title: Biosynthetic experiments with tall plants under field conditions. 18O2 incorporation into humulone from Humulus lupulus.
abstract: Five segments of a large hop plant (Humulus lupulus var. Hallertauer Magnum) carrying several cones were enclosed in sealed glass vessels that were gassed with (18)O(2). After 14 days, the segments were harvested and humulone and cohumulone were analysed by NMR spectroscopy and mass spectroscopy. The oxygen atoms in position 6 of humulone and cohumulone showed 9% (18)O enrichment, respectively. It follows that the C-6 hydroxy groups were introduced by oxygenase catalysis.
authors.affiliation: Lehrstuhl für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Hecht
authors.forename: Klaus
authors.initials: K
authors.lastname: Kammhuber
authors.forename: Josef
authors.initials: J
authors.lastname: Reiner
authors.forename: Adelbert
authors.initials: A
authors.lastname: Bacher
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Eisenreich
mesh_terms: D003512:Cyclohexanones / Q000737:chemistry / Q000378:metabolism; D053138:Cyclohexenes; D027582:Humulus / Q000254:growth & development / Q000378:metabolism*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010100:Oxygen / Q000493:pharmacokinetics*; D010103:Oxygen Isotopes; D010105:Oxygenases / Q000378:metabolism; D012107:Research Design; D013729:Terpenes / Q000737:chemistry / Q000378:metabolism*
chemical_list: D003512:Cyclohexanones; D053138:Cyclohexenes; D010103:Oxygen Isotopes; D013729:Terpenes; C442487:cohumulone; C442488:adhumulone; D010105:Oxygenases; C007966:humulon; D010100:Oxygen