Preparation of a sulfated exopolysaccharide (S-EPS) from Ophiocordyceps sinensis fungus and its antioxidant effects - Tran, Trang; Nguyen, Phuong; Nguyen, Lai; Le, Hang; Huynh, Thu; Dinh, Hiep (VNUHCM Journal of Advanced Research in Natural Sciences, 2019)