Chemistry and analysis of hop and beer bitter acids
Largely based on laboratory work, the volume opens with a review on hops in general, while the bulk of the book covers the chemistry of the bitter acids of hop and beer. Practical, fully detailed procedures on the preparation and/or the separation of many of the compounds discussed are included. There is a chapter included on the complicated issue of bitter acid analysis, and several on the high-efficiency liquid chromatography of hop bitter acids. Bearing in mind the lack of literature produced recently in this field, the book is an excellent review of the present state of knowledge, and gives a large list of topics pointing to worthwhile studies for the future. The indexes provided will serve as a reference library-dictionary to hops, hop and beer bitter acids chemistry and analysis.
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The alpha acids
Reduced derivatives of humulone
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1H NMR spectrum 3-methyl-2-butenyl side chain ABX-spin system acetate AClDS adhumulone adlupulone allo-isohumulones alpha acids alpha acids content Anteunis anti-isohumulones aqueous buffer pH beer Beiges beta acids boiling Brewing Chemists carbon atom CCl4 CDCl3 Chem Chim cis and trans cis isohumulone cohulupone cohumulone column colupulone compounds counter-current distribution deacylated derivatives double bond eluent enol formation hexane hop alpha acids hop bitter acids hop extracts hulupones humulinone humulone hydrogen hydrogenolysis iso-alpha acids iso-octane isolated isomerization isomers Keukeleire lnst lupulone Mass spectrum melting point methanol methine methine proton methyl groups molecular formula NaOH nm in alkaline nm in EtOH nm in MeOH NMR 60 MHz obtained occurs optical oxidation oxidation products oxygen proton racemic reaction mixture recrystallization residue side chain signals silica gel singlet sodium solution solvent spectra Structural formulae tautomers thin layer chromatography trans isohumulone Verzele Xmax yield