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Title: Effect of pressure and temperature on alcoholic fermentation by Saccharomyces cerevisiae immobilized on gamma-alumina pellets
Authors: Galanakis, Charis M.
Kordulis, Christos
Kanellaki, Maria
Koutinas, Athanasios A.
Bekatorou, Argyro
Lycourghiotis, Alexis
Keywords: ethanol-production;calcium-alginate;wine-making;cells;yeast;biocatalyst;bioreactor;products;support;batch
Category: Other Agricultural Sciences
Field: Agricultural Sciences
Issue Date: 2012
Source: BIORESOURCE TECHNOLOGY Volume: 114 Issue: Pages:492-498
Abstract: Saccharomyces cerevisiae was immobilized on gamma-alumina pellets and used for repeated batch fermentations in glucose medium (16.5 g/100 mL) at various temperatures and pressures. An increase in pressure from 3 to 7 atm and a decrease in temperature from 30 to 20 degrees C reduced the ethanol productivity by about 50% and 70%, respectively. Increasing concentrations of volatile by-products were observed at lower fermentation temperatures, while the pressure influence on the concentrations of these by-products was proved to be more complex. Mathematical expressions were established to allow the calculation of the fermentation rate at various pressures and sugar concentrations when the corresponding rate at atmospheric pressure is known. The study showed that the height of bioreactors has to be limited to 19.5 m due to hydrostatic pressure shock at higher fill levels. (C) 2012 Elsevier Ltd. All rights reserved.
Rights: Copyright © 2012 Elsevier Ltd. All rights reserved.
Type: Article
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