Abstract

Abstract Pectins from different tissue zones, namely epidermis, the outer parenchyma, the parenchyma of the carpels zone, the carpels and the core line, were isolated from alcohol-insoluble solids (AIS. In both zones of parenchyma, the cell-wall material represented about 80% of the total cell-wall material from the whole fruit. The pectins from the outer parenchyma accounted for 70% of the total. However, there was no change in galacturonic acid concentration. The enzymatic solubilisation of tissues or AIS was higher in the parenchyma zones than in the others. Nevertheless, the depolymerisation of the soluble pectins from parenchyma zones with an endopolygacturonase required the action of pectin methylesterase. The depolymerisation of pectins from the other zones, however, did not.

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