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Benesova K.,Vyzkumny ustav pivovarsky a sladarsky | Pluhackova H.,Mendel University in Brno | Belakova S.,Vyzkumny ustav pivovarsky a sladarsky | Vaculova K.,R.Ø.S.A. | And 3 more authors.
Chemicke Listy | Year: 2012

A new UPLC method for the determination of vitamin E in barley cereals is proposed. The method shows higher sensitivity and lower limits of detection and quantification than the previous HPLC methods. The method was applied to various spring barley varieties. Although it was not possible to separate all vitamin E isomers due to the reverse phase used, the rapid and inexpensive method is suitable for a long-term monitoring of vitamin E in barley and other cereals.

Horak T.,Vyzkumny ustav pivovarsky a sladarsky | Culik J.,Vyzkumny ustav pivovarsky a sladarsky | Jurkova M.,Vyzkumny ustav pivovarsky a sladarsky | Cejka P.,Vyzkumny ustav pivovarsky a sladarsky | And 3 more authors.
Chemicke Listy | Year: 2011

For the determination of beer flavours wellestablished methods require sample preparation by distillation, liquid-liquid extraction or headspace methods. In the past years, microextraction methods became popular. The stir bar sorption extraction (SBSE) is one of them. This article presents utilization of SBSE followed by solvent re-extraction in the determination of some esters and α-diketones in beer. The parameters (linearity, accuracy and repeatability) and also the determination of compounds of interest by SBSE are compared with steam distillation followed by liquid-liquid extraction, usually used for beer ester analysis, and the headspace technique used for α-diketones.

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