Rapid adulteration detection of cold pressed oils with their refined versions by UV–Vis spectroscopy

• Published in: Scientific reports 2020-09, Vol.10 (1), p.16100-16100, Article 16100
• Main Authors: Popa, Simona, Milea, Marius Silviu, Boran, Sorina, Nițu, Sabina Violeta, Moșoarcă, Giannin Emanuel, Vancea, Cosmin, Lazău, Radu Ioan
• Format: Article
• Language: English
• Subjects: 639/638; 692/700/2814; Cold; Humanities and Social Sciences; Infrared spectroscopy; multidisciplinary; Oils & fats; Peroxide; Science; Science (multidisciplinary); Spectrum analysis
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-72558-7

The aim of this study is the rapid detection of food pressed oils adulteration with their refined versions, using UV–Vis spectroscopy. The study investigates some common oil physico-chemical parameters such are: density, viscosity, refractive index, acid index, peroxide value, saponification index, to detect differences between cold pressed oils versus refined ones, for some food-grade oils found on Romanian market, as well as FT-IR spectroscopy and GC–MS analytical method, obtaining similar results to those presented in the literature data. The difference between some of the obtained results is not relevant for telling the cold-pressed oils from their refined version for adulteration investigation purpose. Colour analysis instead is a very good method to differentiate a cold pressed oil from a refined one. Taking this into account, the cold pressed oils and their refined versions were mixed in different proportions, and their colour properties were analyzed, obtaining linear dependences for a* and b * CIE L*a*b* parameters with cold pressed oil content in the mixture. Dependence equations were proposed.