Structural elucidation of the exopolysaccharide produced by fungus Fusarium oxysporum Y24-2

The extracellular polysaccharide FO1 was isolated from the fermentation broth of an endophytic fungus (Fusarium oxysporum) of Ipomoea pes-caprae. Its structural characteristics were studied by chemical and methylation analyses, and 1D and 2D 1H and 13C NMR spectroscopy. Results indicated that this exopolysaccharide consists of a disaccharide repeating unit with the following structure (n ≈ 111):   [→2)-β-d-Galf(1→6)-α-d-Glcp(1→]n

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► An exopolysaccharide FO1 consisted of a repeating unit is described.
► The repeating unit consists of [→2)-β-d-Galf(1→] and [1→6)-α-d-Glup(1→].
► This is the first time to report such kind of polysaccharide from Fusarium oxysporum.