A rhamnolipid biosurfactant reduces cadmium toxicity during naphthalene biodegradation.

ABSTRACT: 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 microM), reduced toxicity when added at an equimolar concentration (89 microM), and had no effect at a 10-fold smaller concentration (8.9 microM). 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.

SUBMITTER: Sandrin TR 

PROVIDER: S-EPMC92350 | biostudies-literature | 2000 Oct

REPOSITORIES: biostudies-literature