Abstract
A galactomannan composed of d-galactose (1 mol) and d-mannose (2 mol) was isolated from the seed of Delonix regia. Hydrolysis of methylated galactomannan yielded 2,3,4,6-tetra- O-methyl- d-galactose (1·02 mol), 2,3,6-tri- O-methyl- d-mannose (1·05 mol) and 2,3-di- O-methyl- d-mannose (1 mol). The periodate consumption was 1·30 mol for each hexose unit with concomitant liberation of 0·31 mol of formic acid. Hydrolysis of the reduced oxopolysaccharide gave only glycerol (1 mol) and erythritol (1·04 mol). It is established that galactomannan is a highly branched polysaccharide consisting of the main chain of mannose united linked through β (1→4) and side chain of single galactose units linked through α (1→6).
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