title: Enantiomeric analysis of beta-pinene and limonene by direct coupling of reversed phase liquid chromatography and gas chromatography using absorbents as packing materials.
abstract: A method based on the use of absorbents as packing materials inside the interface of the online coupling between RPLC and GC is proposed for the enantiomeric analysis of beta-pinene and limonene in essential oils. For that purpose, a comparison of the RSD, detection limit and recovery provided by two absorbents and one adsorbent is included in this study. The results found in this work proved the validity of absorbents as packing materials in online RPLC-GC to determine minor compounds in complex matrices. In particular, PDMS seemed to be specially useful to analyse nonpolar compounds, such as beta-pinene and limonene, since it provided higher sensitivity for this kind of compounds. The developed method was applied to the evaluation of the natural and non-natural character of commercial essential oils by means of the determination of the enantiomeric composition of beta-pinene and limonene.
authors.affiliation: Instituto de Fermentaciones Industriales, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
authors.forename: Gema
authors.initials: G
authors.lastname: Flores
authors.forename: Maria Luisa
authors.initials: ML
authors.lastname: Ruiz del Castillo
authors.forename: Marta
authors.initials: M
authors.lastname: Herraiz