P. ARON (1), M. Eurich (2), M. Raver (3); (1) MillerCoors, Milwaukee, WI, U.S.A.; (2) MillerCoors., Golden, CO, U.S.A.; (3) Yakima Chief Inc., Sunnyside, WA, U.S.A.

Poster

The authors have identified a previously unreported compound in commercially produced supercritical CO₂ hop extracts. The compound, initially thought to be a contaminant from either the process or packaging, was positively identified by GCTOF-MS and SPME-GC-MS to be a naturally derived degradation product of hop acids. A cross-functional investigation into raw materials, CO₂ processing and storage liners (Py-GC/MS) was conducted to reveal its identity as 1,3-pentadiene. A mechanism has been proposed for the formation of 1,3-pentadiene from the degradation of side chains of both alpha and beta hop acids. Further investigation revealed that 1,3-pentadiene is either carried into or formed in lager beer produced with commercial hop extracts. The authors propose that 1,3-pentadiene content in pellets, hop extracts, and lager beer may give insight into hop and beer quality pertaining to flavor stability.

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