Kvasny Prumysl, 2003 (vol. 49), issue 7-8
Alpha-Acetolactate Degradation by Immobilized alpha-Acetolactate Decarboxylase.Peer-reviewed article
Daniela ©MOGROVIČOVÁ, Zoltán DÖMÉNY
Kvasny Prum. 2003; 49(7-8): 182-185 | DOI: 10.18832/kp2003012 
We were veryfying α-acetolactate degradation efficiency as a diacetyl percursor with α-acetolactate decarboxylase, which was immobilized in various ways into calcium alginate, because of its possible reuse in the subsequent fermentations. During the first fermentation the way of enzyme agent's immobilization didn't influence its stability, diacetyl concentration in hopped wort was null. During the same immobilizate reuse the concentration of diacetyl was moving in the range from 0 to 0,11 mg/l in the second cycle and in the range from 0,04 to 0,16 mg/l in the third cycle depending on the way of enzyme agent`s immobilization. Enzyme was the...
A Negative Influence of the Air as a Tapping Gas on Draught Beer Quality.Peer-reviewed article
Josef KRÝSL, Jiří FAMĚRA
Kvasny Prum. 2003; 49(7-8): 185-187 | DOI: 10.18832/kp2003013
The authors evaluate the influence of the air use on beer quality during its tapping.The database of ca 18 000 taprooms includes tapping parametres' figures. Their assessment leads to reducing the air use during its tapping. The air in comparison with other working gases almost double the level of contamination in draught beer.The assessment of quality of the used air was taken in the next part. The biggest danger is contamination with oil substances. Economic comparison of the working gas use leads to the conclusion, that the use of CO2 or the mixture of CO2 and N2 increase the production costs of ca 0,15 to 0,17 CZK/0,5 l of beer.The authors evaluate...
Turbidimetric Titration Analyses of Classical Kieselguhr Filtration.Peer-reviewed article
Petr SLADKÝ, Miroslav DIENSTBIER
Kvasny Prum. 2003; 49(7-8): 188-191 | DOI: 10.18832/kp2003014
Turbidity of pale beer was measured in two angles of scattered light during the conventional kieselguhr filtration and further analysed using developed rapid turbidimetric titration methods. Although the turbidity of the filtrate decreased during the filtration process, the colloidal instability of the filtrate markedly increased as it was revealed by alcohol chill haze test and confirmed by thermal forcing method. Turbidimetric PVP titration of the filtrated beer indicated growth of the Chapon`s tannoids with the filtration time. Also an increase of anthocyanogenes and total polyphenols, measured for the control as a function of time of the filtration,...
Basic Principles of Malting Barley Breeding (part 2).Peer-reviewed article
Ivan LANGER
Kvasny Prum. 2003; 49(7-8): 191-199 | DOI: 10.18832/kp2003015
The article sums up current knowledge of malting barley breeding work. The first part is, except of the brief description of barley Hordeum vulgare ssp. vulgare, its genetics and chromosomal map, focused on the process of selection work. Historical and currently used conventional methods are described (pedigree, population, combined population- pedigree, and early testing method) with their advantages and negative sides. The second part of the article first deals with the selection strategy for individual characters (yield, agricultural qualities, disease resistance, malting quality). Each feature is briefly described and an appropriate method of selection...