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Abstract
An extracellular polysaccharide (I) was isolated from the viscous culture filtrate of S. libertiana and subjected to methylation study, enzymic hydrolysis and Smith degradation. From the results, I was concluded to be a polysaccharide composed of a backbone of β-(1 → 3)-linked d-glucopyranosyl residues and possessed a single β-d-glucopyranosyl residue joined through C-6 of every third d-glucopyranosyl residue of the backbone.