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• W3188633431 endingPage "9653" @default.
• W3188633431 startingPage "9642" @default.
• W3188633431 abstract "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." @default.
• W3188633431 created "2021-08-16" @default.
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• W3188633431 date "2021-08-12" @default.
• W3188633431 modified "2023-09-27" @default.
• W3188633431 title "Radical Intermediates in the Degradation of Hop Acids" @default.
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• W3188633431 doi "https://doi.org/10.1021/acs.jafc.1c02977" @default.
• W3188633431 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34382782" @default.
• W3188633431 hasPublicationYear "2021" @default.
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