Journal
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
Volume 20, Issue 9, Pages 2003-2015Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10942912.2016.1230744
Keywords
Plant oils; Infrared and Raman spectra; Lorentz deconvolution; Iodine value; Quantitative analysis of unsaturation degree
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Funding
- Embassy of Libya
- Polish Ministry of Science and Education
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Thirteen edible oils: sunflower, avocado, hemp, high-linolenic flax, low-linolenic flax, safflower, walnut, roasted sesame, rice, corn, rapeseed, pumpkin seed, and hazel were studied in this work. Their fatty acid composition, iodine, acidic, peroxide, and saponification values were determined. Infrared and Raman spectra of the oils were recorded in the range 400-3200 cm(-1). The integral intensities of the bands at about 1655 and 2852 cm(-1) corresponding to (C=C) and (CH2) vibrations were evaluated and used to construct a relationship between the spectroscopic data and the iodine value. The following linear dependencies were obtained: I-(C=C)/I-(CH2) = 7.449 x 10(-4) x iodine value - 0.0339 and I-(C=C)/I-(CH2) = 9.299 x 10(-4) x iodine value - 0.023 for the infrared and Raman spectra with a correlation coefficient 0.988 and 0.976, respectively. These calibration lines can be used to determine the iodine value for oils with unknown unsaturation level, and may be applied for margarines and other fatty materials.
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