title: Liquid chromatography/mass spectrometry and liquid chromatography/nuclear magnetic resonance as complementary analytical techniques for unambiguous identification of polymethoxylated flavones in residues from molecular distillation of orange peel oils (Citrus sinensis).
abstract: Liquid chromatography/mass spectrometry and liquid chromatography/nuclear magnetic resonance techniques with ultraviolet/diode array detection were used as complementary analytical tools for the reliable identification of polymethoxylated flavones in residues from molecular distillation of cold-pressed peel oils of Citrus sinensis. After development of a liquid chromatographic separation procedure, the presence of several polymethoxy flavones such as sinensetin, nobiletin, tangeretin, quercetogetin, heptamethoxyflavone, and other derivatives was unambiguously confirmed. In addition, proceranone, an acetylated tetranortriterpenoid with limonoid structure, was identified for the first time in citrus.
authors.affiliation: Symrise GmbH and Co. KG, Corporate Research Division, 37601 Holzminden, Germany. berthold.weber@symrise.com
authors.forename: Berthold
authors.initials: B
authors.lastname: Weber
authors.forename: Beate
authors.initials: B
authors.lastname: Hartmann
authors.forename: Detlef
authors.initials: D
authors.lastname: Stöckigt
authors.forename: Klaus
authors.initials: K
authors.lastname: Schreiber
authors.forename: Michael
authors.initials: M
authors.lastname: Roloff
authors.forename: Heinz-Jürgen
authors.initials: HJ
authors.lastname: Bertram
authors.forename: Claus O
authors.initials: CO
authors.lastname: Schmidt
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D032084:Citrus sinensis / Q000737:chemistry*; D047309:Flavones / Q000032:analysis* / Q000737:chemistry; D005638:Fruit / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010938:Plant Oils / Q000737:chemistry*
chemical_list: D047309:Flavones; D010938:Plant Oils