Abstract
A pectin isolated from rapeseed, hulls by extraction with aqueous ammonium oxalate, had a degree of esterification of 83% and contained residues of hexuronic (mainly D-galacturonic) acid (76%), D-galactose (2–3%), L-arabinose (8–9%), D-xylose (2%), L-rhamnose (2–3%), and L-fucose (1%). Partial acid hydrolysis of the derived pectic acid furnished 2- O-(α- D-galactopyranosyluronic acid)- L-rhamnose, 4- O-(α- D-galactopyranosyluronic acid)- D-galacturonic acid and the polymer-homologous tri- and tetrasaccharides, and 4- O-(glucopyranosyluronic acid)- L-fucose. The cleavage products from the methylated pectin were examined by g.l.c. and the partially methylated alditol acetates from the methylated carboxyl-reduced polysaccharide by g.l.c.-mass spectrometry. Parallel methylation studies on lemon-peel pectin have established a close similarity between the two pectins.
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