Konjac mannan consumed 0.991 moles of sodium metaperiodate per anhydrohexose residue. The Smith degradation of this glucomannan produced large amounts of glycolaldehyde and erythritol, in addition to small amounts of D-mannose, D-glucose and glycerol. Complete acid-hydrolysis of the glucomannan yielded n-mannose and D-glucose in a molar ratio of 1.6:1.00 or 8:5. The hydrolysate of konjac glucomannan by β-mannanase preparation from konjac tubers yielded a mixture of oligosaccharide, from which the following compounds were isolated and identified: (1) M→M, (2) G→M, (3) G→G, (4) M→M→M, (5) G→M→M, (6) M→G→M, (7) G→G→M, (8) M→M→M→M, (9) G→M→M→M, (10) G→M→M→G, (11) G→G→M→M, (12) M→M→M→M→M, (13) G→M→M→M→M. On the basis of the above results, the possible structures of this glucomannan and the specificities of β-mannanase were discussed.

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