Abstract
Six odor-active compounds generated by autoxidation of arachidonic acid (AA) were quantified by isotope dilution assay (IDA), i.e., hexanal (1), 1-octen-3-one (2), (E,Z)-2,4-decadienal (3), (E,E)-2,4-decadienal (4), trans-4,5-epoxy-(E)-2-decenal (5), and (E,Z,Z)-2,4,7-tridecatrienal (6). Compound 1 was the most abundant odorant with about 700 mg/100 g autoxidized AA, which corresponds to 2.2 mol% yield. Based on the odor activity values (ratio of concentration to odor threshold), odorants 3 (fatty) and 5 (metallic) showed the highest sensory contribution followed by 1 (green), 2 (mushroom-like), 6 (egg white-like), and 4 (fatty). For the first time, reliable quantitative results are reported for odorants 1–6 in autoxidized AA, in particular odorant 6, which is a characteristic compound found in autoxidized AA. Synthesis of deuterated 6, required for IDA, is described in detail. The formation of odorants 1–6 by autoxidation of AA is discussed with respect to the quantitative data.
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Abbreviations
- AA:
-
arachidonic acid
- CC:
-
column chromatography
- CI:
-
chemical ionization
- EI:
-
electron ionization
- GC:
-
gas chromatography
- GC-O:
-
gas chromatography-olfactometry
- HPET:
-
hydroperoxyeicosatrienoic acid
- HPETE:
-
hydroperoxyeicosatetraenoic acid
- HPOD:
-
hydroperoxyoctadecadienoic acid
- IDA:
-
isotope dilution assay
- IS:
-
internal standard
- MS:
-
mass spectrometry
- NMR:
-
nuclear magnetic resonance
- OAV:
-
odor activity value
- PCI:
-
positive chemical ionization
- RI:
-
retention index
- SIM:
-
selected ion monitoring
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Lin, J., Fay, L.B., Welti, D.H. et al. Quantification of key odorants formed by autoxidation of arachidonic acid using isotope dilution assay. Lipids 36, 749–756 (2001). https://doi.org/10.1007/s11745-001-0781-x
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DOI: https://doi.org/10.1007/s11745-001-0781-x