The use of ATR‐FTIR spectroscopy to measure changes in the oxirane content and iodine value of vegetable oils during epoxidation

Abstract

The cover shows a new method to directly perform enzymatic hydrolysis reaction on a TLC plate. With a connection between two-dimensional chromatography and in situ enzymatichy-drolysis, a TLC plate can play following roles: a separation tool, an enzymatic reaction carrier and an non-destructive identifi cation tool. GC-MS chromatograms of fatty acids released from diff erent positions of PC are attached as well. 1600349 Dietary-sitosterol is more potent in reducing plasma cholesterol than sesamin in hypercholesterolemia hamsters

Synthesis and Characterization of Biobased Epoxidized Edible Oils

“…Previously, Tavassoli-Kafrani et al (2017) successfully used ATR-FTIR method to determine the oxirane oxygen content (OOC) produced in the epoxidation process of vegetable oils by measuring the changes in epoxy functional group absorption in the range of n=1497 -1432 cm -1 . In this current work, peaks at 721.38 cm -1 and 820 cm -1 , albeit low intensity, were attributed to the presence of the C-O-C oxirane, and in agreement with previous findings reported by Vlcek and Patrovic (2006).…”

“…However, the presence of -C=CH deformational characteristic peaks (~n=1420 cm -1 ) in both oil samples and additional band attributed to the C-H stretching next to carboncarbon double bond, -C=C-H (n=3010 cm -1 ) in epoxidized soybean oil also suggested the oils still contained the unmodified double bonds. Previously, the presence of low intensity peak at the range of n=3017 -3004 cm -1 was used to measure the relative changes in iodine value (represent carbon-carbon double bond) of unreacted edible oils (Tavassoli-Kafrani et al, 2017). Basically, the process in changing the chemical structure of these types of oils into epoxy functional group is the same for the other vegetable oils.…”

The lanolin‐based oil plasticized polylactide: Thermal and chemical characteristics

“…This means that the double bonds were converted on the formation of epoxy, which is confirmed by the peak at 814 cm À1 due to the stretching of the C O C of the epoxy (oxirane oxygen content) group. [21,40,41] The absorption peak that appears at 1456 cm À1 is also due to epoxy group C C stretching. [40] The appearance of a peak at 948 cm À1 due to the presence of epoxy group further validates that the oil plasticizer contains epoxy group.…”

Catalytic developments in the epoxidation of vegetable oils and the analysis methods of epoxidized products

“…15 A rapid attenuated total reectance Fourier transform infrared (ATR-FTIR) method was used for the determination of oxirane oxygen content (OOC) and changes in the iodine value of VOs. 174 First, the initial iodine values (IV i ) of VOs were obtained from the GC analysis. Second, to draw the FTIR calibration curve, ECO and CO were subsequently blended in a series of 10 g samples with different ratios of 0.0 to 1.0 of ECO relative to the sum of the two constituents (ECO/[ECO + CO]) using ECO intervals of $0.1.…”