Kvasny Prumysl, 1976 (vol. 22), issue 6
Effects of harvesting time upon the quality of malting barley.Peer-reviewed article
Z. VOŇKA
Kvasny Prum. 1976; 22(6): 125-128 | DOI: 10.18832/kp1976019 
The results of comprehensive field tests show, that the optimum moment for harvesting malting barley with harvesters-threshers is the stage of its full ripeness. Under such conditions harvesting losses are minimum and quality of grain is very good. Premature harvesting reduces germinating viability and extends the dormancy period. Late harvest is undesirable, since overripe barley is very sensitive to weather fluctuations, which may sometimes contribute to longer dormancy. It is not economical to increase the share of large size grains, because of increased harvesting losses. Samples of ears taken some 10 day before their full ripeness permit to determine...
Application of gas chromatography for the determination of methanol and fusel oil contents in the products of fermentation processes.Peer-reviewed article
D. ARBETOVÁ, J. HRIVŇÁK
Kvasny Prum. 1976; 22(6): 128-129 | DOI: 10.18832/kp1976020
Gas chromatography has been successfully applied to determine the contents of methanol and fusel oil in the products of fermentation industry. A 2 mlong column with 2 mminner diameter was filled with 10 % polyethylenglykol 400 on Chromosorbe W with grain size ranging from 0.20 mm to 0.25 mm. Analyses were carried out at 60°C and pressure of carrier gas (nitrogen)7,85 Pa (= 0,8kp/cm2 ). The figure indicates the pressure at the intake end of the column. A flame ionization detector was used to identify individual components. The results show, that in a number of products the percentage of methanol was slightly above the limits allowed by the...
Continuous propagation of yeast.Peer-reviewed article
M. KAHLER, R. VOLDŘICH
Kvasny Prum. 1976; 22(6): 135-139 | DOI: 10.18832/kp1976021
The article deals with the principal parameters of a single step installation for continuous propagation of yeast. Under anaerobic conditions the yeast has only one source of energy, viz. alcohol glycolysis and, consequently, the propagation intensity depends on the amount of fermented sugar. Feeding medium must therefore contain sufficient percentage of sugar the concentration of which should be kept within the 80-85 g/l limits. Lower concentrations reduce the growth rate. Air must be fed into the propagator in quantities required to stimulate essential sterols. There is no danger of medium aeration, since all incoming oxygen is immediately assimilated...