Kvasny Prumysl, 1996 (vol. 42), issue 7-8
Bitter substances and essential oils analyses of hop hybrid new selections.Peer-reviewed article
K. KROFTA, A. RÍGR, F. KROUPA, F. BERÁNEK
Kvasny Prum. 1996; 42(7-8): 237-340 | DOI: 10.18832/kp1996016 
The article summarizes the results of selection tests performed by the Hop Institute Co. Ltd., ®atec in 1995 with accent to key analytical parameters of cultivated hybrid seedlings. Attempt has been made to attain a higher α-acid content as well as of further important substances. Assessment of the yields has been at the same time made, wich is important from the economical viewpoint. From the analytical results followed good prospects of hop hybridization experiments, which were enabled by new legislative, unlike to date performed done selections, their possibilities being nowadays considerably limited.(In Czech, English summary only)
Ethanol determination in beer with biosensor.Peer-reviewed article
J. ©VITEL, O. ČURILLA
Kvasny Prum. 1996; 42(7-8): 241-242 | DOI: 10.18832/kp1996017
The ethanol biosensor was based on a polarographic oxygen electrode covered with cells Gluconobacter oxydans immobilised in gelatine. The working range of sensor was 0-0.003 % (vol.), determination of one sample takes 5 minutes. The biosensor undergoes succesive inactivation. Two days after preparation biosensor is suitable for accurate measurement. The results of ethanol measurements with biosensor are in agreement with ethanol determination with gas chromatograph.(In Slovak, English summary only)
Assessment of artificial sweeteners in beer.Peer-reviewed article
D. ČADKOVÁ, J. ČULÍK, M. JURKOVÁ
Kvasny Prum. 1996; 42(7-8): 243-244 | DOI: 10.18832/kp1996018
In industrially developed countries new trends are coming up to the foreground aimed at beverage energy content decrease, making thus them suitable even for diabetics. On the Czech market can be most frequently met beverages sweetened by Saccharine, Aspartame or Acesulfame K. The separation and assessment of the three mentioned sweeteners from beer and its mixtures with syrups is described. For the purpose of sweetener isolation, a series-connected Bond Elut SAX and Separon SGX sorbents with separated extraction o the individual sweeteners have been used. Eluates underwent HPLC analysis with UV detection using a graduent elution. The method was applied...
The assessment of polyaromatic hydrocarbons in beer.Peer-reviewed article
M. JURKOVÁ, D. ČADKOVÁ, J. ČULÍK
Kvasny Prum. 1996; 42(7-8): 245-246 | DOI: 10.18832/kp1996019
Some polycyclic aromatic hydrocarbons contained in beer underwent analysis by using liquid chromatography with fluorescent detection. The monitored hydrocarbons were isolated from beer by means of membrane extraction discs 3M Empore C18, dissolved in methanol with following separation on analytical column Nuc1eo-sil 5-PAH (Macherey-Nagel) using gradient elution with mobile acetonitril-water phase. From the preliminary results followed that the total content of polycyclic aromatic hydrocarbons in beer is likely to be found on levels below 1 mg/l, thus being lower than a proposed hygienic limit for comestibles.(In Czech, English summary only)