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The novel pathways of oleic acid formation from cis-vaccenic (cis-11-octadecenoic) acid and of cis-vaccenic acid formation from oleic acid by enzymatic positional isomerization have been proposed in higher plants, based on stable-isotope experiments using [2,2-2H2]cis-vaccenate or [2,2-2H2]oleate as an immediate precursor. A pulp homogenate and also pulp slices prepared from developing kaki (Diospyros kaki) fruit could catalyze these hitherto unknown isomerizations. This suggests the presence of a new type of isomerase responsible for the double-bond shifting reaction without cis-trans isomerization in the middle of fatty acid carbon chains.
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SHIBAHARA et al. (1990) studied this question.
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