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Studies on seed mucilages. III. Examination of a polysaccharide extracted from the seeds of Plantago ovata Forsk

Studies on seed mucilages. III. Examination of a polysaccharide extracted from the seeds of Plantago ovata Forsk

Jour Chem Soc [london] (6): 1600-1607

Extraction of psyllium seeds with cold water yielded a polysaccharide (PI) of equivalent approx. 700, giving on analysis uronic anhydride (20%), pentosan (52%), and methylpentosan (18%). Further extraction with hot water gave PII, equivalent to approx. 4000, containing approx. 3% of uronic anhydride. Hydrolysis of PI gave D.xylose (approx. 46%), L-arabinose (approx. 7%), and an aldobiuronic acid (40%) shown to be 2-D-galacturonosido-L-rhamnose, and an insoluble residue (2%). From PII, L-arabinose (approx. 14%) and D-xylose (approx.80%) were isolated, along with an insoluble residue (3%). Acetylation, followed by deacetylation and methylation of PI and subsequent fractional precipitation, gave materials A (82%) and B (18%). Methanolysis of A yielded trim ethyl methyl-D-xylopyranosides (6 parts), trimethyl methyl-L-arabofuranosides (1 part), 2,4-dimethyl methyl-D-xylopyranosides (1 part), 3-methyl methyl-O-xylopyranosides (4 parts), 2-methyl methyl-D-xylopyranosides (1 part), and methyl-D-xylopyranosides (2 parts). B gave similar fractions, except that double the proportion of 2,4-di-methyl methyl-D-xylosides was present at the expense of mono-methyl methyl-D-xylosides. The aldobiuronic acid is probably a component of a polyuronide associated with a neutral polysaccharide rather than an integral part of a single acidic polysaccharide.

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