Kvasny Prum. 1998; 44(7-8): 200-203 | DOI: 10.18832/kp1998013

Influence of Oxygen on Continuous Fermentation of Wort with Immobilized Yeast.Peer-reviewed article

Z. DÖMÉNY, D. ŠMOGROVIČOVÁ, E. ŠTURDÍK, P. GEMEINER, J. PÁTKOVÁ

In the work we investigated influence of the soluble oxygen concentration on the increase of free and bound biomass in fer-mentor with yeast immobilized in pectate gel during continuous fermentation of wort. Fermentation took place in "gas-lift" reactor and we worked at four different oxygen concentrations. We have found that at the oxygen concentration 2,4 and 6 mg/1 wort. the concentration of biomass has increased from originál value 50,4 g/1 gel up to 70,3 g/l, which corresponds to the saturated value of carrier with biomass. At the oxygen concentration 6 mg/1 the increase took place 10 days, at lower concentrations the increase was slower. Further we followed influence of oxygen on analytical criteria of beer as well. During aerobic fermentations the influence of oxygen on the concentration of total and free nitrogenous substances was positive. With increasing oxygen concentration, however, the diacetyl concentration and the concentration ratio of higher alcohols to esters was increasing as well.
(In Czech, English summary only)

Keywords: beer, fermentation, immobilized yeasts, ethanol, oxygen

Published: July 1, 1998