Thermodynamics of the encapsulation by cyclodextrins
| Autor: | Peter Wolschann, Aurawan Titwan, Siriporn Okonogi, Helmut Viernstein, Suporn Charumanee, Jakkapan Sirithunyalug, Petra Weiss-Greiler |
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| Rok vydání: | 2006 |
| Předmět: |
chemistry.chemical_classification
Reaction mechanism Cyclodextrin Renewable Energy Sustainability and the Environment Chemistry General Chemical Engineering Organic Chemistry Protonation Molecular encapsulation Pollution Tautomer Inorganic Chemistry Fuel Technology Deprotonation Computational chemistry Molecule Organic chemistry Solubility Waste Management and Disposal Biotechnology |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 81:523-529 |
| ISSN: | 1097-4660 0268-2575 |
| Popis: | Molecular encapsulation on a molecular basis can be performed by cyclodextrins. The inclusion of organic molecules into the interior changes the properties of these molecules, which may be used for a broad variety of applications. The affinity of guest molecules for the cavities of various cyclodextrins depends on the stereochemistry and on the interaction forces of the molecules involved. Calculations of the thermodynamic parameters show that the reaction entropy is highly important for the inclusion reaction. Completely different reaction mechanisms are observed for various types of cyclodextrins as some of these reactions show enthalpy–entropy compensation. Others are supported by the reaction entropy or are even entropically controlled. Protonation and deprotonation reactions contribute significantly to the inclusion reaction, as first of all the solubility of the compounds in water is strongly influenced by the acidity of the solution, and, moreover, all tautomeric forms of the compounds show different affinities to various cyclodextrins. Copyright © 2006 Society of Chemical Industry |
| Databáze: | OpenAIRE |
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