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• W2325484770 startingPage "10979" @default.
• W2325484770 abstract "Cosolvent effects on protein or polymer collapse transitions are typically discussed in terms of a two-state free energy change that is strictly linear in cosolute concentration. Here we investigate in detail the nonlinear thermodynamic changes of the collapse transition occurring at the lower critical solution temperature (LCST) of the role-model polymer poly(N-isopropylacrylamide) [PNIPAM] induced by Hofmeister salts. First, we establish an equation, based on the second-order expansion of the two-state free energy in concentration and temperature space, which excellently fits the experimental LCST curves and enables us to directly extract the corresponding thermodynamic parameters. Linear free energy changes, grounded on generic excluded-volume mechanisms, are indeed found for strongly hydrated kosmotropes. In contrast, for weakly hydrated chaotropes, we find significant nonlinear changes related to higher order thermodynamic derivatives of the preferential interaction parameter between salts and polymer. The observed non-monotonic behavior of the LCST can then be understood from a not yet recognized sign change of the preferential interaction parameter with salt concentration. Finally, we find that solute partitioning models can possibly predict the linear free energy changes for the kosmotropes, but fail for chaotropes. Our findings cast strong doubt on their general applicability to protein unfolding transitions induced by chaotropes." @default.
• W2325484770 created "2016-06-24" @default.
• W2325484770 creator A5067862645 @default.
• W2325484770 creator A5070790975 @default.
• W2325484770 date "2014-09-05" @default.
• W2325484770 modified "2023-10-11" @default.
• W2325484770 title "Thermodynamic Description of Hofmeister Effects on the LCST of Thermosensitive Polymers" @default.
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• W2325484770 doi "https://doi.org/10.1021/jp5041635" @default.
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• W2325484770 hasPublicationYear "2014" @default.
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