Abstract
Fermentation efficiency of more than 85% was obtained by high gravity fermentation of 33-34°Bx (spec. gravity ≈1.134) molasses medium with certain nutrients, instead of generally employed medium containing ≈16% (w/v) total sugar (spec. gravity ≈1.090) for ethanol fermentation in distilleries to get maximum 80-85% conversion. The fermenting yeast, Saccharomyces, has varied capabilities, depending on the species and nutrition for fermenting the high solids medium. The fermentation period was reduced to 48 h; and the byproducts obtained were less in concentration, upon supplementation with nutrients (or osmoprotectants) like soy flour/wheat bran to the medium in the existing batch fermentation technology. This has been found partly due to improved yeast cell viability during fermentation.
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