Olive oil authentication based on quantitative β-carotene Raman spectra detection. (15th December 2022)

• Record Type: Journal Article
• Authors: Fang, Peipei; Wang, Hongpeng; Wan, Xiong
• Is Part Of: Food chemistry. Volume 397(2022)
• Publication Date: 2022-12-15
• Subjects: EVOO extra virgin olive oil -- SSO sunflower seed oil -- SVR support vector regression -- DFT density functional theory; β-carotene -- Olive oil -- Adulteration -- Raman spectroscopy -- SVR -- DFT; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2022.133763
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: A laser confocal Raman technique to detect synthetic olive oil. The Raman spectra of sunflower seed oil adulterated β-carotene was collected and are combined with SVR to detect quantification of β-carotene. Similarity analysis between synthetic olive oil and the real olive oil. Density Functional Theory was utilized for analysis of assignments of Raman peaks. Abstract: β-carotene and oleic acids are important molecules to distinguish between extra olive oil (EVOO) and other oils. To identify adulteration which use common vegetable oils blended with β-carotene to imitate EVOO, a non-invasive, lossless method is proved to be effective. The present work presents a laser confocal Raman technique for analyzing and comparing the differences of molecule between EVOO and SSO, which based on theoretical Raman spectra of β-carotene, oleic acids and linoleic acids calculated by density functional theory (DFT). Chemometrics based on support vector regression (SVR) was used to realize quantitative analysis of β-carotene in synthetic olive oils. Nine different volume ratios were prepared independently, and test set evaluation index of linear kernel of SVR as follow: RMSE 0.0653, R 2 0.9868. The results show that laser confocal Raman technique, combined with theoretical Raman spectra based on DFT, could analyze composition of vegetable oil accurately, and identify low-cost imitation of olive oil.