Optimizing Submerged Fermentation Conditions of Aspergillus niger for Chitin Production

Area of Science:

• Biotechnology
• Biopolymer Production
• Microbial Fermentation

Background:

• Chitin, a precursor to chitosan, can be sourced from fungi.
• Scalable chitin production requires optimized culture media and cultivation parameters.
• Aspergillus niger is a fungal candidate for chitin extraction.

Purpose of the Study:

• To optimize fungal biomass production of Aspergillus niger via submerged fermentation for chitin recovery.
• To evaluate the impact of culture media composition and bioprocess time on chitin yield.
• To determine optimal carbon and nitrogen source concentrations for maximizing fungal biomass and chitin production.

Main Methods:

• Factorial Design 2^4 was used to evaluate culture media composition and bioprocess time.
• Mixture Design was employed to optimize carbon and nitrogen source concentrations.
• Scale-up was conducted in a 5-L bioreactor under optimized conditions.

Main Results:

• An optimized medium of 7.5% wheat bran and 2.5% yeast extract was identified.
• Predicted yields were 4.40 g L^-1 fungal biomass and 25.24% chitin.
• Scale-up in a bioreactor achieved 10.20 g L^-1 biomass and 4.95 g L^-1 chitin after 84 hours.

Conclusions:

• Alternative culture media effectively support submerged fermentation of Aspergillus niger for chitin production.
• Optimized conditions and scale-up significantly enhance chitin yield.
• This bioprocess shows promise for sustainable and increased chitin recovery.