Glucan 1,3-alpha-glucosidase (EC 3.2.1.84, exo-1,3-alpha-glucanase, glucosidase II, 1,3-alpha-D-glucan 3-glucohydrolase) is an enzyme with systematic name 3-alpha-D-glucan 3-glucohydrolase. This enzyme catalyses the following chemical reaction Glucan 1,3-alpha-glucosidase (EC 3.2.1.84, exo-1,3-alpha-glucanase, glucosidase II, 1,3-alpha-D-glucan 3-glucohydrolase) is an enzyme with systematic name 3-alpha-D-glucan 3-glucohydrolase. This enzyme catalyses the following chemical reaction This enzyme does not act on nigeran although it has some activity against nigerose.