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Plant mucilages 29. isolation and characterization of a mucous poly saccharide plantago mucilage a from the seeds of plantago major var asiatica



Plant mucilages 29. isolation and characterization of a mucous poly saccharide plantago mucilage a from the seeds of plantago major var asiatica



Chemical and Pharmaceutical Bulletin 29(10): 2877-2884



A representative mucous polysaccharide, named Plantago-mucilage A, was isolated from the seeds of P. major L. var. asiatica Decaisne (= P. asiatica L.). The final preparation was homogeneous as determined by ultracentrifugal analysis, glass-fiber electrophoresis and gel chromatography. It was readily soluble in water and its solution gave an intrinsic viscosity value of 39.5. It was composed of L-arabinose, D-xylose, D-glucuronic acid and D-galacturonic acid in the molar ratio of 4.0:10.8:3.3:0.7, and its MW was estimated to about 1,500,000. O-Acetyl groups were identified in it and their content amounted to 4.8%. Reduction of carboxyl groups, methylation analysis, controlled Smith degradation and partial acid hydrolysis studies showed that the mucilage possesses a main chain composed of .beta.-1 .fwdarw. 4 linked D-xylopyranose residues having other D-xylopyranose side chains at position 3 and branches composed of O-.alpha.-(D-glucopyranosyluronic acid)-(1 .fwdarw. 3)-.alpha.-L-arabinofuranose and of O-.alpha.-(D-galactopyranosyluronic acid)-(1 .fwdarw. 3)-.alpha.-L-arabinofuranose at position 2 of the residual D-xylopyranose units.

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