Document Detail


Adsorption of alpha amino acids at the water/goethite interface.
MedLine Citation:
PMID:  18155715     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The adsorption of amino acids onto mineral surfaces plays an important role in a wide range of areas, e.g., low-temperature aqueous geochemistry, bone formation and protein-bone interactions. In this work, the adsorption of three alpha aminoacids (sarcosine, MIDA and EDDA) onto goethite (alpha-FeOOH) was studied as a function of pH and background electrolyte concentration at 25.0 degrees C, and the molecular structures of the surface complexes formed were analyzed by means of ATR-FTIR spectroscopy. The results showed that adsorption of alpha amino acids were strongly dependent on the functionality and structure of the ligands. No adsorption was detected for the zwitterionic sarcosine indicating that simple alpha amino acids without other ionizable and/or functional groups display insignificant affinity for mineral surfaces such as goethite. With respect to the more complex amino acids, which are surface reactive, the number and relative positions of carboxylate and amine groups determine the types of surface interactions. These interactions range from non-specific outer-sphere to specific inner-sphere interactions as shown by the MIDA and EDDA results, respectively. The results presented herein suggest that isomerically-selective adsorption might only occur for amino acids that are capable of specific surface interactions, either through site-specific hydrogen bonding or inner-sphere complexation.
Authors:
Katarina Norén; John S Loring; Per Persson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-05
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  319     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-04     Completed Date:  2008-04-03     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  416-28     Citation Subset:  IM    
Affiliation:
Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Alanine / chemistry
Amino Acids / chemistry*
Edetic Acid / analogs & derivatives,  chemistry
Glycine / chemistry
Iron Compounds / chemistry*
Models, Molecular
Sarcosine / chemistry
Spectrophotometry, Infrared
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis
Water / chemistry
X-Rays
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Iron Compounds; 107-97-1/Sarcosine; 1310-14-1/goethite; 56-40-6/Glycine; 56-41-7/Alanine; 5657-17-0/EDDA; 60-00-4/Edetic Acid; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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