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Differences in poly isoprenoid alcohols of monocotyledonous and dicotyledonous seeds

Differences in poly isoprenoid alcohols of monocotyledonous and dicotyledonous seeds

Lipids 19(6): 401-404

A lipid fraction enriched in polyisoprenoid alcohols was prepared from seeds of a number of crop plants, using Florisil chromatography. Analysis by HPLC [high performance liquid chromatography] of the fraction from soybeans showed a series of peaks corresponding to .alpha.-saturated homologues (dolichols) from 15-22 isoprene units in length. Similar results were obtained with seeds of other dicotyledonous species (rapeseed, peanuts, mung beans, navy beans and peas). Analysis of the seeds of monocotyledonous plants (wheat, rye, barley, rice and corn) by HPLC gave split peaks, indicating the presence of nearly equal amounts of 2 different homologous series of compounds. The polyisoprenoid material isolated from wheat germ was subsequently shown to consist of a mixture of dolichols and .alpha.-unsaturated homologs (polyprenols). Treatment with MnO2 selectively oxidized the polyprenols to the corresponding aldehydes, which were separated from the dolichols by TLC. The identity of the components was established by IR-NMR spectroscopy and by comparison with authentic standards on HPLC. The concentration of polyisoprenoid alcohols in seeds varied from 1-16 mg/100 g. Seeds of different species showed some differences in the pattern of homologues present.

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