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Solubility of endotoxins from Escherichia coli and Pseudomonas aeruginosa

In English

Författare

Summary, in English

Background The Limulus amebocyte lysate (LAL) assay may underestimate endotoxins because only soluble endotoxins are determined. The solubility of endotoxins was, therefore, studied in two species of Gram-negative bacteria. Methods Cultures were grown in serum broth, cells were harvested by centrifugation and washed in physiological saline. Bacterial suspensions were either filtered through PTFE filters and air dried at room temperature, dried in polypropylene tubes at room temperature in a desiccator, or freeze dried. Samples were extracted with aqueous Tween 20. The soluble and insoluble fractions were dried, methanolysed, and hydroxy-fatty acid methyl esters were determined by gas chromatography (GC) as markers of endotoxins. Results The solubility of the endotoxins from Escherichia coli and Pseudomonas aeruginosa ranged from 9% to 83%. Species and drying conditions had substantial influence on the solubility. Conclusions Endotoxin exposure may be underestimated in environmental samples by the LAL test because a substantial fraction can be non-soluble and is not detected. (C) 2004 Wiley-Liss, Inc.

Publiceringsår

2004

Språk

Engelska

Sidor

375-377

Publikation/Tidskrift/Serie

American Journal of Industrial Medicine

Volym

46

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Microbiology in the medical area

Nyckelord

  • accuracy
  • endotoxins
  • solubility
  • Limulus amebocyte lysate test

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0271-3586