Pure extra virgin olive oil (EVOO) is mixed with cheaper edible oils and samples are kept inside clear glass containers, while a 785nm Raman system is used to take measurements as Raman probe is placed against glass container. Several types of oils at various concentrations of adulteration are used. Ratios of peak intensities are used to analyze raw data, which allows for quick, easy, and accurate analysis. While conventional Raman measurements of EVOO may take as long as 2 minutes, all measurements reported here are for integration times of 15s. It is found that adulteration of EVOO with cheaper oils is detectable at concentrations as low as 5% for all oils used in this study.

Date Published: 26 September 2016
PDF: 7 pages
Proc. SPIE 9933, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2016, 99330K (26 September 2016); doi: 10.1117/12.2238369

Published in SPIE Proceedings Vol. 9933:
Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2016
Manijeh Razeghi; Dorota S. Temple; Gail J. Brown, Editor(s)