screened against a panel of β-N-acetylhexosaminidases (extracellular and intracellular) from various sources (fungal, human, animal, plant and bacterial) for hydrolysis. The results of this screening are reported here, as well as the structures of three novel 4′-deoxy-disaccharides prepared by transglycosylation reaction with high yields (52% total disaccharide fraction) using β-N-acetylhexosaminidase