title: HPLC separation and NMR structural elucidation of sn-1,2-, 2,3-, and 1,3-diacylglycerols from olive oil as naphthylethylurethane derivatives.
abstract: In this study, sn-1,2-, sn-2,3-, and sn-1,3-diacylglycerols were isolated from olive oil, and their urethane derivatives (urethanes) were prepared. Normal-phase high-performance liquid chromatography (NP-HPLC) separation of the urethane isomers was performed and the separate classes were studied by nuclear magnetic resonance (NMR). The use of 1H NMR and homo- and heteronuclear 2D techniques provided a great amount of information in a very short time, particularly when a high-field NMR instrument (700 MHz) was used. Particularly diagnostic for this kind of compound was the glyceridic moiety that presents typical chemical shifts both for carbon and hydrogen. These studies show the usefulness of NMR spectroscopy to recognize clearly the sn-1,3- and, moreover, sn-1,2- with respect to sn-2,3-diacylglycerols, although very minor differences occur between them.
authors.affiliation: Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, via del Liceo 1, 06123 Perugia, Italy.
authors.forename: O
authors.initials: O
authors.lastname: Rosati
authors.forename: S
authors.initials: S
authors.lastname: Albrizio
authors.forename: D
authors.initials: D
authors.lastname: Montesano
authors.forename: R
authors.initials: R
authors.lastname: Riccieri
authors.forename: L
authors.initials: L
authors.lastname: Cossignani
authors.forename: M
authors.initials: M
authors.lastname: Curini
authors.forename: M S
authors.initials: MS
authors.lastname: Simonetti
authors.forename: L
authors.initials: L
authors.lastname: Rastrelli
authors.forename: P
authors.initials: P
authors.lastname: Damiani
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004075:Diglycerides / Q000737:chemistry* / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry*; D014520:Urethane / Q000737:chemistry*
chemical_list: D004075:Diglycerides; D000069463:Olive Oil; D010938:Plant Oils; D014520:Urethane