Abstract
The structures of four oligosaccharides, isolated from a partial acid-hydrolysate of the glycuronan “protuberic acid” (PA), have been examined by chemical analysis, and by 1H- and 13C-n.m.r. spectroscopy. They were identified as O-(β- d-glucopyranosyluronic acid)-(1 →4)- d-glucuronic acid, O-(α- l-idopyranosyluronic acid)-(1 →4)- d-glucuronic acid, O-(β- d-glucopyranosyluronic acid)-(1 →4)- O-(α- l-idopyranosyluronic acid)-(1 →4)- d-glucuronic acid, and O-(β- d-glucopyranosyluronic acid)-(1 →4)- O-(β- d-glucopyranosyluronic acid)-(1 →4)- O-(α- l-idopyranosyluronic acid)-(1 →4)- d-glucuronic acid. The acid-resistant portion of PA had properties similar to those of the original PA. These results suggested that the linear structural-sequence of PA is derived from the trisaccharide repeating-unit [ →4)-β- d-GlcA-(1 →4)-α- l-IdoA-(1 →4)-β- d-GlcA-(1 →].
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