Characteristics of spore-bound laccase from Bacillus subtilis WD23 and its use in dye decolorization Conference

cited authors

  • Wang, CL; Zhao, M; Wei, XD; Li, TL; Lu, L

fiu authors

abstract

  • Treatment of xenobiotic compounds such as textile dyes with bacterial laccases is limited to the acid pH range and moderate temperatures. A bacterial strain, designated as WD23, was isolated from forest soil using Luria-Bertani medium supplemented with 0.4 mmol/L Cu2+. The isolated strain was identified as Bacillus subtilis by physiological and biochemical tests and 16S rDNA sequence analysis. Here we charactered the spore-bound laccase of B. subtilis WD23 and used the laccase to decolorize dyes. The spores of the strain showed laccase-like activity, oxidizing syringaldazine, 2,6-dimethoxyphenol and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonate acid)(ABTS). The optimum pH and temperature for the spore-bound laccase were 6.8 and 60°C, respectively. It also showed higher stabilities over a broad pH range, the pH half-life was more than 6 months at pH 6.8. The spore laccase could efficiently decolorize 50∼90% of anthraquinone and azo dyes in 24 h. The spore laccase can play an important role in bioremediation. © (2010) Trans Tech Publications, Switzerland.

publication date

  • December 1, 2010

start page

  • 226

end page

  • 230

volume

  • 113-116