Kvasny Prumysl, 1973 (vol. 19), issue 11
Time saving method for the determination of hop resins.Peer-reviewed article
J. MO©TEK, L. MOJDL, J. ČEPIČKA, V. PETRAS
Kvasny Prum. 1973; 19(11): 241-245 | DOI: 10.18832/kp1973021 
The authors have developed a new time saving method for the determination of five principal fractions of hop resins in hops, dry hop preparations hop extract and residue left after evaporation of miscella in the hop extract manufacturing process. The principle of the method is based on mixing extraction by means of cold methanol, gravimetric determination of total amount of resins and separately of soft resins and finally spectrophotometric determination of bitter hop resins. The method has many advantages: it is convenieat and simple, requires little time, is safe gives reliable results and requires easily available laboratory equipment. One analysis...
Concentration and losses of ethanol taking place in aeration processes.Peer-reviewed article
K. KADLEC, V. LABÍK
Kvasny Prum. 1973; 19(11): 247-252 | DOI: 10.18832/kp1973022
The authors calculate theoretic concentration of ethanol in a gaseous phase relating it to the ethanol percentage in a liquid phase. The study covers systems in which water solution of ethanol is intensively aerated and equilibrium exists between components, i.e. ethanol-water-air. Ethanol concentration in gaseous phase is calculated for wide range of its concentration in water, i.e. from 0,1 to 25%. The results are related to various states of the solution as well as to the intensity of aeration, i.e. the air flow rate through the fermenter. Application of the derived formulae is show in a number of examples.(In Czech, English summary only)
Producing of active dry yeast by drying on fluidized-bed. 1. The ways of acive dry yeast producing.Peer-reviewed article
M. ©ESTÁKOVÁ
Kvasny Prum. 1973; 19(11): 252-257 | DOI: 10.18832/kp1973023
The authoress assesses both advantages and disadvantages of various methods used for making active dry yeast in fluidized-bed dries. Quantities characterizing technologic parameters and economic indices of all current single-stage, two-stage and combined processes are tabulated. Yields obtainable by individual methods and quality of product are analyzed. The so - called vibrofluid drying methods, which are used in industry on a large scale, ensure excellent quality of dry yeast and eliminate the need of any protective additives. The pure fluidized-bed methods, though requiring only simple installations and consequently low capital investments, are...