| Abstrakt: |
Zeroth and second order derivative UV spectra of some lipids and model substances having a conjugated system of double bonds were recorded. The second derivative spectra showed fine spectral structures with at least three negative peaks. The wavelengths of their minima are different for trans, trans and cis,trans geometric isomers, which allowed determination of each individual isomer in a mixture without any separation. The derivative spectra of 2,4-hexadienes, some acetyl esters of unsaturated fatty alcohols and autoxidized linoleic acid, soybean oil and soybean lecithin are discussed. [ABSTRACT FROM AUTHOR] |
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