Direct evidence for modified solvent structure within the hydration shell of a hydrophobic amino acid

Alexander Pertsemlidis, Anand M. Saxena, Alan K. Soper, Teresa Head-Gordon, Robert M. Glaeser

Resultado de la investigación: Articlerevisión exhaustiva

84 Citas (Scopus)

Resumen

Neutron scattering experiments are used to determine scattering profiles for aqueous solutions of hydrophobic and hydrophilic amino acid analogs. Solutions of hydrophobic solutes show a shift in the main diffraction peak to smaller angle as compared with pure water, whereas solutions of hydrophilic solutes do not. The same difference for solutions of hydrophobic and hydrophilic side chains is also predicted by molecular dynamics simulations. The neutron scattering curves of aqueous solutions of hydrophobic amino acids at room temperature are qualitatively similar to differences between the liquid molecular structure functions measured for ambient and supercooled water. The nonpolar solute-induced expansion of water structure reported here is also complementary to recent neutron experiments where compression of aqueous solvent structure has been observed at high salt concentration.

Idioma originalEnglish (US)
Páginas (desde-hasta)10769-10774
Número de páginas6
PublicaciónProceedings of the National Academy of Sciences of the United States of America
Volumen93
N.º20
DOI
EstadoPublished - oct. 1 1996
Publicado de forma externa

ASJC Scopus subject areas

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