Abstract
Peroxidation of lipids produces carbonyl compounds; some of these, e.g., malonaldehyde and 4-hydroxynonenal, are genotoxic because of their reactivity with biological nucleophiles. Analysis of the reactive carbonyl compounds is often difficult. The methylhydrazine method developed for malonaldehyde analysis was applied to simultaneously measure the products formed from linoleic acid, linolenic acid, arachidonic acid, and squalene upon ultraviolet-irradiation (UV-irradiation). The photoreaction products, saturated monocarbonyl, α,β-unsaturated carbonyls, and β-dicarbonyls, were derivatized with methylhydrazine to give hydrazones, pyrazolines, and pyrazoles, respectively. The derivatives were analyzed by gas chromatography and gas chromatography-mass spectrometry. Lipid peroxidation products identified included formaldehyde, acetaldehyde, acrolein, malonaldehyde, n-hexanal, and 4-hydroxy-2-nonenal. Malonaldehyde levels formed upon 4 hr of irradiation were 0.06 μg/mg from squalene, 2.4 μg/mg from linolenic acid, and 5.7 μg/mg from arachidonic acid. Significant levels of acrolein (2.5 μg/mg) and 4-hydroxy-2-nonenal (0.17 μg/mg) were also produced from arachidonic acid upon 4 hr irradiation.
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Abbreviations
- GC:
-
gas chromatography
- HPLC:
-
high performance liquid chromatography
- NPD:
-
nitrogen-phosphorus detector
- MS:
-
mass spectrometry
- UV:
-
ultraviolet
- FT-IR:
-
Fourier transform infrared spectroscopy
- FT-NMR:
-
Fourier transform nuclear magnetic resonance
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Dennis, K.J., Shibamoto, T. Gas chromatographic analysis of reactive carbonyl compounds formed from lipids upon UV-irradiation. Lipids 25, 460–464 (1990). https://doi.org/10.1007/BF02538089
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DOI: https://doi.org/10.1007/BF02538089