title: Identification of quinoline, carboline and glycinamide compounds in cow milk using HRMS and NMR.
abstract: The aim of this work was to characterise new UV-absorbing compounds (UAC) in cow milk in order to gain an overview of the molecular diversity of the minor bioactive constituents, that could be used to trace animal feed or that potentially affect milk quality. UAC were extracted from lyophilized milks, partitioned using SPE C-18 cartridges, purified by semi-preparative HPLC then analysed by HPLC/DAD/HRMS in both ESI(-) and ESI(+) ionisation mode. Compounds that remained unidentified after comparison with UV and MS databases were analysed by 1D and 2D NMR techniques. The identification and structural elucidation of N-cinnamoylglycine, 2,4-, 2,6-, 2,8-quinolinediols, and 1-methyl-3-carboxy-beta-carboline are described.
authors.affiliation: INRA, UMR1213 Herbivores, F-63122 St-Genès-Champanelle, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Rouge
authors.forename: Agnès
authors.initials: A
authors.lastname: Cornu
authors.forename: Anne-Sophie
authors.initials: AS
authors.lastname: Biesse-Martin
authors.forename: Bernard
authors.initials: B
authors.lastname: Lyan
authors.forename: Nadège
authors.initials: N
authors.lastname: Rochut
authors.forename: Benoît
authors.initials: B
authors.lastname: Graulet
mesh_terms: D000818:Animals; D002243:Carbolines / Q000737:chemistry*; D002417:Cattle; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008892:Milk / Q000737:chemistry*; D015394:Molecular Structure; D011804:Quinolines / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D002243:Carbolines; D011804:Quinolines; C018556:glycine amide; C037219:quinoline; D005998:Glycine
keywords: Cow milk; HPLC–DAD; HRMS; Multidimensional NMR; UV-absorbing compound