Effectiveness Evaluation of Illegal Cooking Oil Identification Based on Fourier Transform Infrared Spectroscopy
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Abstract:
One hundred-thirty seven oil samples including edible vegetable oil, raw vegetable oil, kitchen-waste oil and fried waste oil were collected. And 17 refined illegal cooking oil samples were prepared. Fourier transform infrared spectroscopy (FITR) was used to discriminate the difference in the oil samples. The shape of spectra in 1711 cm-1 and peak height ratios in 1711 cm-1 and 1745 cm-1 were analyzed and evaluated the effectiveness to separate illegal cooking oil from edible vegetable oil. The results showed that the infrared absorption peak in 1711 cm-1 or the double peaks in 1711 cm-1 and 1745 cm-1 were not specific for illegal cooking oil, but highly related to the oil acid value with positive correlation, which decreased when the acid value of illegal cooking oil decreased by refining or blending. Therefore, the FI-TR absorption peaks could not discriminate illegal cooking oil from edible vegetable oils.
