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Researchers developed a renewable fermentation process for propionic acid (PA), a key industrial chemical. This bio-based method offers a cost-effective alternative to petrochemical production, using optimized microbial strains and sustainable feedstocks.

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Area of Science:

  • Biotechnology
  • Industrial Microbiology
  • Chemical Engineering

Background:

  • Propionic acid (PA) is a versatile short-chain fatty acid with significant industrial applications.
  • Current petrochemical production routes for PA face challenges related to price volatility and feedstock availability.
  • Developing a renewable, cost-effective production method for PA is crucial for sustainable chemical manufacturing.

Purpose of the Study:

  • To engineer an industrially feasible and renewable fermentation process for propionic acid (PA) production.
  • To optimize microbial strains and fermentation conditions for enhanced PA yield and productivity.
  • To reduce production costs by utilizing industrial-grade feedstocks.

Main Methods:

  • Screening of seventeen Propionibacterium strains to identify the optimal platform strain for PA fermentation.
  • Optimization of fermentation parameters, including inoculum density, headspace pressure, and shear, to maximize productivity and minimize byproducts.
  • Transitioning from lab-grade media to industrial feedstocks, such as enzymatically treated corn mash (ECM), with supplementation as needed.

Main Results:

  • Propionibacterium acidipropionici ATCC 4875 was selected as the platform strain.
  • Fermentation productivity was tripled to over 2 g/l/h through inoculum densification.
  • Optimized ECM medium with cyanocobalamin supplementation achieved 0.5 g/l/h productivity and 0.60 g/g PA yield at a cost below $1/kg PA.

Conclusions:

  • The developed fermentation process significantly improves the economic viability of bio-based propionic acid production.
  • This renewable route offers a competitive alternative to traditional petrochemical manufacturing of PA.
  • Further optimization can bridge the gap between bio-based and petrochemical production costs for PA.