1-Deoxymannojirimycin hydrochloride is widely used in biochemical research as a potent inhibitor of alpha-mannosidase enzymes. It plays a crucial role in studying glycoprotein processing and glycosylation pathways, helping researchers understand diseases related to improper protein glycosylation, such as certain cancers and lysosomal storage disorders. Additionally, it is utilized in the development of antiviral agents, particularly against viruses like HIV and hepatitis, where glycosylation is essential for viral replication. Its ability to interfere with glycoprotein maturation makes it a valuable tool in both therapeutic and diagnostic applications.