Abstract
Schizolobium amazonicum and S. parahybae galactomannans yielded the same pattern of oligosaccharides on partial acid hydrolysis. Seed coats of both species furnished unusual linear arabinans providing chemotyping evidence supporting the suggestion that they are not different species. Schizolobium parahybae and S. amazonicum seeds yielded galactomannans with identical 3.0:1 Man:Gal ratios and with the same d-galactose distribution along the main chain. Although the galactomannan from seeds of Cassia fastuosa showed the same Man:Gal ratio, its fine structure differed significantly from that of the two Schizolobium species as shown by the analysis of oligosaccharides (DP 2 to 6) obtained by partial acid hydrolysis. Seed coasts of S. parahybae and S. amazonicum furnished similar unusual neutral linear α- l-arabinofuranan (1 → 5) linked, as determined by methylation analysis, optical rotation and 13C NMR spectroscopy. On the other hand, C. fastuosa seed coats furnished two acidic arabinans. These results in terms of using galactomannans and arabinans in chemotyping, support the suggestion of Rizzini that S. parahybae and S. amazonicum are not different species.
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