Kvasny Prumysl, 1982 (vol. 28), issue 6
A Significance of barley properties in technology and malt quality.Peer-reviewed article
A. DOLEŽALOVÁ
Kvasny Prum. 1982; 28(6): 121-124 | DOI: 10.18832/kp1982024 
Increasing demands on criteria of malt quality recall also demands on a higher quality of barley. Quick and objective checks for the estimation of barley quality are searched. One of the chief factors influencing the choice of the method is a time of the determination since during a purchasing no time-delay can occur. The main parameters affecting the quality of brewing barley are its variety, origin and a technique of its culture. Needless to say, all these parameters cannot be a sufficient guarantee of a good quality but are very important in a choice of brewing barleys. The table shows analytic criteria of barley including the relations between...
Check brewing.Peer-reviewed article
V. ČERNOHORSKÝ, J. CUŘÍN
Kvasny Prum. 1982; 28(6): 125-128 | DOI: 10.18832/kp1982025
On a base of a long-time practical experiences the authors discuss a method of check brewings. The principal procedure and the treatment of check brewings including methods of a performance, a sampling procedure and the evaluation of results are described.(In Czech, English summary only)
Formation of nitrites in contaminated yeast inoculum.Peer-reviewed article
J. ŠAVEL, M. PROKOPOVÁ
Kvasny Prum. 1982; 28(6): 128-131 | DOI: 10.18832/kp1982026
The formation of nitrites in contaminated yeast inoculum keeping under water was observed. The rate of the nitrite formation was dependent on a quantity of bacteria, temperature and a concentration of nitrates in water. In presence of yeasts, nitrites were degraded. A simple test for detection of bacteria reducing N03 in a yeast inoculum is described. The principles for an achievement of the lowest level of nitrites in a yeast inoculum are given.(In Czech, English summary only)
Production of phenylacetylcarbinol and ephedrine - less known region of yeast utilization in industry.Peer-reviewed article
J. NETRVAL, M. VODŇANSKÝ
Kvasny Prum. 1982; 28(6): 131-134 | DOI: 10.18832/kp1982027
Phenylacetylcarbinol (PAC) is a base material for ephedrine production. Ephedrine is a constituent of many pharmaceutical preparations. For the PAC production waste brewer's yeast are used. The yeast suspension is supplied stepwise by benzaldehyde, sucrose and acetaldehyde where the last compound serves as a hydrogen acceptor, as long as the biotransformation is stopped due to the inhibition of the enzyme system. PAC formed is then extracted into the organic solvent. After its thickening the reduction in presence of methylamine and a special catalyst on a base of platinum under low hydrogen pressure is performed. The aim of experiments made was to...
A contribution to the study of Mg-bisulphite liquor fermentation in the CHEPOS - fermentor.Peer-reviewed article
P. SEICHTER, L. PEŠL, J. KVASNIČKA, V. SLÁMA
Kvasny Prum. 1982; 28(6): 134-139 | DOI: 10.18832/kp1982028
The paper brings the results of the continuous Mg-bisulphite fermentation tests with Candida Utilis in CHEPOS laboratory fermentor. The experiment carried out in this fermentor proved good hydrodynamical conditions and sufficient oxygen transfer for the dilution rate up to 0,324 h-1, and specific production up to 5,2 kg. m-3. h-1. The results of continuous collection of all the measured data indicated that the specific oxygen consumption (SSO) could be considerably lower than it was generally assumed, especially with high yeast concentration. The mixing and aeration parameters changes during fermentation enabled to...