A novel polysaccharide (GCPB-1b) was isolated from Boshuzhi, Ganoderma capense.
10">The structural characterization of GCPB-1b was studied and confirmed.
15">The polysaccharide GCPB-1b had good DPPH radical-scavenging capacity.
20">GCPB-1b isolated from Ganoderma capense is a promising antioxidant.