A Happy, Hoppy Odyssey: From a Flavorsome Hobby to a Dream Job

Keukeleire, Denis De

doi:10.1094/asbcj-2017-4795-01

Cited by 1 publication

(1 citation statement)

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“…The use of hops or hop-derived products is essential in beer brewing, and it distinguishes beer from any other alcoholic beverage. , Although only a few grams are used, and about 100 mg of hop-derived compounds remain in a liter of beer, still they account for most typical attributes. Bitterness, aroma, natural preservation, and foam head formation are among the most noticed.…”

Section: Introductionmentioning

confidence: 99%

Radical Intermediates in the Degradation of Hop Acids

Berton¹,

Verbeke

Durme

et al. 2021

J. Agric. Food Chem.

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Radical formation in isohumulones was investigated under different types of stress, including temperature, transition metal ions, and hydrogen peroxide. Including dihydroisohumulones and tetrahydroisohumulones, as relevant analogues, allowed us to evaluate critical functionalities in radical formation. Using spin-trapping methodology with 5,5-dimethyl-1-pyrroline N-oxide and N-tert-butyl-α-phenylnitrone as relevant traps, followed by simulation of corresponding spin adducts, identification of incipient radicals was attempted. The isohexenoyl side chain in isohumulones, but not present in dihydro- and tetrahydroisohumulones, was most sensitive to radical formation. Kinetic profiles further demonstrated that radical formation in this moiety was accelerated in the presence of ferrous ions. Reactivity of parent six-membered-ring humulones in radical formation was different, as scavenging of free radical species was more important. Lupulones, despite similarity with humulones, showed a different behavior with an obvious radical decay pathway during ageing, mainly ascribed to radical formation on the ring structure. Quantification of final spin adducts allowed us to determine absolute importance of the different degradation pathways. Eventually, mechanisms are presented explaining why isohumulones are more prone to radical processes in (aut)oxidation and thermal decay than close relatives such as dihydroisohumulones.

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Section: Introductionmentioning

confidence: 99%