Structural, physical characteristics and biological activities assessment of scleroglucan from a local strain Athelia rolfsii TEMG

Athelia rolfsii TEMG (MH 236106) an exopolysaccharide (EPS) producing fungal strain was isolated and identified. Extraction, purification, characterization, antimicrobial, antioxidant, antiviral and antitumor activities of the polysaccharide were investigated. It characterized as a homopolysaccharide of glucose with a molecular weight of 345.622 kDa. The identification of the polysaccharide was conducted using scanning electron microscopy, energy dispersive X-ray analysis, H-1 and C-13 NMR spectra. The existence of beta-1,3 and beta-1,6 linkages suggests that EPS could be scleroglucan. The purified scleroglucan showed considerable antibacterial and antioxidant activities. The results indicated that, there was no cytotoxicity on normal cell (W138) and no effect on tumor cell lines including HepG2 and PC3 showing IC50 of 5096.83, 5885.80 and 4803.90 mu g/mL, respectively. The results showed also that Sclg could reduce the cytopathic effect by 50% (EC50) at 15 and 50 mu g/mL of herpes simplex virus type-1 (HSV-1) and influenza virus (H5N1), respectively. (C) 2020 Elsevier B.V. All rights reserved.