Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 in naphthalene-amended soils: Toxicity of naphthalene and its metabolites

W. Park, C. O. Jeon, H. Cadillo, C. DeRito, E. L. Madsen

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 was measured in nonsterile soil samples (coal tar-contaminated and pristine) with and without added crystalline naphthalene over a period of 21 days. A 2-3 log decrease in cfu occurred in the presence, but not absence, of added naphthalene. We used aqueous suspensions of crystalline naphthalene to explore potential mechanisms of its toxicity on the test bacterium under aerobic conditions. Measurements of dissolved naphthalene in medium indicated that uptake by P. putida NCIB 9816-4 maintained naphthalene at concentrations well below saturation. Accumulation of catechol was documented by high-performance liquid chromatography and gas chromatography/mass spectrometry in the presence of 0.5% (w/v) naphthalene crystals. Transient catechol accumulation was highest when cells entered stationary phase. A decrease in catechol concentration correlated with the development of brown color in the medium. Brown pigment accumulation correlated with a decrease in viable cell counts. These results suggested that catechol, related compounds, and their condensation products can accumulate to toxic levels in stationary phase P. putida NCIB 9816-4 cells. We hypothesize that the same mechanism of toxicity may occur under the nutrient-limited conditions expected in soil.

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalApplied Microbiology and Biotechnology
Issue number3
Publication statusPublished - 2004 Apr
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements This research was supported by National Science Foundation Grant MCB-0084175 to E.L.M. We thank Dr. Niels Kroer (National Environmental Research Institute, Denmark) for P. putida KT2440-Tc, and Dr. Hay for guidance on derivatization procedures.

Copyright 2008 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology


Dive into the research topics of 'Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 in naphthalene-amended soils: Toxicity of naphthalene and its metabolites'. Together they form a unique fingerprint.

Cite this