Title: A kinetic study on the isomerization of hop alpha-acids
Authors: Jaskula-Goiris, Barbara ×
Kafarski, Pawel
Aerts, Guido
De Cooman, Luc #
Issue Date: 2008
Publisher: American Chemical Society, Books and Journals Division
Series Title: Journal of Agricultural and Food Chemistry vol:56 issue:15 pages:6408-6415
Abstract: In this article, a detailed study on hop alpha-acid isomerization kinetics is presented. Because of the complex wort matrix and interfering interactions occurring during real wort boiling (i.e., trub formation and alpha-acids/iso-alpha-acids complexation), this investigation on alpha-acid isomerization kinetics was performed in aqueous buffer solution as a function of time (0-90 min) and heating temperature (80-100 degrees C). Rate constants and activation energies for the formation of individual iso-alpha-acids were determined. It was found that iso-alpha-acid formation follows first-order kinetics and Arrhenius behavior. Differences in activation energies for the formation of trans- and cis-isomers were noticed, the activation energy for the formation of trans-iso-alpha-acids being approximately 9 kJmol (-1) lower.
ISSN: 0021-8561
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Technologiecluster Bioengineering Technologie
Bioengineering Technology TC, Technology Campuses Ghent and Aalst
× corresponding author
# (joint) last author

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