Abstract
The occurrence of ether-linked ferulic acid amides (feruloyltyramine and/or feruloyloctopamine) in suberin-enriched samples of natural and wound periderms of potato tubers was established by thioacidolysis and desulphuration, followed by GC-mass spectrometry of diagnostic dihydroferuloyltyramine. Analysis of samples premethylated in the presence of diazomethane showed that the major part of the ether bonds involved the ferulic moiety of the amides; 20% of the amides released upon thioacidolysis were nevertheless attached to cell walls through the tyramine phenolic group. In addition, dicovalently linked ferulic acid amides were evidenced. These bridges were twice as abundant in the wound than in the natural periderm.
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