Direct classification of olive oils by using two types of ion mobility spectrometers |
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Authors: | Garrido-Delgado Rocío Mercader-Trejo Flora Sielemann Stefanie de Bruyn Wolfgang Arce Lourdes Valcárcel Miguel |
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Institution: | Department of Analytical Chemistry, University of Córdoba, Campus of Rabanales, Spain. |
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Abstract: | In this work, we explored the use of an Ion Mobility Spectrometry (IMS) device with an ultraviolet (UV) source, and of a Gas Chromatographic (GC) column coupled to an IM Spectrometer with a tritium source, for the discrimination of three grades of olive oil, namely: extra virgin olive oil (EVOO), olive oil (OO) and pomace olive oil (POO). The three types of oil were analyzed with both equipment combinations as coupled to a headspace system and the obtained ion mobility data were consecutively processed with various chemometric tools. The classification rate for an independent validation set was 86.1% (confidence interval at 95% 83.4%, 88.5%]) with an UV-IMS and 100% (confidence interval at 95% 87%, 100%]) using a GC-IMS system. The classification rate was improved by using a more suitable ionization source and a pre-separation step prior to the IM analysis. |
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