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Chemical Potential Derivatives and Preferential Interaction Parameters in Biological Systems from Kirkwood-Buff Theory

Department of Chemistry, Kansas State University, Manhattan, Kansas 66506-3701

Correspondence: Address reprint requests to Paul E. Smith, Dept. of Chemistry, 111 Willard Hall, Kansas State University, Manhattan, KS 66506-3701. Tel.: 785-532-5109; Fax: 785-532-6666; E-mail: pesmith{at}ksu.edu.

New expressions for chemical potential derivatives and preferential interaction parameters for ternary mixtures are derived for open, semiopen, and closed ensembles in terms of Kirkwood-Buff integrals, where all three components are present at finite concentrations. This is achieved using a simple approach that avoids the use of the general matrix formulation of Kirkwood-Buff theory. The resulting expressions provide a rigorous foundation for the analysis of experimental and simulation data. Using the results, a simple model is developed and used to investigate the possible effects of finite protein concentrations on the corresponding cosolvent dependent chemical potential and denaturation thermodynamics.

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