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Characterization of extra virgin olive oils adulterated with sunflower oil using different physical methods
| Content Provider | Semantic Scholar |
|---|---|
| Author | Yovcheva, Temenuzhka Nikolova, Kr. Viraneva, A. P. Bodurov, I. Eftimov, Tinko |
| Copyright Year | 2014 |
| Abstract | This paper describes a study of the usefulness of some physical methods in the detection of adulteration of extra virgin olive oil with controlled concentration of relatively cheap sunflower oil. We have tested three physical methods measuring refractive indices (RI) and their dispersion curves, fluorescence spectra and color parameters that are related to the chemical structure and content of the olive oils. The RI values of the samples were measured with a total experimental uncertainty of less than 3×10 -4 by the method of the disappearing diffraction pattern for two wavelengths – 405 nm and 532 nm at a temperature 23 o C. Fluorescence spectra were measured using a fiber optic spectrometer (AvaSpec-2038, Avantes) and the samples were excited by light emitting diodes at 370 nm, 395 nm, 425 nm and 450 nm using the set up. The spectrometer's sensitivity is in the (200 – 1100) nm range with a resolution of about 8 nm. The color parameters (index of lightness L*, a*, b*, chroma C* and hue angle hab) corresponding to the uniform color space CIELab, were determined on a Lovibond PFX 880. The color parameters were used for determining the β – carotene and chlorophyll content in the investigated samples. All of the obtained experimental results suggest that the three optical methods presented are correlated and could be useful for a fast detection of sunflower adulteration of extra virgin olive oils. These techniques are sensitive and rapid and also do not require any additional chemical agents. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.bcc.bas.bg/BCC_Volumes/Volume_46_Special_B_2014/BCC-46-B-16-19.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
