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Biodegradation and decolorization of azo dyes by adherent Staphylococcus lentus strain

Authors
  • Chaieb, Kamel1
  • Hagar, Mohamed2, 3
  • Radwan, Nagi R. E.2, 4
  • 1 Taibah University, Biology Department, College of Sciences, Yanbu el Baher, Kingdom of Saudi Arabia , Yanbu el Baher (Saudi Arabia)
  • 2 Taibah University, Chemistry Department, College of Sciences, Yanbu el Baher, Kingdom of Saudi Arabia , Yanbu el Baher (Saudi Arabia)
  • 3 Alexandria University, Chemistry Department, Faculty of Science, Alexandria, Egypt , Alexandria (Egypt)
  • 4 Suez University, Chemistry Department, Faculty of Science, Suez, Egypt , Suez (Egypt)
Type
Published Article
Journal
Applied Biological Chemistry
Publisher
Springer Netherlands
Publication Date
Feb 15, 2016
Volume
59
Issue
3
Pages
405–413
Identifiers
DOI: 10.1007/s13765-016-0169-4
Source
Springer Nature
Keywords
License
Yellow

Abstract

A Staphylococcus lentus strain, isolated from Red sea water, was tested for decolorization capacity of Congo red, Evans blue, and Eriochrome Black T azo dyes. Biodegradation (100 mgl−1) of these dyes was studied within 24 h in Mineral Salt Medium solution containing 0.10 % (w/v) yeast extract and 7 mM of glucose at a pH of 7.2 and a temperature of 37 °C. Using a 2.2 × 106 CFU/mL inoculum size, S. lentus was able to decolorize these azo dyes with different degree. The staphylococcal biomass achieves approximately 100 % decolorization of Congo red and Eriochrome Black T by the end of treatment. FTIR and UV–Vis analyses confirm biodegradation potential of the tested strain. Moreover, the phytotoxicity of the dye solutions resulting from this treatment shows lower toxic nature compared to untreated solution of the respective dyes.

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