condensed tannins." United Kingdom. doi:10.1016/0144-4565(88)90017-0. https://www.osti.gov/servlets/purl/10.1016/0144-4565(88)90017-0.
@misc{etde_6664179,
title = {Nitrogen levels and yeast viability during ethanol fermentation of grain sorghum containing condensed tannins}
author = {Mullins, J T, and NeSmith, C}
abstractNote = {Selected varieties of sorghum, Sorghum bicolor (L.) Moench, give high crop yields and they also return to favorable energy balance in terms of energy calories produced per cultural energy invested. The brown, condensed-tannin, bird- and mold-resistant varieties illustrate these advantages, but their nutritional value and ability to support the expected rate of ethanol fermentation is significantly lower than that of non-brown sorghums. It has been previously shown that the addition of nitrogen to brown sorghum mash supports a high rate of fermentative metabolism without removing the tannins, and suggested that the basis for the inhibition of ethanol fermentation was nitrogen starvation of the yeast cells. In this investigation, it is demonstrated that the addition of protease enzyme to mash results in an increase in amino nitrogen sufficient to support accelerated rates of ethanol fermentation by yeast cells. Thus, the hypothesis commonly cited in the literature that the presumed inhibitor, condensed tannins, function to reduce fermentative metabolism solely via the binding and precipitation of proteins is rejected.}
doi = {10.1016/0144-4565(88)90017-0}
journal = {Biomass; (United Kingdom)}
volume = {16:2}
journal type = {AC}
place = {United Kingdom}
year = {1988}
month = {Jan}
}