Levan

(→6)-ß-D-fructofuranose(2→). Linkage distribution: grasses and cereals: mainly linear. Bacteria: some branching (5%-20% [2,3]) (2→1), unit chain lenght ~12 [1]. Usually of relatively low molecular weight for grasses and cereals [1].

The molecule is globular [3], flexible and tend to be a left-hand twist [2].