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At least 757 records · Page 42Linked to original sources
PubMed1976

The formation of cis-3-nonenal, trans-2-nonenal and hexanal from linoleic acid hydroperoxide isomers by a hydroperoxide cleavage enzyme system in cucumber (Cucumis sativus) fruits.

1. A particulate enzyme fraction and an acetone powder preparation from cucumber fruits cleaved 9- and 13-hydroperoxyoctadecadienoic acids to form volatile aldehydes and oxoacid fragments. 2. From the 9-hydroperoxide, the major volatile fragments were cis-3-nonenal and trans-2-nonenal using particulate enzyme and acetone powder preparations, respectively. 3. Hexanal was the only significant volatile fragment from the 13-hydroperoxide. 4. The particulate enzyme system was equally effective on both 9- and 13-hydroperoxide isomers and was fully active under anaerobic conditions and at pH 6.4. 5. An enzymic pathway for the biogenesis of hexanal, cis-3- and trans-2-nonenal (components of the characteristic flavour volatiles of cucumber) from linoleic acid is proposed. This involves the sequential activity of lipoxygenase, hydroperoxide cleavage and cis-3-: trans-2-enal isomerase enzymes.

Aldehydes↗
PubMed1976

Synthesis of anacardic acids in seeds of Ginkgo biloba.

Anacardic (6-alkylsalicylic) acids and common lipids are efficiently synthesized by immature seeds of Ginkgo biloba. The seeds were incubated with 14C-labeled acetic, malonic and palmitoleic acids, glucose, and other potential precursors. Levels of 14C in common lipids and in anacardic acids, and the distribution of 14C in anacardic acids were determined. The results show that the salicylic moiety is synthesized by a polyketide pathway via malonic acid. The chain moiety for anacardic acid synthesis is in a different state of activation and/or site than chains that are used for synthesis of the common lipids. Labeled shikimic acid did not contribute 14C to anacardic acids, nor to other lipids, and palmitoleic acid was incorporated only into common lipids.

Acetates↗