The structure of the plasmalogens of ox heart

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Abstract
The lysolecithin derived from the choline plasmalogen of ox heart by removal of the aldehyde residue was identified as the [alpha]-acyl isomer by oxidation with permanganate and identification of the acid hydrolysis products. The lysokephalin similarly derived from kephalin plasmalogen was identified as [alpha]-acyl-lysokephalin. The aldehyde residue in the plasmalogens of ox heart is therefore linked to the [beta]-carbon atom of the glycerol moiety. The aldehydes isolated from the choline plasmalogen were mainly saturated, the major component being palmitaldehyde. The fatty acids present in choline and ethanolamine plasmalogen were mainly (95%) unsaturated acids. The composition of the unsaturated fatty acids of the plasmalogens and of the kephalin and lecithin of ox heart was examined by alkali isomerization. The ethanolamine phosphatides were more highly unsaturated than the choline phosphatides, and contained large amounts of C20-22 polyenoic acids.