Katja Bizaj (Author), Mojca Škerget (Author), Iztok Jože Košir (Author), Željko Knez (Author)

Abstract

This study evaluates the content of essential oils (EOs) and prenylated flavonoid Xanthohumol (XN) in extracts of Slovenian hops, cultivar Aurora, obtained by using fluids of different polarity. It is a continuation of our previous work, investigating the extraction of bitter acids from hops. Extraction was conducted semi-continuously, using sub- and supercritical fluids of different polarity, i.e., carbon dioxide (CO2) and propane as non-polar and dimethyl ether (DME) as the polar solvent. The experiments explored a temperature range between 20 °C and 80 °C and pressures ranging from 50 bar to 150 bar. The content of XN in extracts was analysed using high-performance liquid chromatography and experiments demonstrated the largest concentration of XN was obtained using DME. In order to analyse the EO components in extracts, connected with a distinct odour, the steam distillation of extracts was performed and GC analysis was employed. Hop oil derived from CO2 extracts at specific conditions, had the highest relative concentration of linalool, β-caryophyllene and α-humulene, and oil derived from propane extracts had the highest content of all other five selected components (myrcene, geraniol, farnesene, α-selinene and δ-cadinene). The relative content of the investigated EO components in DME extracts was similar to that in propane extracts.

Keywords

hmelj;izvečki hmelja;ogljikov dioksid;hop extract;hop essential oils;flavonoids;carbon dioxide;propane;dimethyl ether;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 633.791
COBISS: 105861379 Link will open in a new window
ISSN: 2311-7524
Views: 18
Downloads: 1
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Other data

Secondary language: Slovenian
Secondary keywords: hmelj;izvečki hmelja;ogljikov dioksid;
Type (COBISS): Scientific work
Pages: 12 str.
Volume: ǂVol. ǂ8
Issue: ǂiss. ǂ5
Chronology: 2022
DOI: 10.3390/horticulturae8050368
ID: 19814353