A glucomannan isolated from konjac flour was hydrolyzed with commercially available crude and purified cellulases. The following oligosaccharides were isolated from the hydrolyzate and identified: (a) 4-O-β-D-mannopyranosyl-D-monnose (b) 4-O-β-D-mannopyranosyl-D-glucose (c) O-β-D-mannopyranosyl-(1→4)-O-beta;-D-mannopyranosyl-(1→4)-D-mannose (d) O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-D-glucose (e) O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-D-mannose (f) O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-D-glucose (g) O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-O-β-D-mannopyranosyl-(1→4)-D-glucose (h) 4-O-β-D-glucopyranosyl-D-glucose(cellobiose) (i) 4-O-β-D-glucopyranosyl-D-mannose (epicellobiose) (j) O-β-D-glucopyranosyl-(1→4)-O-β-D-mannopyranosyl-(l→4)-D-mannose. Of these saccharides, (h), (i) and (j) were isolated from the hydrolyzate by purified cellulase, while (g) was isolated from the hydrolyzate by crude cellulase. The others were all present in the hydrolyzates both by crude and by purified cellulases.

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