Kvasny Prumysl, 2010 (vol. 56), issue 10
Possibilities of utilization of modern sample preparation methods for gas chromatographic analysis of beverages and especially beer. Part II. - Stir Bar Sorptive Extraction.Peer-reviewed article
Tomáš HORÁK, Jiří ČULÍK, Marie JURKOVÁ, Pavel ČEJKA, Vladimír KELLNER, Josef DVOŘÁK, Danuša HAŠKOVÁ
Kvasny Prum. 2010; 56(10): 390-395 | DOI: 10.18832/kp2010040 
Stir bar sorptive extraction takes an important role in modern sample preparation procedures. This method is used mainly for the extraction of volatile and semi-volatile organic compounds from aqueous samples. This review is focused on overview of the important parameters to be evaluated in the optimization of SBSE extraction (extraction time, sample pH, ionic strength, effect of organic agents, temperature, agitation, derivatization, desorption conditions). Attention is also alerted to developments of new phases which are necessary for another expansion of SBSE technique. This work also reports a number of SBSE applications in beverage analysis especially...
Effect of tetrahydroiso-ɑ-acids on the growth of beer-spoiling and -nonspoiling bacteria.Peer-reviewed article
Dagmar MATOULKOVÁ, Karel SIGLER, Miroslav NĚMEC
Kvasny Prum. 2010; 56(10): 396-403 | DOI: 10.18832/kp2010041
We studied the effects of hop analogue compounds tetrahydroiso-α-acids (Tetra) on the growth and growth parameters of 23 Lactobacillus brevis strains isolated from several Czech lager breweries. Forcing test was used to divide the isolates into two groups, beerspoilage strains (10 isolates) and non-spoilers (13 isolates). The growth of L. brevis in MRS-broth containing varying concentrations of Tetra was investigated using Bioscreen C. The measured growth curves were used to calculate the basic growth parameters. All 23 isolates were able to grow in the presence of tetrahydroiso-α-acids, albeit to a varying extent. Tetra affected the growth...