Abstract
1. Etiolated seedlings of alfalfa and cucumber evolved n-hexanal from linoleic acid and cis-3-hexenal and trans-2-hexenal from linolenic acid when they were homogenized.2. The activities for n-hexanal formation from linoleic acid, lipoxygenase and hydro-peroxide lyase were maximum in dry seeds and 1~2 day-old etiolated seedlings of alfalfa, and in 6~7 day-old etiolated seedlings of cucumber.3. n-Hexanal was produced from linoleic acid and 13-hydroperoxylinoleic acid by the crude extracts of etiolated alfalfa and cucumber seedlings. cis-3-Hexenal and trans-2-hexenal were produced from linolenic acid and 13-hydroperoxylinolenic acid by the crude extracts of etiolated alfalfa and cucumber seedlings. But these extracts, particulariy cucumber one, showed a high isomerizing activity from cis-3-hexenal to trans-2-hexenal.4. When the C8-aldehydes were produced from linoleic acid and linolenic acid by the crude extracts, formation of hydroperoxides of these C18-fatty acids was observed.5. When 9-hydroperoxylinolei...
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