An identical polysaccharide HPB-3 was isolated from H. erinaceus fruiting body at the different maturating-stage.
The molecular weight of HPB-3 is 1.5 × 104 Da.
HPB-3 containes a α-(1/6)-linked galactopyranosyl backbone, and a side chain of α-L-fucopyranose.
HPB-3 exhibited higher macrophages stimulation activities.