Preparation and characterization of an extracellular polysaccharide produced by the deep-sea fungus Penicillium griseofulvum

► Exopolysaccharide Ps1-1 was prepared from Penicillium griseofulvum. ► Ps1-1 consists of a long chain of galactofuranan and a mannose core. ► Galactofuranan chain contains galactofuranose residues with phosphate esters. ► Mannose core is composed of mannopyranose residues with branches. ► Ps1-1 appears to be a galactomannan different from previously described exopolysaccharides.