9-13 July 2012
Africa/Johannesburg timezone
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On the calculation of solvation free energy from Kirkwood-Buff integrals: A large scale molecular dynamics study

Presented by Mr. Wynand DEDNAM on 13 Jul 2012 from 11:00 to 11:20
Type: Oral Presentation
Session: Biophysics
Track: Track A - Division for Condensed Matter Physics and Materials

Abstract

Solvation of (bio)molecules in water is severely affected by the presence of cosolvent within the hydration shell of the solute structure. Furthermore, since solute molecules can range from small molecules, such as methane, to a large protein structure, it is imperative to understand the detailed structure-function relationship on the microscopic level. In this context, Kirkwood-Buff (KB) theory, which connects the microscopic pair-wise molecular distributions to global thermodynamic properties, provides a widely accepted framework. In this talk, we present a molecular dynamics simulation approach to calculate the solvation free energies within the framework of KB theory of solutions. As initial test cases, we study the solvation of methane, ethanol, and propanol in aqueous methanol mixtures. Our results are in good agreement with the existing experimental data. The approach presented here can also be used to study conformational transitions of large (bio)macromolecules.

Award

Yes

Level

Hons

Supervisor

Prof. A.E. Botha, bothaae@unisa.ac.za, University of South Africa

Paper

Yes

Place

Location: IT 4-4
Room:


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