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Formation and analysis of mannosylerythritol lipids secreted by Pseudozyma aphidis

U Rau1, L A Nguyen, S Schulz

  • 1Institute of Biochemistry and Biotechnology, Technical University Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany. u.rau@tu-bs.de

Applied Microbiology and Biotechnology
|July 13, 2004
PubMed

Insights

Pseudozyma aphidis DSM 70725 produces mannosylerythritol lipids (MELs). Optimizing carbon sources like soybean oil and mannose enhanced MEL yield to 75 g/L, with applications in surface tension reduction.

Area of Science:

  • Microbiology
  • Biotechnology
  • Biochemistry

Background:

  • Mannosylerythritol lipids (MELs) are biosurfactants with diverse applications.
  • Identifying novel microbial producers and optimizing their production is crucial for industrial viability.

Purpose of the Study:

  • To investigate Pseudozyma aphidis DSM 70725 as a novel producer of MELs.
  • To optimize MEL production by evaluating different carbon sources and feeding strategies.
  • To characterize the properties of the produced MELs.

Main Methods:

  • Cultivation of Pseudozyma aphidis DSM 70725 using various carbon sources.
  • Quantification of MELs using High-Performance Liquid Chromatography (HPLC).
  • Analysis of fatty acid composition using Gas Chromatography-Mass Spectrometry (GC-MS).
  • Measurement of surface and interfacial tension.

Main Results:

  • Pseudozyma aphidis DSM 70725 was confirmed as a novel MEL producer.
  • High initial concentrations of soybean oil (80 ml/L) and the use of mannose or erythritol as secondary carbon sources significantly enhanced MEL yield.
  • A maximum yield of 75 g/L was achieved in shake-flask cultivation.
  • MELs demonstrated significant reduction in surface tension (26.2 mN/m) and interfacial tension (1 mN/m).

Conclusions:

  • Pseudozyma aphidis DSM 70725 is an efficient microbial producer of MELs.
  • Optimized substrate strategies, including soybean oil and mannose, are key for maximizing MEL yield.
  • The produced MELs exhibit potent surface-active properties, indicating potential industrial applications.

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