Rapid evaluation of the linoleic-to-oleic acid ratio in sunflower oil using Raman spectroscopy
S.M. Kuznetsov1, D.D. Vasimov1,2, Z.I. Kalugina3, V.I. Andreev1,4, V.S. Novikov1, E.A. Sagitova1; 1Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia; 2Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia; 3Research Institute of Canning Technology – branch of the V. M. Gorbatov Federal Research Center for Food Systems of the RAS, Vidnoe, Moscow region, Russia;
4D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia
Abstract
Sunflower oils are commonly classified as linoleic, mid-oleic, or high-oleic according to their fatty-acid composition. Thus, the ratio of linoleic and oleic acid content is an important feature of sunflower oil quality. Currently, rapid methods for determining this ratio are required both for the control of finished products and for detecting counterfeit goods. However, the development of such methods remains insufficient. In this study, we applied Raman spectroscopy and gas chromatography techniques in conjunction with multivariate statistical approaches in order to study linoleic, high-oleic and mid-oleic sunflower oils, as well as their blends.
The results of the study demonstrate the ability of Raman spectroscopy combined with principal component analysis to determine successfully the ratio of content of linoleic and oleic acids in sunflower oil with the non-overlapping 95 % confidence ellipses for groups separated by 10 mass % increments indicating reliable differentiation between them. The partial least squares regression applied to the spectral region of 600 - 1800 1/cm predicted oleic acid content with the high R^2 values for both the train and test datasets. These results demonstrate that Raman spectroscopy combined with multivariate methods enables rapid and reliable differentiation of sunflower oils according to their linoleic-to-oleic acid ratio.
This work was supported by the Russian Science Foundation grant № 25-26-00752
https://rscf.ru/en/project/25-26-00752/.
Speaker
Kuznetsov Sergey
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
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