What is "isomaltase"

n. (context enzyme English) An enzyme that catalyzes the hydrolysis of isomaltose and related dextrins

Isomaltase is an enzyme that breaks the bonds linking saccharides, which cannot be broken by amylase or maltase. It digests polysaccharides at the alpha 1-6 linkages. Its substrate, alpha-limit dextrin, is a product of amylopectin digestion that retains its 1-6 linkage (its alpha 1-4 linkages having already been broken down by amylase). The product of the enzymatic digestion of alpha-limit dextrin by isomaltase is maltose.

Isomaltase helps amylase to digest alpha-limit dextrin to produce maltose.