Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Heavy Metal Adsorption Characteristics of Extracellular Polysaccharide Produced by Zoogloea ramigera Grown on Various Carbon Sources

  • Kim, Se-Kyung (Institute of Industrial Biotechnology, Department of Biological Engineering, Inha University) ;
  • Lee, Choul-Gyun (Institute of Industrial Biotechnology, Department of Biological Engineering, Inha University) ;
  • Yun, Hyun-Shik (Institute of Industrial Biotechnology, Department of Biological Engineering, Inha University)
  • Published : 2003.10.01
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Abstract

Zoogloea ramigera produces an extracellular polysaccharide called zooglan, which adsorbs heavy metals. In the current study, Zoogloea ramigera was cultured in media containing various carbon sources. When different carbon sources were included in the cultivation medium, there was a change in the composition of zooglan that is mainly composed of glucose, galactose, and pyruvic acid. The various zooglan compositions were analyzed by HPLC, and changes in the heavy metal (lead (II) and cadmium) adsorption characteristics relative to a change in the composition were examined using an atomic absorption spectrophotometer. A high adsorption capacity was observed at a pH higher than 3.0. The adsorption of metal ions was the highest at $35^{\circ}C$, and a higher adsorption was obtained with a lower flow rate. Changes in the zooglan composition did result in changes in the heavy metal adsorption characteristics. Furthermore, it was also found that the pyruvic acid content was more important than the glucose or galactose content for heavy metal adsorption.

Keywords

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