Deoxynojirimycin is a Maltase-glucoamylase (α-glucosidase I and II) inhibitor. Interferes with N-linked glycosylation. Reported to inhibit trimming of oligosaccharides upon treatment of secretory glycoprotein IgD- and IgM-producing cells. Reported to inhibit secretion of IgD. Deoxynojirimycin is an inhibitor of β-glucosidase and Maltase-glucoamylase.