Kvasny Prumysl, 1986 (vol. 32), issue 10
Results of works of Research Institute of Brewing and malting in Prague.Peer-reviewed article
J. CUŘÍN
Kvasny Prum. 1986; 32(10): 225-227 | DOI: 10.18832/kp1986063 
The chief attention in the brewing-malting research is devoted to the needs of export, tests of new varieties of brewing barley, the better utilization of bitter substances from hop during brewing using kieselgur, the rationalization of beer production, the better utilization of brewing wastes and the research of beer stabilization using the stabilization filter. Principle prospect tasks are connected with problems of barley without antocyanogens and with the research of an application of immobilized yeasts.(In Czech, English summary only)
Light beer. I. Present situation in the world.Peer-reviewed article
M. ČERNÝ, V. ČERNOHORSKÝ, J. ©TICHAUER
Kvasny Prum. 1986; 32(10): 227-231 | DOI: 10.18832/kp1986064
Authors discuss knowledge about the new type of beer with a lowered utilizable energy that is called "light beer". This term is quite usual in the foreign literature. The light beers are mainly spread in theU.S.A.where their production is 15 to 20 % from the whole production. InEuropethis type of beer has not been so spread since its sensoric properties are more or less different from the usual types of beer. From the gathering of information the authors try to define this type of beer despite of no correct definition of the term "light beer" exists in the foreign literature yet. The reasons for a sale of light beer are described. These beers are divided...
Utilization of immobilized yeasts for production of sparkling wine.Peer-reviewed article
B. PARDONOVÁ, M. POLEDNÍKOVÁ, H. ©EDOVÁ, M. KAHLER
Kvasny Prum. 1986; 32(10): 232-235 | DOI: 10.18832/kp1986065
The quantity of some volatile compounds and free amino acids in sparkling wines produced in the batch procedure using free and immobilized yeast cells were tested in production-scale experiments. The lowered absorption of free amino acids by immobilized yeast population as well as their limited growth resulted in concentration changes of volatile compounds. The wines contained less higher alcohols, esters, fatty acids and carbonyl compounds but the quantity of free amino acids was about by 9 % higher. These changes had a positive effect on taste properties of the final experimental wines. The morphology of immobilized cells was changed during several...
Effect of some lipid or steroid compounds on synthesis of ergosterol with the yeast Saccharomyces cerevisiae.Peer-reviewed article
J. PÁSKOVÁ, B. ©PAČEK, J. LIST
Kvasny Prum. 1986; 32(10): 236-239 | DOI: 10.18832/kp1986066
The theoretical yield of ergosterol was increased by 40 % when the growth medium was enriched by 0,5 % of lard. A significant increase of the ergosterol biosynthesis was achieved by the addition of sunflower seed, soybeen, or rape seed oil. From the individual fatty acids the positive effect had an addition of 0,1 % of linolenic, linoleic or oleic acids. The addition of palmitic and stearic acids resulted in the worse ratio of ergosterol in the mixture of Δ 5,7 sterols. Lauric acid inhibited the synthesis of Δ 5,7 sterols but also strongly decreased the formation 24/28 dehydroergosterol, so the fraction of ergosterol in the mixture Δ...
Contribution to enzymatic determination of vitamin C in non-alcoholic beverages.Peer-reviewed article
Z. ZLOCH
Kvasny Prum. 1986; 32(10): 239-241 | DOI: 10.18832/kp1986067
A brief description of the ascorbat peroxidase preparation and the optimum conditions for its application for specific and quantitative oxidation of ascorbic acid in extracts of various non-alcoholic beverages is made in the article. This oxidation is connection with usual methods of the vitamin C determination results in the simplicity of this analysis while its specifity is increased. Some analytical procedures were tested. A comparison of these results with those obtained by the Boehringer (Mannheim) test two different modification for the vitamin C determination in beverages are recommended: the reduction of ferric salt in the original and in the...
Pilot scale production of cellulase.Peer-reviewed article
V. FARKA©, M. LI©KOVÁ, M. GRO©ÍK, I. SOLDÁNOVÁ, G. KERNS
Kvasny Prum. 1986; 32(10): 241-243 | DOI: 10.18832/kp1986068
A 150 literfermentor from Elektrolux (Sweden) was used to test the production of cellulases from Trichoderma reesei in fed-batch regime using the stepwise additions of carbon source. As substrates, lactose and microcrystalline cellulose were compared. The obtained levels of cellulose activities (FPA) were around 85 nkat.ml-1 (5 IU.ml-1) after 140 h cultivation with both substrates used, however the increase of cellulose activity with microcrystalline cellulose was faster as that with lactose.(In Slovak, English summary only)