Faster gas chromatography and its utilization in brewing. Part 3. - The determination of some volatile beer flavours
2009
Horak, T.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Culik, J.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Jurkova, M.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Cejka, P.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Kellner, V.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Dvorak, J.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav | Haskova, D.,Vyzkumny Ustav Pivovarsky a Sladarsky, Prague (Czech Republic). Pivovarsky Ustav
This study was focused on narrow bore columns (0.18 mm of internal diameter) used in gas chromatography to determine some beer flavour compounds such as fatty acids (isobutyric, butyric, isovaleric, valeric, caproic, caprylic, pelargonic, capric, lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic acids) and some higher alcohols. The narrow columns were compared with usually applied columns with 0.32 mm of internal diameter. Volatile compounds were extracted from beer matrix by solid phase extraction methods or by steam distillation followed by liquid-liquid extraction procedures. A flame ionization detector was used to detect the analytes. The fused silica capillary columns could be successfully used to determine fatty acids and higher alcohols in beers. In comparison with usually applied columns, the run time of the new columns was reduced by about 50% when determining fatty acids, and by 60% when determining higher alcohols.
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