Hydrolysis Products of Periodate-Oxidized Phosphomannan Y-2448

Sequences of at least three α-1,3-linked mannose units have been shown to occur in phosphomannan Y-2448 through isolation of 3-O-[3-O-(α-D-mannopyranosyl)-α-D-mannopyranosyl]-D-mannose from partial acid hydrolyzates of both the native and the periodateoxidized phosphomannan. 3-O-(α-D-Mannopyranosyl)-D-mannose has been obtained also. The mannosidic bond in these oligosaccharides appears to be more stable to acid hydrolysis than that by which the mannose 6-phosphate unit is held in this macromolecular polysaccharide derivative. It has been established that the D-mannose 6-phosphate unit is oxidized by periodate and that orthophosphate is the form which occurs in this phosphomannan.