α-dex·trin·ase (dekґstrin-ās) an enzyme that catalyzes the hydrolysis of both α-1,6 and α-1,4 bonds in linear and branched oligoglucosides and maltose and isomaltose. It occurs on the brush border of the intestinal mucosa, completes the digestion of starch or glycogen to glucose, and is present as a complex with sucrase; absence of the enzyme complex activity, called sucrase-isomaltase deficiency, is a form of disaccharide intolerance. Called also isomaltase and limit dextrinase. In EC nomenclature called oligo-1,6-glucosidase.

Medical dictionary. 2011.

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