5 years ago

Efficient production of ε-poly-l-lysine from glucose by two-stage fermentation using pH shock strategy

Efficient production of ε-poly-l-lysine from glucose by two-stage fermentation using pH shock strategy
In this study, a pH shock strategy was employed to enhance ε-poly-L-lysine (ε-PL) production from glucose. In the conventional fermentation, in the early stage, only 13% of total ε-PL production is achieved in 25% of the entire fermentation period, which severely affected ε-PL productivity. To improve the efficiency of ε-PL production during fermentation, a novel two-stage fermentation, namely culture and fermentation stages, was proposed on the basis of the analysis of conventional pH shock fermentation. After optimization of parameters such as inoculum growth conditions, initial fermentation pH, and inoculum volume, the ε-PL production and productivity achieved using the novel fermentation process in a 5-L fermenter reached 32.22g/L and 5.86g/L/day, which were 32.3% and 36.6% higher, respectively, when compared with those obtained in conventional fermentation. Furthermore, evaluation of acid tolerance of mycelia collected from the pH shock fermentation showed that pH shock enhanced ε-PL production, which might be related to the acid tolerance of Streptomyces albulus and pH stress (pH 3.0). The results obtained could be useful for large-scale ε-PL production and to provide new information on ε-PL biosynthesis mechanism.

Publisher URL: www.sciencedirect.com/science

DOI: S1359511317307997

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.