Three glucose units in maltotriose are connected by an α-1,4 glycosidic bond, whereas consecutive maltotriose units are connected to each other by an α-1,6 glycosidic bond.

The presence of this polysaccharide also facilitates diffusion of molecules both into and out of the cell.

[1] As an edible, mostly tasteless polymer, the chief commercial use of pullulan is in the manufacture of edible films that are used in various breath freshener or oral hygiene products such as Listerine Cool Mint of Johnson and Johnson (USA) and Meltz Super Thin Mints of Avery Bio-Tech Private Ltd. (India).

Pullulan and HPMC can also be used as a vegetarian substitute for drug capsules, rather than gelatine.

Pullulan has also be explored as natural polymeric biomaterials to fabricated injectable scaffold for bone tissue engineering,[2] cartilage tissue engineering,[3] and intervertebral disc regeneration.