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Influence of divalent cations and pH adsorption of a bacterial polysaccharide adhesin

DRS at CSIR-National Institute of Oceanography

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Title Influence of divalent cations and pH adsorption of a bacterial polysaccharide adhesin
 
Creator Bhosle, N.B.
Suci, P.A.
Baty, A.M.
Weiner, R.M.
Geesey, G.G.
 
Subject microorganisms
biochemical analysis
adsorption
diffusion
polysaccharides
cations
adhesives
pH
fourier transforms
x-ray spectroscopy
Bacteria
 
Description Hyphomonas MHS-3 elaborates a diffuse capsular material, primarily composed of polysaccharide, which has been implicated to serve as the holdfast of this prosthecate marine bacterium. A purified polysaccharide (fr2ps) from this capsular material exhibits a relatively large affinity for (Ge), or more precisely for the Ge oxide surface film. In its natural habitat MHS-3 attaches to marine sediments. This suggests that molecular properties of fr2ps have evolved to render it adhesive toward mineral oxides. In order to characterize these molecular interactions, the effect of divalent cations and pH on the adsorption of fr2ps to Ge has been measured using attenuated total internal reflection Fourier transform infrared (ATR/FT-IR) spectroscopy. The effect of adsorption of fr2ps on the Ge oxide film has been investigated using x-ray photoelectron spectroscopy (XPS). The results indicate that divalent cations participate in binding of fr2ps to Ge oxide and that atomic size of the cation is important. Evidence for significant participation of hydrogen bonding to the oxide surface is lacking
 
Date 2009-01-11T11:56:58Z
2009-01-11T11:56:58Z
1998
 
Type Journal Article
 
Identifier Journal of Colloid Interface Science, Vol.205; 89-96p.
http://drs.nio.org/drs/handle/2264/1921
 
Language en
 
Rights Copyright [1998]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier