In the previous paper, authors identified the volatile carbonyl compounds evolved from rape-seed oil by the oxidation with dried air.
In this paper, methyl eruciate was synthesized from erucic acid which is the main component of fatty acids in rape-seed oil, and was oxidized with dried air at 96±1°C, according to the procedure previously described.
The volatile carbonyl compounds come from methyl eruciate in each oxidation period were identified by means of paper chromatography and ultra-violet absorption spectra.
Experimental results were as follows :
1) The carbonyl compounds from methyl eruciate were mostly evolved in the oxidation periods from 36 to 48 hours and most part of that was carbonyl compounds having C
10 to C
14 carbon number.
2) With the progress of oxidation, the proportion of saturated carbonyl compounds in the fraction having C
2C
4 and C
6C
8 carbon number increased, while in carbonyl compounds having C
10 to C
14 fraction, the proportion of unsaturated carbonyl compounds were increased after the oxidation period of 36 hours.
3) A small amount of aliphatic ketones appeared simultaneously during oxidation, and it was 8% by weight for the interval of 24 to 36 hours oxidation.
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