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| - Ferulic Acid Crosslinks in Asparagus Cell Walls in Relation toTexture
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| - Post-harvest toughening of asparagus spears is associated with a large increase in monomeric anddiferulic acids in the cell walls of stem tissues. The purpose of this study has been to investigate thedistribution of these phenolic components among cell wall polymers and the role they play in theformation of associated pectic−xylan−phenolic complexes in relation to post-harvest toughening.The phenolic esters are found in all the extractable polysaccharide fractions, particularly the 0.5 MKOH fraction, as well as the insoluble cellulose-rich residue. The storage-related increase occurs inall fractions but is most prominent in the 0.5 M KOH-soluble components. Degradation of 0.5 M KOHsubfractions with pure polysaccharide degrading enzymes has confirmed the occurrence of pectic-xylan-phenolic complexes in which ferulic acid and its dehydrodimers are attached to the xylancomponent but not to the pectic component. Studies on cell separation show that the maturation-and storage-related increase in thermal stability of cell adhesion (and therefore texture) is probablydue to an increase in phenolic cross linking of xylans mainly in the parenchyma tissues. Thisovercomes the thermal lability of the pectic polysaccharides that are responsible for cell adhesion inimmature tissues. The storage-induced appearance of some of the diferulic acid moieties in a numberof wall polymer fractions supports the hypothesis that the storage affect is a wound-induced responserather than a continuation of maturation-related activity. Keywords: Asparagus; cell wall complexes; storage; texture
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