Kvasny Prumysl, 2000 (vol. 46), issue 9
Determination of hop oils using the solid-phase microextraction method (SPME).Peer-reviewed article
K. KROFTA, J. ČEPIČKA
Kvasny Prum. 2000; 46(9): 235-241 | DOI: 10.18832/kp2000019 
The method of solid-phase microextraction in the "headspace" execution (HS-SPME) was used for the insulation of hop oils from the hop cones of female plants and from the inflorescences of male plants. Several SPME fibres with different polarity of the active layer (PDMS 100 mm and 30 mm, PDMS/DVB 65 mm, PA 85 mm) were tested under various experimental conditions (temperature, exposure time, samples weighed-out). The sorption of the analyses has been vigorously influenced by the temperature and the exposure time, while the sample weighed-out in the range of 0,1 to 0,3 g has not basically influenced the sorption of the individual oil components. From...
Application of cryoscopy in brewing and malting.Peer-reviewed article
J. ©AVEL
Kvasny Prum. 2000; 46(9): 241-243 | DOI: 10.18832/kp2000020
The article deals with the application of cryoscopy in brewing for determination of the available degree of attenuation and for the analysis of beer. The work indicates relations setting the linear dependence of so called reduced wort osmolatity on the share of the unfermentable real extract and of the original wort extract. The reduced wort osmolality is got by multiplication of osmolality by the expression (100-p)/p, where "p" is the wort extract. The reduced osmolatity is a proper quality indicator for wort and malt. The cryoscopy could be used as well for a quick analysis of beer taking some 4 minutes where the sample consumption goes upto 20 ml...
Classification of selected Slovak variety wines.Peer-reviewed article
J. PE«KA, B. BALLA, P. FARKA©, J. MOCÁK, M. KOVÁČ
Kvasny Prum. 2000; 46(9): 244-247 | DOI: 10.18832/kp2000021
During a three years period, the content of the selected volatile substances has been detected in the Slovak varietal wines, Welschriesling, Grüner Veltliner and Müller Thurgau. The acquired data were achieved by means of different multivariation methods for the purpose of finding a combination of volatile substances that would enable a classification of the tested variety wines. A proper classification and finding of authentic Slovak variety wines was possible due to the lineal and quadratic discriminant analysis.During a three years period, the content of the selected volatile substances has been detected in the Slovak varietal wines, Welschriesling,...