Dextran T2 (Dextran 2; Dextran T2(MW 1600-2400)) is a natural high molecular weight polysaccharide, the glycosidic bonds in its structure can be recognized by endo-dextranase and exo-dextranase. Dextran T2 (MW 2,000) breaks the glycosidic bonds in the enzymatic hydrolysis mechanism, releasing products such as D-glucose, Isomaltose (IM2), and Isomaltotriose (IM3). Dextran T2 (MW 2,000) can be used as a model substrate to characterize the catalytic properties of dextranase (such as optimal pH, temperature and product specificity), and to study enzymatic mechanism research and polysaccharide degradation pathways in glycobiology. The Dextran series of compounds are also a natural polysaccharide drug carrier, which can be connected to drugs through covalent bonding methods such as ester bonds, amide bonds or click chemistry, or self-assembled to form carriers such as nanoparticles and hydrogels. Dextran is biodegradable and biocompatible, and can achieve targeted delivery and controlled release of drugs. Dextran derivatives can prolong drug half-life, increase local concentration and reduce immune clearance activity.