Photopyroelectric Detection of Vegetable Oils' Adulteration
2009
Streza, M. | Dadarlat, D. | Socaciu, C. | Bele, C. | Dulf, F. | Simon, V.
Highly accurate photopyroelectric (PPE) investigation, in the thermal-wave-resonator-cavity configuration, was combined with gas chromatography (GC), in order to detect adulteration of flax oil by mixing with sunflower oil. It was found that the value of the thermal diffusivity for the investigated mixtures ranges from 8.07 x 10⁸m²/s (pure sunflower oil) to 10.03 x 10⁸m²/s (pure flax oil) and is directly correlated with the total amount of the polyunsaturated fatty acids from oils composition. The correlation between the PPE signal and the composition of unadulterated and adulterated vegetable oils confirms the data obtained previously on fresh and spoiled vegetable oils and suggests that the thermal diffusivity may be a suitable parameter to detect oils' quality and their early spoilage and adulteration.
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