Kvasny Prumysl, 1992 (vol. 38), issue 5
Czech hop varieties and their biochemical characteristics determined by HPLC.Peer-reviewed article
F. KROUPA
Kvasny Prum. 1992; 38(5): 129-132 | DOI: 10.18832/kp1992015 
Analyses of the individul analogs of α- and β- bitter acids from all the 12 allowed Czech hop varieties were performed during 1987, 1988, 1990 and 1991. Each variety has been characterized by the level of cohumulone, colupulone and by the ratio of α- and β- bitter acids. It was proved that the varieties with the same genetic basis, obtained by cloning, cannot be distinguished. The varieties VUCH 70 and VUCH 71 obtained by crossing can distinguish quite well. The variety identification cannot be made on a base of one parameter only. It follows from the fact that some variability in levels of the bitter acid analogs results from...
Modelling of beer fermentation in conical fermenting vessels.Peer-reviewed article
P. VOLF, J. VOTRUBA, G. BASAŘOVÁ
Kvasny Prum. 1992; 38(5): 132-135 | DOI: 10.18832/kp1992016
The polynomial equations of the third and fourth order were applied for the description of the fermentation process. The concentration of reduced substances served as a variable parameter of the process. A phenomenological model for the balances of saccharidic compounds and diacetyl as well as for the decrease of apparent extract during time as a function of temperature and pressure was used. The parameters of the model were identified. Further, the model was extended for the CO2 balance. The developed kinetic model permits to optimize the temperature and pressure regime of the fermentation and ripening and it can be used as a part of the...
Nystatin biosynthesis on nontraditiona1 carbon substrates. I. Hydrolyzates of starch wastes.Peer-reviewed article
I. BEDNÁŘOVÁ, J. PELECHOVÁ, F. SMÉKAL, F. DAVID, J. HLOUŠEK, V. POJEZDNÝ
Kvasny Prum. 1992; 38(5): 136-140 | DOI: 10.18832/kp1992017
The nystatin biosynthesis with the strain Streptomyces noursei using hydrolyzates of some starch raw materials or wastes from the production of maize and wheat has been studied on a laboratory scale in shake flasks. The results were compared with those obtained with glucose as a carbon and energy source. The comparison proved that despite of a lower nystatin yield observed with those nontraditional carbon substrates this procedure could be preferred from the economical standpoint (price relation between the hydrolyzate of maize starch and glucose).(In Czech, English summary only)