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MO: Fachverband Molekülphysik

MO 13: Molekülphysik Poster 1

MO 13.29: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer

VIS Raman Spectroscopy for the Classification of and Adulteration Detection in Vegetable Oils — •Rasha Hassanein, Patrice Donfack, and Arnulf Materny — Jacobs University Bremen, Germany

Raman spectroscopy with visible light (VIS) excitation in combination with multivariate analysis is an efficient technique for the characterization of olive oil; it also can be used for an early detection of oil adulteration. Major advantages are, (i) it requires no sample preparation, (ii) it is a rapid and nondestructive tool, and (iii) when combined with e.g. fiber optics, it can be used directly in industrial processes. In our work, we have demonstrated the potential capabilities of dispersive Raman spectroscopy using VIS excitation in combination with appropriate chemometric methods for the investigation and identification of different vegetable oils. Moreover, the adulteration of olive oil with similar oils such as sunflower oil – which is a common adulterant for olive oil because of its high oleic content – could be detected even for very low concentrations; detection limits down to 500 ppm of the adulterant have been achieved without considerable effort. To our knowledge, the advantages of VIS Raman spectroscopy were up to now not utilized for olive oil characterization. However, due to the VIS excitation increased signal intensities result for components at low concentration (e.g. for carotenoids); but also in general stronger Raman signals can be expected due to the ν⁴-dependence of the scattering process. The latter effect results in very short measuring times.