Abstract
The capsular polysaccharide of Streptococcus pneumoniae serotype 6B [->2)-α-D-Galp-(1->3)-α-D-Glcp-(1->3)-α-L-Rhap-(1->4)-D-RibOH-(5-P->n was depolymerised under alkaline (NaOH) and acidic (HF) conditions. The former treatment yielded, as the major component, α-2-P-Galp-(1->3)-α-Glcp-(1->3)-α-Rhap-(1->4)-5-P-RibOH. The latter treatment at −16o gave α-Galp-(1->3)-α-Glcp-(1->3)-α-Rhap-(1->4)-RibOH-(5-P->2)-α-Galp-(1->3)-α-Glcp-(1->3)-α-Rhap-(1->4)-RibOH and at 4o gave α-Galp-(1->3)-α-Glcp-(1->3)-α-Rhap-(1->4)-RibOH. These oligosaccharides were characterised by sugar analysis, f.a.b.-m.s., and 1H- and
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