Abstract
A semi-micro quantitative method has been developed for the determination of double bond positions in unsaturated fatty acid methyl esters differing in position, number of double bonds and chain length. This method involves ozonolysis in methylene chloride in the presence of 1,3-propanediol, reduction of the hydroperoxides with dimethyl sulfide and conversion of aldehyde and aldester fragments to stable dioxanes, followed by gas chromatographic analysis under programmed temperature. Propanediol acts as a proton donor for the generation of hydroperoxides as well as a reactant for the formation of dioxanes. All the steps are carried out in a culture tube without any transfers. The absence of unoxidized ester and unreduced hydroperoxide or ozonide has been shown by thin layer chromatography. The method has been tested with pure esters and their binary mixtures. Experimental values for mole percentage composition in the mixtures agreed with the actual values. This method enabled us to isolate and estimate malondialdehyde for the first time as a stable bis-dioxane derivative.
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Lakshminarayana, G., Cornwell, D.G. Localization of fatty acid double bonds by gas chromatography of intermediate aldehydes as 1,3-dioxane. Lipids 21, 175–177 (1986). https://doi.org/10.1007/BF02534442
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DOI: https://doi.org/10.1007/BF02534442