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| Discerning of vegetable oils and swill-cooked dirty oils by second derivativeFourier transform infrared spectroscopy |
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| KeyWord:Fourier transform infrared spectroscopy swill-cooked dirty oil vegetable oil second derivative spectra |
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| Abstract: |
| The second derivative spectra of edible vegetable oils, swill-cooked dirty oils, and simulated reheated edible vegetable oils were analyzed using Fourier transform infrared spectroscopy method. The results showed that the contents of saturated fatty acids and trans fatty acids in swill-cooked dirty oils and simulated reheated edible vegetable oils were significantly higher than those of normal edible oil. The changes of characteristic absorption peaks at 3 009,1 737,966,723 cm-1 in second derivative spectra could be used to identify swill-cooked dirty oils. The method had the items of less consumption of samples, no pre-treatment and rapid velocity of analysis. The results provided the foundation to establish an identification method of swill-cooked dirty oils. |
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