Add time:09/07/2019         Source:sciencedirect.com

An acetalation-acid decomposition procedure was developed to investigate the formation of malonaldehyde from a wide assortment of primary and secondary lipid oxidation products. The formation of malonaldehyde as the tetramethyl acetal derivative was determined quantitatively by gas chromatography with an internal standard technique and identified by gas chromatography-mass spectrometry. Five-membered hydroperoxy epidioxides and 1, 3-dihydroperoxides were found to be the most important precursors of malonaldehyde. 1, 4-Dihydroperoxides were less important, and monohydroperoxides were the least significant sources of malonaldehyde. No malonaldehyde was produced from either a six-membered hydroperoxy epidioxide or 1,7-and 1,8-dihydroperoxides. No correlation was found between the thiobarbituric acid values of the lipid oxidation products and analyses of malonaldehyde by the acetalation-acid decomposition procedure. By the specific methodology presented in this paper, the potential of lipid oxidation products to form malonaldehyde and its biological effect due to crosslinking can better be evaluated than the extensively used thiobarbituric acid test, which is not specific for most of the oxidation lipid products examined in this study.

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