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000820455 0247_ $$2doi$$a10.1140/epje/i2016-16086-5
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000820455 1001_ $$0P:(DE-HGF)0$$aEguchi, Kazuya$$b0
000820455 245__ $$aThermophoresis of cyclic oligosaccharides in polar solvents
000820455 260__ $$aBerlin$$bSpringer$$c2016
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000820455 520__ $$aCyclodextrins are cyclic oligosaccharides which are interesting as drug delivery systems, because they can be used as containers for pharmaceutical substances. We studied the Ludwig-Soret effect of $\alpha$-, $\beta$-, $\gamma$- and methyl-$\beta$-cyclodextrin in water and formamide by infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS).In water the Soret coefficient, $S_{\mathrm{T}}$, of $\alpha$-, $\beta$- and $\gamma$-cyclodextrin increases with increasing temperature and shows a sign change from negative to positive around $T=35^\circ$C, while $S_{\mathrm{T}}$ of methyl-$\beta$-cyclodextrin is positive in the entire investigated temperature. In formamide $S_{\mathrm{T}}$-values of all cyclodextrins coincide and show a slight decrease with temperature. We discuss the obtained results and relate the $S_{\mathrm{T}}$-values to the different hydrogen bonding capabilities of the cyclodextrins and the used solvents. It turns out that the change of $S_{\mathrm{T}}$ with temperature correlates with the partition coefficient, log~$P$, which indicates that more hydrophilic substances show a more pronounced temperature sensitivity of $S_{\mathrm{T}}$. Additionally we obtained a surprising result measuring the refractive index contrast factor with temperature, $(\partial n/\partial T)_{c,p}$ of cyclodextrins in formamide, which might be explained by a complex formation between cyclodextrins and formamide.
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000820455 7001_ $$0P:(DE-Juel1)166572$$aNiether, Doreen$$b1$$eCorresponding author
000820455 7001_ $$0P:(DE-Juel1)131034$$aWiegand, Simone$$b2
000820455 7001_ $$0P:(DE-HGF)0$$aKita, Rio$$b3$$eCorresponding author
000820455 773__ $$0PERI:(DE-600)2004003-9$$a10.1140/epje/i2016-16086-5$$gVol. 39, no. 9, p. 86$$n9$$p86$$tThe @European physical journal / E$$v39$$x1292-895X$$y2016
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