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Zeitschrift für Naturforschung C

A Journal of Biosciences

Editor-in-Chief: Seibel, Jürgen

Editorial Board: Aigner , Achim / Boland, Wilhelm / Bornscheuer, Uwe / Hoffmann, Klaus


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1865-7125
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Volume 40, Issue 1-2

Issues

Chemical and Physical Characterization of Four Interfacial-Active Rhamnolipids from Pseudomonas spec. DSM 2874 Grown on n-Alkanes

Christoph Syldatk
  • Institut für Biochemie und Biotechnologie, Technische Universität Braunschweig. Biiltenweg 17, D-3300 Braunschweig. Bundesrepublik Deutschland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Siegmund Lang
  • Institut für Biochemie und Biotechnologie, Technische Universität Braunschweig. Biiltenweg 17, D-3300 Braunschweig. Bundesrepublik Deutschland
  • Other articles by this author:
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/ Fritz Wagner
  • Institut für Biochemie und Biotechnologie, Technische Universität Braunschweig. Biiltenweg 17, D-3300 Braunschweig. Bundesrepublik Deutschland
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/ Victor Wray
  • Gesellschaft für Biotechnologische Forschung, D-3300 Braunschweig-Stöckheim, Bundesrepublik Deutschland
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  • De Gruyter OnlineGoogle Scholar
/ Ludger Witte
  • Gesellschaft für Biotechnologische Forschung, D-3300 Braunschweig-Stöckheim, Bundesrepublik Deutschland
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znc-1985-1-212

Four extracellular glycolipids produced under growth-limiting conditions were isolated from the culture broth of Pseudomonas spec. DSM 2874. After purification by column and thick-layer chromatography they were identified as anionic rhamnolipids. 1H and 13C-NMR studies showed that two of these, β(β(2-O-α-ʟ-rhamnopyranosyloxy)decanoyl)decanoic acid and β(β(2-O-α-ʟ- rhamnopyranosyl-α-ʟ-rhamnopyranosyloxy)decanoyloxy)decanoic acid, were identical with com­pounds described previously, while the other more hydrophilic compounds, β(2-O-α-ʟ-rhamno- pyranosyloxy)decanoic acid and β(2-O-β-ʟ-rhamnopyranosyl-a-ʟ-rhamnopyranosyloxy)decanoic acid, were new compounds.

Surface and interfacial activity of the organic crude extract and of the purified components were determined in different aqueous solutions. The pH-dependence of surface and interfacial properties of the two previously described rhamnolipids (4. 20. 23) were examined in Teorell- Stenhagen-buffer (supplemented with 10% NaCl) at pH 3.0 and pH 9.0. All rhamnolipids reduced the surface-tension from 72 to about 30 mɴ/m and the interfacial-tension from 42 to about 1 mɴ/m. The critical micelle concentrations were of the order of 5 to 200 mg/l depending on the structure of the molecule.

Keywords: Pseudomonas; Interfacial-Active; Rham nolipids; n-Alkanes; Structure-Eludication

About the article

Received: 1984-08-20

Published Online: 2014-06-02

Published in Print: 1985-02-01


Citation Information: Zeitschrift für Naturforschung C, Volume 40, Issue 1-2, Pages 51–60, ISSN (Online) 1865-7125, ISSN (Print) 0939-5075, DOI: https://doi.org/10.1515/znc-1985-1-212.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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