Isolation and structural characterization of the water-extractable polysaccharides from Cassia obtusifolia seeds

► Three polysaccharides were isolated from whole seeds of Cassia obtusifolia. ► They were fractionated by Fehling solution complexing and chromatographic methods. ► CFAA-1 and CFAA-3 were elucidated to be both typical branched galactomannans. ► CFBB2 was shown to be a linear (1 → 4)-α-polygalacturonic acid.