Kvasny Prumysl, 2014 (vol. 60), issue 1
Effect of temperature on the measurement of dissolved oxygen in the package.Peer-reviewed article
Jan ŠAVEL, Petr KOŠIN, Adam BROŽ
Kvasny Prum. 2014; 60(1): 2-7 | DOI: 10.18832/kp2014001 
The article deals with the measurement of dissolved oxygen in beverages using electronic probe and the influence of time and temperature changes on the result of measurement in a sample standing at a rest. The content of dissolved oxygen in the water depended on the temperature even with the constant concentration of dissolved oxygen in the sample, without any exchange of oxygen between gaseous and liquid phase. With the drop in water temperature the displayed DO increased while it decreased with increasing temperature. The difference of dissolved oxygen due to temperature changes was lower than it would correspond to the difference in solubility of...
Survey Results of Benzene Content in Soft Drinks.Peer-reviewed article
Adéla GRÉGROVÁ, Helena ČÍŽKOVÁ, Aleš RAJCHL, Jitka ŠNEBERGROVÁ, Michal VOLDŘICH
Kvasny Prum. 2014; 60(1): 8-14 | DOI: 10.18832/kp2014002
For almost 20 years, it has been known that if soft drinks are preserved with benzoic acid, it reacts under certain circumstances with ascorbic acid in drinks forming carcinogenic benzene. The concentrations of benzene in 49 soft drinks analysed within the five-year survey, obtained from the Czech market, were below 10 µg∙l-1; the average benzene content was about 1 µg∙l-1. The study showed that benzene content is not easily predictable: from the following factors of composition (benzoate, ascorbic acid, sweeteners, minerals, CO2) the only significant positive correlation was identified between benzene and the content of benzoate....