Application of infrared spectrophotometry to fatty acid derivatives

Keto Fatty Acids Derived from Castor Oil. I. Unsaturated Acids1

“…Spectra.-The infrared spectra of the unsaturated keto fatty acids are in good agreement with spectra reported in the literature for long chain saturated and unsaturated fatty acids 25. …”

The evaluation of cosmetic and pharmaceutical emulsions aging process using classical techniques and a new method: FTIR

“…8), after 6-month storage at 50 • C, display the appearance of additional bands at about the ester C O stretching. According to O'Connor (1956), the increase of three bands observed at 1736, 1728, and 1718 cm −1 indicates the formation of saturated aldehydes (1736, 1728 cm −1 ) and saturated ketones (1718 cm −1 ). These species probably result from the spontaneous decomposition of hydroperoxides by scission.…”

Assessment of Oxidation in Heated Safflower Oil by Physical, Chemical and Spectroscopic Methods

“…A comparison of the published spectra of major fatty acids in, the oil, i.e., linoleic acid (which is the one that has undergone oxidation) with the spectra of oxidized fatty acids isolated from heated oil ( Fig. 13 and 14) indicated many changes in the linoleic acid molecule (Hopkins 1961;Gunstone 1967;O'Connor 1956O'Connor , 1960Wanasundara and Shahidi 1993). The olefinic proton signal at 5.4 ppm and allylic proton signal at 2.85 ppm completely disappeared from the heated oil in 10-15 min (Table 3).…”