Dextran 1,6-ñ-isomaltotriosidase (, exo-isomaltotriohydrolase, 1,6-ñ-<small>D</small>-glucan isomaltotriohydrolase) is an enzyme with systematic name 6-ñ-<small>D</small>-glucan isomaltotriohydrolase. This enzyme catalyses the hydrolysis of (1âÂÂ6)-ñ-<small>D</small>-glucosidic linkages in dextrans, to remove successive isomaltotriose units from the non-reducing ends of the chains.