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Applied and Environmental Microbiology, October 2000, p. 4585-4588, Vol. 66, No. 10
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

A Rhamnolipid Biosurfactant Reduces Cadmium Toxicity during Naphthalene Biodegradation

Todd R. Sandrin, Andrea M. Chech, and Raina M. Maier*

Department of Soil, Water, and Environmental Science, University of Arizona, Tucson, Arizona 85721

Received 25 April 2000/Accepted 7 August 2000

A model cocontaminated system was developed to determine whether a metal-complexing biosurfactant, rhamnolipid, could reduce metal toxicity to allow enhanced organic biodegradation by a Burkholderia sp. isolated from soil. Rhamnolipid eliminated cadmium toxicity when added at a 10-fold greater concentration than cadmium (890 µM), reduced toxicity when added at an equimolar concentration (89 µM), and had no effect at a 10-fold smaller concentration (8.9 µM). The mechanism by which rhamnolipid reduces metal toxicity may involve a combination of rhamnolipid complexation of cadmium and rhamnolipid interaction with the cell surface to alter cadmium uptake.

* Corresponding author. Mailing address: Department of Soil, Water, and Environmental Science, 429 Shantz Building, University of Arizona, Tucson, AZ 85721. Phone: (520) 621-7231. Fax: (520) 621-1647. E-mail: rmaier{at}ag.arizona.edu.

Applied and Environmental Microbiology, October 2000, p. 4585-4588, Vol. 66, No. 10
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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