title: Determination of the enantiomeric composition of gamma-lactones in edible oils by on-line coupled high performance liquid chromatography and gas chromatography.
abstract: A new method is proposed for the determination of the enantiomeric composition of gamma-lactones in different vegetable edible oils (i. e., olive oil, almond oil, hazelnut oil, peanut oil, and walnut oil), and its potential for authenticity control is underlined for a limited number of samples. The method is based on the direct injection (i.e., without requiring a sample pretreatment step) in on-line coupled reversed phase liquid chromatography to gas chromatography (RPLC-GC) using a chiral stationary phase in the GC-step. Different experimental values for both speed of sample introduction into GC and volume of the transferred fraction are considered to improve the recoveries obtained. Relative standard deviations lower than 10% and detection limits ranging from 0.06 to 0.22 mg/L were achieved for the investigated gamma-lactones.
authors.affiliation: Instituto de Fermentaciones Industriales, CSIC, c/ Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: M L
authors.initials: ML
authors.lastname: Ruiz Del Castillo
authors.forename: M
authors.initials: M
authors.lastname: Herraiz
authors.forename: G P
authors.initials: GP
authors.lastname: Blanch
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D007783:Lactones / Q000032:analysis* / Q000737:chemistry*; D009754:Nuts / Q000737:chemistry; D000069463:Olive Oil; D009862:Online Systems; D000074241:Peanut Oil; D010938:Plant Oils / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D007783:Lactones; D000069463:Olive Oil; D000074241:Peanut Oil; D010938:Plant Oils