Fatty acids. II. The synthesis and gas-liquid chromatographic behaviour of five trimethylene-interrupted C18-diunsaturated fatty acids

Computer processing of fatty acid analysis data

A Fortran computer program for the processing of fatty acid data from the anlysis of fats and oils by gas-liquid chromatography is described. The analytical method and calculations are described primarily for the analysis of butterfat and margaine fat, but with minor changes could be adapted to suit other fats and oils. The program computes the concentration of each fatty acid as weight % and mole %, the percentage glycerol, the theoretical iodine value, and other relevant combinations of fatty acids.

Fatty acids, Part X. Raman spectra of all dimethylene interrupted methyl cis, cis-octadecadienoates and octadecadiynoates

The Raman spectra of all the dimethylene interrupted methyl cis, cis-octadecadienoates and octadecadiyonates have been studied. The Raman band positions and their relative intensities for the v(C=C),v(C=C),v(C-H) and beta (CH2) modes are recorded. The height intensity of the bands arising from v(C=C) relative to v(C=O) provides a means of determining the number of cis-ethylenic bonds in a mono-ester. In the acetylenic series, the intensity of the bands arising from v(C=C) relative to v(C=O) failed to indicate with certainty the number of acetylenic bonds in the mono-esters studied, due to the weak intensity of the band due to v(C=O). However a better correlation between the relative intensities of the v(C=C) and beta (CH2) bands is established instead. An attempt to correlate the areas under the bands due to v(C=C), (C=C), (C=O) and beta (CH2) failed to produce any significant results. The Raman spectra of the methyl octadec-cis-10-en-5-ynoate and methyl octadeca-5, 10-diynoate are also recorded.