Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23343
Title: Effect of exopolysaccharides on the adsorption of metal ions by Pseudomonas sp CU-1
Authors: Lau, TC
Wu, XA
Chua, H
Qian, PY
Wong, PK
Keywords: Dye binding
Exopolysaccharides
Metal ion adsorption
Pseudomonas
Issue Date: 2005
Publisher: I W A Publishing
Source: Water science and technology, 2005, v. 52, no. 7, p. 63-68 How to cite?
Journal: Water Science and Technology 
Abstract: Pseudomonas sp. CU-1, which was isolated from an interfacial biofilm of a sludge sample collected from an electroplating company, had a relatively high ability to adsorb Cu2+ in solution. The bacterium grown in broth culture produced a large amount of capsular exopolymers mainly consisting of polysaccharides. The exopolysaccharides (EPS) were partially purified. The adsorption isotherm experiments showed that cells and EPS of Pseudomonas sp. CU-1 had similar Q(o) and b for the dye, Janus Green, and Cu2+. The adsorption of Cu2+ by cells could be monitored by the amount of dye displaced, due to the binding of metal ions onto the cell surface. The order of adsorption ability of metal ions and dye displacement by metal ion of the bacterium was: Cu2+ > Cd2+ > Zn2+ > Ni2+. The results of the dye displacement by metal ions binding onto the surfaces of cells, EPS-removed cells, and EPS suggest that EPS produced by Pseudomonas sp. CU-1 plays an important role in preventing metal ions in the surrounding environment from contact with the bacterial cells. The possible role of the metal ion adsorption by the EPS of this biofilm bacterium was discussed.
Description: IWA International Conference on Biofilm Structure and Activity, Las Vegas, Nv, 24-26 October 2004
URI: http://hdl.handle.net/10397/23343
ISSN: 0273-1223
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