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Thermally Induced Cis-Trans Isomerisationin Trilinolein Studied by InfraredSpectroscopy and Gas Chromatography
| Content Provider | Semantic Scholar |
|---|---|
| Author | Christy, Alfred Antony Arachchi, Subashini L. |
| Copyright Year | 2016 |
| Abstract | Trilinolein, a triglyceride containing linoleic acid as the only acid moiety in the glyceride molecules has been isothermally treated at 250 0C, 275 0C and 300 0C in sealed glass ampoules. The products formed during the thermal treatment at each temperature have been analysed both by infrared spectrophotometry and gas chromatography. In infrared spectroscopy the samples were analysed by transflectance technique using a single reflectance attenuated total internal reflectance crystal and a lead glycine sulphate detector. Second derivative profiles of the infrared spectra of the heated samples were obtained for the analysis of the peaks. The fatty acids in remaining triglyceride samples after infrared analysis were subjected to derivatisation into methyl esters. The methyl esters were then subjected to GC analysis. The second derivatives of the infrared profiles of the heated samples show that the thermally induced 9c12c fatty acid undergoes isomerisation. The peak intensity at 969 cm-1 due to =CH trans bending vibration increased with heating time while the peak intensity at 3004 cm -1 due to =CH cis stretching vibration decreased indicating the isomerisation of 9c12c fatty acid. The identification and quantification of 9c12t, 9t12c and 9t12t isomers were carried out by GC and used in the determination of kinetic parameters for the isomerisation reaction. The results of the isomerisation show that the formation of 9c12t and 9t12c are equally probable during thermal induction. Furthermore, the isomerisation reaction followed a first order reaction with an activation energy of 39.00 ± 1.00 kcal mol -1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.aensiweb.net/AENSIWEB/anas/anas/2016/April/168-176.pdf |
| Alternate Webpage(s) | https://brage.bibsys.no/xmlui/bitstream/handle/11250/2419397/Thermally+Induced+Cis-Trans+Isomerisation.pdf?isAllowed=y&sequence=3 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
