Isolation, purification, and structural characterization of a novel polysaccharide from Ganoderma capense

Area of Science:

• Mycology
• Biochemistry
• Pharmacology

Background:

• Mushrooms of the genus Ganoderma are recognized for diverse biological activities.
• Ganoderma capense exhibits potential pharmacological properties, but its biochemical constituents are underexplored.
• Polysaccharides from Ganoderma species often possess significant health benefits.

Purpose of the Study:

• To isolate, purify, and characterize the structure of a novel polysaccharide from Ganoderma capense mycelia.
• To investigate the potential pharmacological relevance of the isolated polysaccharide.

Main Methods:

• Submerged fermentation of Ganoderma capense mycelia followed by hot water extraction.
• Purification using DEAE Sepharose CL-6B and Sephadex G-75 column chromatography.
• Structural elucidation via HPGPC, optical rotation, monosaccharide analysis, methylation, periodic acid oxidation, GC-MS, FT-IR, and NMR spectroscopy.

Main Results:

• A novel water-soluble polysaccharide, GCP50-1, was successfully isolated and purified.
• HPGPC indicated an average molecular weight of 1.5 × 10(4) Da, with a specific optical rotation of +170°.
• Structural analysis revealed GCP50-1 as an alpha-D-glucan with a specific linkage pattern in its backbone and side chains.

Conclusions:

• The detailed structure of the novel polysaccharide GCP50-1 from Ganoderma capense mycelia was elucidated for the first time.
• The findings contribute valuable biochemical data on Ganoderma capense, potentially paving the way for its pharmaceutical applications.