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Selective extraction of bitter acids and volatile compounds from hops (Humulus lupulus L.) using sub- and
Bruno Fischer1, Paulo Amaurí Lando Júnior1, Júlia Kurek Carvalho Brum1
1Department of Food and Chemical Engineering, URI Erechim, Av. Sete de Setembro 1621, Erechim, RS 99709-910, Brazil.
None:
This study investigates the extraction of bioactive compounds from Polaris variety hops using pressurized fluid systems with carbon dioxide (CO2) and 1,1,1,2-tetrafluoroethane (R134a) as solvents. The effect of hop particle size on extraction yield was evaluated under subcritical CO2 conditions (100 bar, 10 °C), with kinetic modeling via the Weibull equation. Optimal yields were observed with particles between 500 and 1000 μm. R134a extraction employed a central composite design to examine temperature and pressure effects, with temperature showing a significant influence on yield. Chemical characterization included volatile organic compounds (VOCs), bitter acids (α- and β-acids), and total phenolic content. Subcritical CO2 favored selective extraction of α-acids and monoterpenes, while supercritical conditions enhanced the solubility of less volatile compounds. R134a demonstrated selectivity for moderately polar compounds, such as esters and alcohols, with temperature-dependent efficiency.
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