Innovative submerged directed fermentation: Producing high molecular weight polysaccharides from Ganoderma lucidum

Area of Science:

• Biotechnology
• Mycology
• Biochemistry

Background:

• Ganoderma lucidum polysaccharides (GLPs) possess significant bioactivity.
• Traditional cultivation methods result in low yields and variable quality of GLPs, hindering research and application.
• Intracellular polysaccharides (IPS) are a key bioactive component.

Purpose of the Study:

• To optimize submerged fermentation for directed acquisition of structurally defined, high molecular weight (MW) bioactive intracellular polysaccharides (IPS) from Ganoderma lucidum.
• To evaluate the impact of fermentation parameters on IPS yield and quality.
• To assess the potential for industrial-scale production of consistent quality GLPs.

Main Methods:

• Submerged fermentation process optimization, including inoculation amount, fermentation scale, initial glucose concentration, and fed-batch strategies.
• Analysis of high MW IPS content and monosaccharide composition.
• In vitro assessment of immunostimulatory effects of the purified polysaccharide.

Main Results:

• Inoculation amount and fermentation scale significantly influenced high MW IPS content.
• Lowering initial glucose concentration and employing fed-batch fermentation improved high MW IPS yield.
• Monosaccharide composition of high MW IPS remained stable across different fermentation scales.
• The purified β-glucan exhibited immunostimulatory effects in vitro.

Conclusions:

• Submerged fermentation enables controlled production of high MW bioactive GLPs with consistent structural characteristics.
• Optimized fermentation parameters significantly enhance IPS yield and quality.
• This approach validates the feasibility of industrial-scale production of GLPs, surpassing traditional cultivation limitations.
• The findings support the biotechnological application of Ganoderma lucidum polysaccharides.