Isolation, Structural Characterization and Antioxidant Activities of Polysaccharide from Ganoderma lucidum (Higher Basidiomycetes)

To study the isolation, structural characterization and antioxidant activities of polysaccharide from the medicinal mushroom G.lucidum . In this study structural characterization of Ganoderma lucidum polysaccharides was conducted by Fourier Transform Infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) analyses. Antioxidant activities of Ganoderma lucidum polysaccharides was measured by 1,1–diphenyl–2–icryl-hydrazyl (DPPH-), Hydroxyl radical scavenging assay (HO-), superoxide anion (O-) radical scavenging assay and Ferrous ion (Fe 2+ ) chelating assay. Scavenging effect of G. lucidum polysaccharides and ascorbic acid on the DPPH radical scavenging, Hydroxyl radical scavenging, superoxide anion radical scavenging and Ferrous ion (Fe 2+ ) chelating radical scavenging-dependently increased and was 30.45% and 85.40%, 35.70% and 90.50%, 49.68% and 90.10%, 32.69% and 80.26% at the dose of 4 mg/ml respectively. The FT-IR spectra revealed the general characteristic absorbance peaks of the GLP. The SEM image demonstrated surface features of the GLP. This study suggests that the Ganoderma lucidum polysaccharides could potentially be used as natural antioxidants.