Detection of the adulteration of olive oils by solid phase microextraction and multidimensional gas chromatography |
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Authors: | Gema Flores Maria Luisa Ruiz del CastilloGracia Patricia Blanch Marta Herraiz |
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Affiliation: | Instituto de Fermentaciones Industriales, Consejo Superior de Investigaciones Científicas (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain |
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Abstract: | The presence or absence of filbertone in 21 admixtures of olive oil with virgin and refined hazelnut oils obtained using various processing techniques from different varieties and geographical origins was evaluated by solid phase microextraction and multidimensional gas chromatography (SPME–MDGC). The obtained results showed that the sensitivity achievable with the proposed procedure was enough to detect filbertone and, hence, to establish the adulteration of olive oil of different varieties with virgin hazelnut oils in percentages of up to 7%. The very low concentrations in which filbertone occurs in some refined hazelnut oils made difficult its detection in specific admixtures. In any case, the minimum adulteration level to be detected depends on the oil varieties present in the adulterated samples. In the present study, the presence of R- and S-enantiomers of filbertone could be occasionally detected in olive oils adulterated with 10–20% of refined hazelnut oil. |
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Keywords: | Enantiomers Multidimensional gas chromatography Olive oil adulteration Refined hazelnut oil Solid-phase microextraction |
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