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  Temperature induced crystallization transition in aqueous solutions of ß-cyclodextrin, heptakis(2,6-di-O-methyl)-ß-cyclodextrin (DIMEB), and heptakis(2,3,6-tri-O-methyl)-ß-cyclodextrin (TRIMEB) studied by differential scanning calorimetry

Frank, J., Holzwarth, J. F., & Saenger, W. (2002). Temperature induced crystallization transition in aqueous solutions of ß-cyclodextrin, heptakis(2,6-di-O-methyl)-ß-cyclodextrin (DIMEB), and heptakis(2,3,6-tri-O-methyl)-ß-cyclodextrin (TRIMEB) studied by differential scanning calorimetry. Langmuir, 18(16), 5974-5976. doi:10.1021/la020105a.

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 Creators:
Frank, Joachim1, Author           
Holzwarth, Josef F.1, Author           
Saenger, Wolfram, Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

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Free keywords: INCLUSION COMPLEXES; NEUTRON-DIFFRACTION; UNDECAHYDRATE; TOPOGRAPHY
 Abstract: Methylated cyclodextrins were investigated to shed light on their solubility behavior in water where they exhibit a negative temperature coefficient, contrasting the positive temperature coefficient of unmodified cyclodextrins. Both heptakis(2,6-di-O-methyl)-beta-cyclodextrin (DIMEB) and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (TRIMEB) show two different conditions of crystallization. At low temperatures around IS degreesC, highly hydrated clathrates are formed, whereas, at high temperatures around 60-70 degreesC, DIMEB crystallizes as an anhydrate and TRIMEB as a monohydrate. The crystallization at high temperature is driven by entropy gain of water to compensate for the positive enthalpy change associated with this crystallization process, as could be shown by differential scanning calorimetry experiments in H2O and D2O.

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Language(s): eng - English
 Dates: 2002-08-06
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 8292
DOI: 10.1021/la020105a
 Degree: -

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Title: Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 18 (16) Sequence Number: - Start / End Page: 5974 - 5976 Identifier: -