Kvasny Prumysl, 2009 (vol. 55), issue 11-12
Faster gas chromatography and its utilization in brewing. Part 3. - The determination of some low volatile beer flavours.Peer-reviewed article
Tomáš HORÁK, Jiří ČULÍK, Marie JURKOVÁ, Pavel ČEJKA, Vladimír KELLNER, Josef DVOŘÁK, Danuša HAŠKOVÁ
Kvasny Prum. 2009; 55(11-12): 304-309 | DOI: 10.18832/kp2009024 
Shortening of gas chromatography run time without losing of separation efficiency is available by using of silica capillary columns with new size of internal diameter - 0.18 mm. This work is focussed on application of these narrow bore columns and their comparisons with usually applied columns with 0.32 mm of internal diameter for the determination of some beer flavours as fatty acids (isobutyric, butyric, isovaleric, valeric, caproic, caprylic, pelargonic, capric, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic acids) and some higher alcohols. These compounds were extracted from beer matrix by solid phase extraction methods or by steam...
Determination of methionine in malt.Peer-reviewed article
Renata MIKULÍKOVÁ, Zdeněk SVOBODA, Karolína BENEŠOVÁ, Sylvie BĚLÁKOVÁ
Kvasny Prum. 2009; 55(11-12): 310-314 | DOI: 10.18832/kp2009025
Volatile sulphur substances play an important role in sensory beer quality. Their precursors are sulphur amino acids, first of all sulphur amino acid metionine. Content of methionine was studied in malts made from six barley varieties (Bojos, Jersey, Malz, Prestige, Tolar, and Xanadu) from two localities (Branišovice, Hrubčice). In addition, methionine content in dependence on temperature of kilning (roasting) was monitored. The technique for the determination of methionine in malt was optimized using the gas chromatography with a selective flame photometric detector. At the validation of this method, the following parameters were achieved: LOQ 1.6,...
Determination of lipid content and fatty acid representation in barley caryopses and malt.Peer-reviewed article
Zdeněk SVOBODA, Renata MIKULÍKOVÁ, Sylvie BĚLÁKOVÁ, Karolína BENEŠOVÁ, Zdeněk NESVADBA
Kvasny Prum. 2009; 55(11-12): 315-320 | DOI: 10.18832/kp2009026
The modern method of extraction on the fluidized bed was optimized for the determination of lipids in barley caryopses and malt. Representation of fatty acids in barley caryopsis and malt was determined from extracted lipids. The represented fatty acids were determined as methyl esters prepared with transesterification reaction. The esters formed were separated using the method of gas chromatography with flame ionization detection on the capillary column SLB-IL 100.The modern method of extraction on the fluidized bed was optimized for the determination of lipids in barley caryopses and malt. Representation of fatty acids in barley caryopsis and malt...
Quality of barley grain from the testing sites of the Czech Republic, harvest 2008.Peer-reviewed article
Lenka SACHAMBULA, Vratislav PSOTA, Olga DVOŘÁČKOVÁ
Kvasny Prum. 2009; 55(11-12): 320-325 | DOI: 10.18832/kp2009027
Samples of three varieties of spring barley from 24 testing stations and two winter barley varieties from 13 testing stations were analyzed according to the standard ČSN 461100-5. The favorable course of weather in 2008 positively affected content of nitrogenous substances (11.9% and 11.4%) and starch (64.4% and 63.6%) in spring and winter barley caryopses. The occurrence of sprouted grains was minimal and the amount of the damaged grains was lower. Grain harvested in 2008 was bigger and its size was more homogenous. Portion of sieving fractions above 2.5 mm was on average 88.3 % in spring barley and 87.8% in winter barley. 2008 was a favorable year...
Barley varieties registered in the Slovak Republic in 2009.Peer-reviewed article
Vratislav PSOTA, Lenka SACHAMBULA, Marián SVORAD
Kvasny Prum. 2009; 55(11-12): 326-330 | DOI: 10.18832/kp2009028
In 2009 six malting varieties of spring barley were registered in the Slovak Republic. All the studied varieties had the optimal level of proteolytic, amylolytic and cytolytic modification. The variety Donaris had extract on the level of 82.7% and wort composition on the level of 82.8 %. Eskobar had high extract content (83.0%) and apparent final attenuation achieved values of 82.6%. Extract of the variety Kangoo was on the level of 82.1% and apparent final attenuation was high (83.7%). Signora provided high extract content (83.8%) and wort composition was optimal (83.2%). Sladar provided high extract content (83.4%) and wort composition was favorable...