Journal
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Volume 81, Issue 7, Pages 1071-1075Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036024407070114
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The interaction of caffeine with hydroxypropyl- and methylcyclodextrins in water was studied by the calorimetry, spectroscopy, and solubility methods at 298.15 K. The interaction of caffeine with these cyclodextrins did not result in the formation of stable inclusion complexes and was mostly accompanied by predominantly endothermic effects of particle dehydration. The introduction of substituents and changes in the size of cyclodextrin molecular cavity did not influence the ability of cyclodextrins to form complexes with caffeine. The conclusion was drawn that substituted cyclodextrins could not be used for increasing the solubility of caffeine in water.
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