Zur Bildung von Ketonen und Aldehyden während der Oxydation gesättigter Triglyceride bei hohen Temperaturen

[Investigations on the influence of insecticides on autoxidation processes. X. Formation of peroxides from octadecenic acid methylester in the presence of water and chlorinated hydrocarbon insecticides (author's transl)]

According to the range DDT less than DDE less than heptachlor less than heptachlorepoxide, chlorinated hydrocarbon insecticides promote the formation of peroxides from cis- and trans-9-octadecenic acid methylesters within the lipid and the water phase of the investigated model system. Compared with DDT and heptachlor the metabolites DDE and heptachlorepoxide proof as more efficient prooxidants; this may be explained by their higher reactivity. According with these observations the amount of insecticides, especially of heptachlor and heptachlorepoxide, that can be extracted from the model system with petroleumether after 72 hrs of autoxidation is markedly diminished. From that it is concluded, that in the investigated lipid-water-system the insecticides not only have a catalytic effect, but also are in part immediately involved in the formation of peroxides from 9-octadecenic acid methyl ester.

[Investigations on the influence of insecticides on autoxidation processes. XI. Formation of secondary metabolites from octadecenic acid methyl ester in the presence of water and chlorinated hydrocarbon insecticides (author's transl)]

For determining the influence of chlorinated hydrocarbon insecticides on the formation of secondary metabolites from peroxidized 9-octadecenic acid methylester by autoxidation within 72 hrs, substances reacting with phosphomolybdanic acid have been separated by TLC. Furthermore the increase of metabolites containing carbonyl groups and the variation of the ratio of polar to unpolar OH-groups in the metabolites have been determined by IR-spectrophotometry. All results proved, that the trans-9-octedecenic acid ester is autoxidized more rapidly than the cis-ester. Moreover the insecticides principally favour the formation of secondary metabolites from the lipidperoxide. This effect increases in the range DDT, DDE, heptachlor, heptachlorepoxide. If the increase of metabolites with carbonyl groups is chosen as a measure for the prooxidative effect, the effect appears equally high for the cis- and the trans-ester. But the hydroxyl index is changed depending on the kind of the insecticide added and the steric configuration of the lipid.