Kvasny Prum. 1999; 45(5): 120-123 | DOI: 10.18832/kp1999009

Using of immobilised yeast during fermentation of high gravity worts.Peer-reviewed article

Z. DÖMÉNY, D. ŠMOGROVIČOVÁ, E. ŠTUDLÍK, J. PÁTKOVÁ, P. BAFRNCOVÁ

In the work have been tested a filling column and a "gas-lift" reactor for fermentation of high gravity wort with yeast immobilised in calcium pectate. Four different concentration of original wort extract - 12, 16, 20 and 24% have been tested. The consumption rate of substrate during fermentation of 12% wort in a "gas-lift" reactor was higher (5,76 g/l.h) than in a filling column (4,4 g/l.h). In correspondence with increasing concentration of original extract, the consumption rate of substrate was decreasing. In case of 24% wort in a "gas-lift" reactor to 96% and a storey column to 81% from the value determined at 12% extract. The ratio of higher alcohols to esters has changed in case of a "gas-lift" reactor from 4,63 : 1 to 4,12 : 1, in case of a storey column from 4,4 : 1 to 3,32 : 1. There have been found changes in utilisation of amino acids as well.In the work have been tested a filling column and a "gas-lift" reactor for fermentation of high gravity wort with yeast immobilised in calcium pectate. Four different concentration of original wort extract - 12, 16, 20 and 24% have been tested. The consumption rate of substrate during fermentation of 12% wort in a "gas-lift" reactor was higher (5,76 g/l.h) than in a filling column (4,4 g/l.h). In correspondence with increasing concentration of original extract, the consumption rate of substrate was decreasing. In case of 24% wort in a "gas-lift" reactor to 96% and a storey column to 81% from the value determined at 12% extract. The ratio of higher alcohols to esters has changed in case of a "gas-lift" reactor from 4,63 : 1 to 4,12 : 1, in case of a storey column from 4,4 : 1 to 3,32 : 1. There have been found changes in utilisation of amino acids as well.

Keywords: beer, fermentation, mashed wort, immoblized yeasts, fermentation reactor

Published: May 1, 1999