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Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
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Updated: May 2, 2026

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Streamlining ε-PL Production: Recent Trends in Fermentation and Downstream Processing.

Bahar Sağlam1, Melis Kalkan2, Özlem Üstün-Aytekin3

  • 1Bioengineering Department, Faculty of Chemical and Metallurgical Engineering, Yıldız Technical University, İstanbul, Turkey.

Biotechnology and Applied Biochemistry
|December 29, 2025
PubMed
Summary

Poly-lysine derivatives, particularly ε-poly-L-lysine (ε-PL), are versatile biopolymers. This review highlights advancements in ε-PL purification for industrial applications and cost-effective production.

Keywords:
Streptomyces albulusfed‐batch fermentationpurificationε‐poly‐l‐lysine

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Area of Science:

  • Biotechnology and biopolymer science.
  • Focus on microbial fermentation and downstream processing.

Background:

  • Poly-lysine derivatives, especially ε-poly-L-lysine (ε-PL), are valued for their biodegradability, water solubility, and non-toxicity.
  • ε-PL finds applications in food additives, drug delivery, nanoparticles, and hydrogels.
  • Streptomyces albulus is the primary industrial microorganism for ε-PL production via fermentation.

Purpose of the Study:

  • To review recent advancements in ε-PL purification methods.
  • To highlight techniques improving purity and scalability for industrial use.
  • To provide insights for optimizing ε-PL production and tailoring its properties.

Main Methods:

  • Review of literature on strain improvement, medium optimization, and fermentation processes.
  • Analysis of innovative separation and purification techniques for ε-PL.
  • Discussion of methods enhancing purity and scalability.

Main Results:

  • Fermentation is the preferred method for ε-PL yield.
  • Various studies focus on cost-effective production through strain development and process optimization.
  • Recent purification advancements aim to increase purity and industrial scalability.

Conclusions:

  • Optimized purification methods are crucial for industrial ε-PL applications.
  • Further research can enhance ε-PL production efficiency and tailor its properties.
  • ε-PL holds significant potential across various industries due to its favorable characteristics.