Comparative chemometric analysis of fluorescence and near infrared spectroscopies for authenticity confirmation and geographical origin of Argentinean extra virgin olive oils

• Published in: Food control Vol. 96; pp. 22 - 28
• Main Authors: Jiménez-Carvelo, Ana M., Lozano, Valeria A., Olivieri, Alejandro C.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2019
• Subjects: Adulteration; Chemometrics; Extra virgin olive oil; Fluorescence; Geographical origin; NIR spectroscopy; Fluorescence; Geographical origin; Extra virgin olive oil; NIR spectroscopy; Adulteration; Chemometrics
• ISSN: 0956-7135; 1873-7129
• DOI: 10.1016/j.foodcont.2018.08.024

Extra virgin olive oil (EVOO) is widely used in gastronomy because of its healthy properties, and is a candidate to be adulterated with other vegetable oils to reduce costs. This work shows the results of applying near infrared (NIR) and fluorescence excitation–emission matrix spectroscopies, coupled to chemometric tools, to authenticate and validate the geographic origin of Argentinean EVOO samples. For each spectral data set, principal component analysis (PCA) was applied to both first–order NIR and second–order fluorescence data, partial least squares–discriminant analysis (PLS1–DA) to NIR data, and the multidimensional version of the latter (NPLS–DA) to fluorescence data. The results of the study of sixty EVOO samples of known and unknown registered designation of origin (RDO), as well as artificial samples adulterated with other edible oils, showed that: (1) fluorescence spectroscopy was unable to determine the RDO of all EVOO samples, in contrast to NIR (100% classified correctly), and (2) fluorescence data provide only slightly better results than NIR spectroscopy to detect EVOO adulterations with other vegetable edible oils. [Display omitted] •NIR and fluorescence techniques were compared to verify quality–levels of EVOO.•The two techniques were successfully employed with PCA and PLS–DA algorithms.•It is the first time that Argentinean EVOO samples were analyzed.•EVOO adulterated samples were detected with both spectroscopies–PCA techniques.•RDOs were verify with NIR–PLS–DA technique.