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.
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Alberto Lezerovich (1986) studied this question.
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