Ion-specific weak adsorption of salts and water/octanol transfer free energy of a model amphiphilic hexapeptide
Physical Chemistry Chemical Physics, ISSN: 1463-9076, Vol: 13, Issue: 15, Page: 6883-6893
2011
- 153Citations
- 63Captures
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Metrics Details
- Citations153
- Citation Indexes153
- 153
- CrossRef142
- Captures63
- Readers63
- 63
Article Description
An amphiphilic hexapeptide has been used as a model to quantify how specific ion effects induced by addition of four salts tune the hydrophilic/hydrophobic balance and induce temperature-dependant coacervate formation from aqueous solution. The hexapeptide chosen is present as a dimer with low transfer energy from water to octanol. Taking sodium chloride as the reference state in the Hofmeister scale, we identify water activity effects and therefore measure the free energy of transfer from water to octanol and separately the free energy associated to the adsorption of chaotropic ions or the desorption of kosmotropic ions for the same amphiphilic peptide. These effects have the same order of magnitude: therefore, both energies of solvation as well as transfer into octanol strongly depend on the nature of the electrolytes used to formulate any buffer. Model peptides could be used on separation processes based on criteria linked to "Hofmeister" but different from volume and valency. © the Owner Societies 2011.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=79953325368&origin=inward; http://dx.doi.org/10.1039/c0cp02495c; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84996623788&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/21409276; https://xlink.rsc.org/?DOI=c0cp02495c; https://dx.doi.org/10.1039/c0cp02495c; https://pubs.rsc.org/en/content/articlelanding/2011/cp/c0cp02495c
Royal Society of Chemistry (RSC)
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