Determination of the enantiomeric composition of gamma-lactones in edible oils by on-line coupled high performance liquid chromatography and gas chromatography |
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Authors: | Ruiz Del Castillo M L Herraiz M Blanch G P |
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Institution: | Instituto de Fermentaciones Industriales, CSIC, c/ Juan de la Cierva 3, 28006 Madrid, Spain. |
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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. |
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