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Adsorption mechanisms of glucose in aqueous goethite suspensions
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2011 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 353, no 1, 263-268 p.Article in journal (Refereed) Published
Abstract [en]

The adsorption of glucose and polysaccharides onto solid surfaces is important in several areas of science and engineering including soil chemistry and mineral processing. In this work we have studied the adsorption of D-glucose at the water-goethite (α-FeOOH) interface as a function of pH using batch adsorption measurements and a simultaneous infrared and potentiometric technique. Molecular orbital calculations were also performed in order to support interpretations of the infrared spectroscopic data. Infrared spectroscopy has shown that glucose adsorbs at the water-goethite interface with an intact ring structure and that the β-form is favored relative to the α isomer. The collective spectroscopic and macroscopic results were fully consistent with an adsorption mechanism where glucose interacts with goethite surface sites via hydrogen bonding interactions. Specific infrared peak shifts indicated that glucose primarily acts as a hydrogen bond donor and that it interacts with acceptor sites that become increasingly more prevalent as the surface is deprotonated. These results are in general agreement with the acid/base model for mono- and polysaccharide interactions at metal oxide surfaces, but contradict the inner sphere hypothesis that was proposed based on ex situ spectroscopic measurements.

Place, publisher, year, edition, pages
Elsevier Inc , 2011. Vol. 353, no 1, 263-268 p.
Keyword [en]
glucose, adsorption, infrared spectroscopy, hydrogen bonding
URN: urn:nbn:se:umu:diva-37777DOI: 10.1016/j.jcis.2010.09.023PubMedID: 20933242OAI: diva2:369940
Available from: 2010-11-12 Created: 2010-11-12 Last updated: 2011-09-15Bibliographically approved
In thesis
1. Surface reactions on mineral particles controlling the hydrolysis of glucose phosphates
Open this publication in new window or tab >>Surface reactions on mineral particles controlling the hydrolysis of glucose phosphates
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phosphorus (P) is an essential nutrient. A significant amount of soil P may be in the form of organophosphates. Due to the size of these compounds, hydrolysis is often required before P can be assimilated by organisms. Hydrolysis may be mediated by mineral surfaces, or catalyzed by extra cellular enzymes. Since both organophosphates and enzymes have a strong affinity for environmental particles, a study of the hydrolysis of organophosphates must focus on reactions at the water/particle interface. This thesis is a summary of four papers, discussing the adsorption, desorption, and abiotic and enzymatic hydrolysis of glucose-1-phosphate (G1P) and glucose-6-phosphate (G6P) in aqueous goethite suspensions. A new technique for simultaneous infrared and potentiometric titrations (SIPT) allowed in-situ measurements of the interfacial reactions. It was found that glucose phosphates form pH-dependent inner sphere complexes on goethite, which coordinate in a monodentate fashion, and are stabilized by hydrogen bonding. Desorption involves a change in speciation of the surface complexes, illustrating the difficulty in determining desorption rates for individual complexes. The surface mediated hydrolysis is primarily base catalyzed for G1P, and acid catalyzed for G6P. The difference is partly due to electronic factors, and partly to differences in glucose group/goethite interactions. Considerably more extensive is the hydrolysis catalyzed by an acid phosphatase (AcPase). The rate of the enzymatic hydrolysis are strongly dependent on the glucose phosphate surface coverage, showing that surface properties affect the adsorption mode of enzymes, and thus their catalytic activity. In solution, AcPase showed a greater specificity towards G6P, but this specificity was partly lost after adsorption onto goethite.

Place, publisher, year, edition, pages
Umeå: Kemiska institutionen, Umeå universitet, 2011
National Category
Other Basic Medicine
urn:nbn:se:umu:diva-46578 (URN)978-91-7459-270-2 (ISBN)
Public defence
2011-09-30, KBC-huset, KB3A9, Umeå universitet, Umeå, 10:00 (English)
Available from: 2011-09-09 Created: 2011-09-06 Last updated: 2011-09-06Bibliographically approved

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Olsson, RickardGiesler, ReinerPersson, Per
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