TITLE:
Characterization of Vegetable Oils by Fluorescence Spectroscopy
AUTHORS:
Yvon Gilbert Mbesse Kongbonga, Hassen Ghalila, Marthe Boyomo Onana, Youssef Majdi, Zohra Ben Lakhdar, Houda Mezlini, Sylvie Sevestre-Ghalila
KEYWORDS:
Vegetable Oils, Oxidation, Refined and Unrefined Oils, Unsaturated Fatty Acid, Fluorescence Spectroscopy and Principal Component Analysis (PCA)
JOURNAL NAME:
Food and Nutrition Sciences,
Vol.2 No.7,
September
20,
2011
ABSTRACT: Results presented in this paper show the ability to analyze vegetable oils with very cheap and easy method based on fluorescence spectroscopy. We have recorded, with a very simple experimental set up, fluorescence spectra for several vegetable oils at excitation wavelength λex = 370 nm. After deconvolution, using a Lorentzian profile, and identification of the stripes forming the spectra, a normalization of the intensities was made with respect to the vitamin E band with λ= 525 nm taken as reference. A statistical method based on Principal Component Analysis (PCA) is used to emphasize differences between refined and unrefined oils. We also noticed a significant difference between fluorescence of the argan cosmetic oil and edible argan oil due to the heating of the second one during its preparation. Stability to thermal oxidation of high oleic sunflower oil compared to the extra virgin olive, argan cosmetic and refined corn oils is also shown.