EPS was isolated from fermentation media of a Cordyceps sinensis fungus (Cs-HK1).
EPS was nearly composed of d-glucose excluding a trace amount of d-mannose.
EPS consisted of (1→3)-β-glucan backbone with single (1→6)-β-glucose as side chain.
EPS showed a comb-like structure with (1→6)-β-glucose branch on every three glucoses.
EPS could improve the levels of TNF-α and INF-γ to enhance immunomodulatory ability.