1. Attachment of Ribonucleotides on α-Alumina as a Function of pH, Ionic Strength, and Surface Loading
- Author
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Robert M. Hazen, Dimitri A. Sverjensky, Cécile Feuillie, Geophysical Laboratory [Carnegie Institution], and Carnegie Institution for Science [Washington]
- Subjects
Surface Properties ,Inorganic chemistry ,Context (language use) ,chemistry.chemical_compound ,Adsorption ,Aluminum Oxide ,Electrochemistry ,Organic chemistry ,General Materials Science ,Nucleotide ,Spectroscopy ,Equilibrium constant ,chemistry.chemical_classification ,Molecular Structure ,Chemistry ,Osmolar Concentration ,Surfaces and Interfaces ,Hydrogen-Ion Concentration ,Ribonucleotides ,Condensed Matter Physics ,Phosphate ,13. Climate action ,Ionic strength ,Nucleic acid ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Stoichiometry - Abstract
International audience; The interactions between nucleic acids and mineral surfaces have been the focus of many studies in environmental sciences, in biomedicine, as well as in origin of life studies for the prebiotic formation of biopolymers. However, few studies have focused on a wide range of environmental conditions and the likely modes of attachment. Here we investigated the adsorption of ribonucleotides onto α-alumina surfaces over a wide range of pH, ionic strength, and ligand-to-solid ratio, by both an experimental and a theoretical approach. The adsorption of ribonucleotides is strongly affected by pH, with a maximum adsorption at pH values around 5. Alumina adsorbs high amounts of nucleotides >2 μmol/m 2. We used the extended triple-layer model (ETLM) to predict the speciation of the surface complexes formed as well as the stoichiometry and equilibrium constants. We propose the formation of two surface species: a monodentate inner-sphere complex, dominant at pH
- Published
- 2014