Abstract
Cutin, the lipid polymer of plant cuticle, when treated with LiAlH 4 in tetrahydrofuran gave better than 95% conversion into reduced monomers which were separated by thin-layer chromatography into fatty alcohols, alkanediols, alkanetriols and alkanetetraols. The major component from Vicia faba leaf cutin was identified by TLC, GLC, NMR, IR and mass spectrometry to be hexadecan-1,7, 16-triol, most probably derived from 10, 16-dihydroxy palmitic acid of the cutin. Palmitic acid-1- 14C was readily incorporated into this component and lesser amounts into monohydroxy acids and fatty acids of the cutin. Experimental evidence suggests the reaction sequence palmitic acid → 16-hydroxy palmitic acid → 10, 16-dihydroxy-palmitic acid → cutin. Palmitoleic acid-10- 14C was not incorporated into dihydroxy palmitic acid suggesting the noninvolvement of epoxide intermediate. Acetate-1- 14C, oleic acid-1- 14C and stearate-1- 14C also labeled the cutin.
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