Kvasny Prumysl, 2012 (vol. 58), issue 3
Factors affecting gushing.Peer-reviewed article
Sylvie BĚLÁKOVÁ, Karolína BENEŠOVÁ, Renata MIKULÍKOVÁ, Zdeněk SVOBODA
Kvasny Prum. 2012; 58(3): 62-65 | DOI: 10.18832/kp2012007 
Prediction of gushing in 15 grain samples of spring barley and gushing in malt were determined. Deoxynivalenol content, ergosterol concentration, activity of 1,3-β-glucanase and chitinase and oxalate content were measured in these samples. Zero gushing potential was found in all barley samples. Gushing in malt varied from 4-39 ml. Deoxynivalenol concentration was at a very low level in all studied samples. Activity of stress-induced proteins was higher in malts from the locality Domanínek. Oxalate content presumably did not affect gushing formation in malt.Prediction of gushing in 15 grain samples of spring barley and gushing in malt were determined....
The evaluation of α- and β-acid contents of Czech and Moravian hops from the 2011 harvest.Peer-reviewed article
Alexandr MIKYŠKA, Marie JURKOVÁ
Kvasny Prum. 2012; 58(3): 66-72 | DOI: 10.18832/kp2012008
The contents of α- and β- acids from hops harvested in the Czech Republic in 2011 have been evaluated. The sampling was done in all three growing areas - Žatec (75.9 % of the hop yard areas in the Czech Republic), Úštěk (13.3 %) and Tršice (12.6 %). The Saaz variety (ŽPČ) was cultivated on 87,4 % of the harvest areas, the Sladek variety on 5.4 %, Premiant variety on 5.5 % and the Agnus variety on 1.1 % of the harvest areas. The hops were analyzed in accordance with the Analytica-EBC, method 7.7 (HPLC) and all results are given in weight % in dry matter. The average value for α-acids in the Saaz variety in the Czech Republic was 4.2 %...
The influence of reducing substances on the oxygen consumption in model solutions.Peer-reviewed article
Jan ŠAVEL, Petr KOŠIN, Adam BROŽ
Kvasny Prum. 2012; 58(3): 73-81 | DOI: 10.18832/kp2012009
The consumption of oxygen in the solution of sodium sulfite, sodium disulfite, and ascorbic acid in deionized and brewing water was measured. The rate of consumption depended on the pH and buffer capacity of water, the presence of copper, iron or cobalt ions, and on the addition of model oxidizing agents such as potassium dichromate and hydrogen peroxide. Ethanol and maltose reduced the rate of oxygen consumption in sulfite solutions, but increased in the solution of ascorbic acid. Hydrogen peroxide accelerated the conversion of ascorbic acid into yellow and brown pigments, which was followed by their degradation.The consumption of oxygen in the solution...