Efficient utilization of hemicellulose hydrolysate for propionic acid production using Propionibacterium...

Area of Science:

• Biotechnology and Bioengineering
• Renewable Energy Sources
• Industrial Microbiology

Background:

• Hemicellulose is a key renewable resource in biorefineries, primarily composed of glucose, xylose, and arabinose.
• Propionic acid is a valuable chemical with diverse industrial applications.

Purpose of the Study:

• To investigate propionic acid production from individual hemicellulose sugars (glucose, xylose, arabinose) using Propionibacterium acidipropionici ATCC 4875.
• To evaluate the efficacy of hemicellulose hydrolysate, specifically corncob molasses, as a substrate for propionic acid fermentation.

Main Methods:

• Fed-batch fermentation of Propionibacterium acidipropionici ATCC 4875 using glucose, xylose, or arabinose.
• Fermentation using corncob molasses as a representative hemicellulose hydrolysate.

Main Results:

• Xylose fermentation yielded a final propionic acid concentration of 53.2 g/l.
• Fermentation with corncob molasses resulted in 71.8 g/l propionic acid at a productivity of 0.28 g/l/h.
• Propionibacterium acidipropionici efficiently utilizes hemicellulose-derived sugars for propionic acid synthesis.

Conclusions:

• Hemicellulose hydrolysate is a suitable and effective carbon source for propionic acid production.
• Corncob molasses presents a viable and efficient substrate for industrial-scale propionic acid generation.
• This study highlights the potential of utilizing waste biomass for valuable chemical production.