Applied Microbiology and Biotechnology

, Volume 87, Issue 1, pp 167–174 | Cite as

Pseudomonas aeruginosa PAO1 as a model for rhamnolipid production in bioreactor systems

  • Markus Michael Müller
  • Barbara Hörmann
  • Christoph Syldatk
  • Rudolf Hausmann
Biotechnological Products and Process Engineering

Abstract

Rhamnolipids are biosurfactants with interesting physico-chemical properties. However, the main obstacles towards an economic production are low productivity, high raw-material costs, relatively expensive downstream processing, and a lack of understanding the rhamnolipid production regulation in bioreactor systems. This study shows that the sequenced Pseudomonas aeruginosa strain PAO1 is able to produce high quantities of rhamnolipid during 30 L batch bioreactor cultivations with sunflower oil as sole carbon source and nitrogen limiting conditions. Thus PAO1 could be an appropriate model for rhamnolipid production in pilot plant bioreactor systems. In contrast to well-established production strains, PAO1 allows knowledge-based systems biotechnological process development combined with the frequently used heuristic bioengineering approach. The maximum rhamnolipid concentration obtained was 39 g/L after 90 h of cultivation. The volumetric productivity of 0.43 g/Lh was comparable with previous described production strains. The specific rhamnolipid productivity showed a maximum between 40 and 70 h of process time of 0.088 gRL/gBDMh. At the same time interval, a shift of the molar di- to mono-rhamnolipid ratio from 1:1 to about 2:1 was observed. PAO1 not only seems to be an appropriate model, but surprisingly has the potential as a strain of choice for actual biotechnological rhamnolipid production.

Keyword

Rhamnolipids Pseudomonas aeruginosa PAO1 Glycolipids Renewable resources Systems biotechnology Biosurfactants 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Markus Michael Müller
    • 1
  • Barbara Hörmann
    • 1
  • Christoph Syldatk
    • 1
  • Rudolf Hausmann
    • 1
  1. 1.Institut für Bio-und Lebensmitteltechnik, Technische BiologieKarlsruhe Institute of Technology (KIT)KarlsruheGermany

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