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000858228 1001_ $$0P:(DE-Juel1)166572$$aNiether, Doreen$$b0$$ufzj
000858228 245__ $$aPeptide model systems: Correlation between thermophilicity and hydrophilicity
000858228 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2018
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000858228 520__ $$aIn recent years, the response of biomolecules to a temperature gradient has been utilized to monitor reactions of biomolecules, but the underlying mechanism is not well understood due to the complexity of the multicomponent system. To identify some underlying principles, we investigate the thermal diffusion of small amide molecules in water systematically. We re-analyze previous measurements of urea and formamide and compare the results with acetamide, N-methylformamide, and N, N-dimethylformamide, amides with a lower hydrophilicity. It turns out that less hydrophilic substances do not show the typical temperature dependence of water soluble macromolecules. Analyzing temperature and concentration dependent measurements using an empirical expression originally derived for nonpolar mixtures, we find that the so-called isotope contribution depends strongly on the hydrophilicity of the solute. This can be qualitatively understood by comparing with molecular dynamic simulations of Lennard-Jones fluids. The hydrophobic/hydrophilic balance also influences the structure in the fluid and with that the thermal expansion coefficient, which correlates with the thermal diffusion coefficient. Furthermore, we observe a clear correlation of the temperature and concentration dependence of the Soret coefficient with the hydrophilicity, which can be quantitatively described by the partition coefficient log P
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000858228 7001_ $$0P:(DE-Juel1)130773$$aKriegs, Hartmut$$b1
000858228 7001_ $$0P:(DE-Juel1)130616$$aDhont, Jan K. G.$$b2
000858228 7001_ $$0P:(DE-Juel1)131034$$aWiegand, Simone$$b3$$eCorresponding author
000858228 773__ $$0PERI:(DE-600)1473050-9$$a10.1063/1.5042051$$gVol. 149, no. 4, p. 044506 -$$n4$$p044506 -$$tThe journal of chemical physics$$v149$$x1089-7690$$y2018
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000858228 8564_ $$uhttps://juser.fz-juelich.de/record/858228/files/1.5042051.pdf$$yPublished on 2018-07-30. Available in OpenAccess from 2019-07-30.
000858228 8564_ $$uhttps://juser.fz-juelich.de/record/858228/files/amide018-asub-002.pdf$$yPublished on 2018-07-30. Available in OpenAccess from 2019-07-30.
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