Bacterial color response to hexavalent chromium, Cr6+

Ka Hong Cheung, Ji Dong Gu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A blue pigment-producing bacterium, Vogesella indigofera, was isolated and quantified for the relationship between its synthesis of a blue pigment and exposure concentrations of Cr6+. The concentration of Cr6+ and the percentage of blue colonies on agar plates was negatively correlated (r2 = -0.8683). Critical concentrations inhibiting bacterial pigment production were found to be between 100-150 μg Cr6+/ml on agar plates and 200-300 μg Cr6+/ml in liquid culture. As the blue color is characteristic and easily observable, the bacterium Vogesella indigofera may have potential applications in the detection and monitoring of environmental pollution.

Original languageEnglish
Pages (from-to)234-236
Number of pages3
JournalJournal of Microbiology
Issue number3
StatePublished - Sep 2002
Externally publishedYes


  • Bacterial pollution indicator
  • Biomonitoring
  • Chromium
  • Heavy metals
  • Pollution
  • Vogesella indigofera


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