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Thermodynamic parameters for the molecular inclusion reaction of dulcin with beta-cyclodextrin. spectrofluorimetric determination of dulcin.
MedLine Citation:
PMID:  18965957     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The inclusion of dulcin in alpha- and beta-cyclodextrin has been studied by fluorescence spectroscopy. To quantitatively describe complex formation between the beta-cyclodextrin and dulcin, an association constant of 290 M(-1) at 21 degrees was obtained. The thermodynamics associated with the complex formation between dulcin and beta-cyclodextrin in aqueous solution has been studied. The obtained value of DeltaG(0) = -13.7 kJ/mole at 21 degrees , together with DeltaH(0) = -33.6 +/- 2.3 kJ/mole and DeltaS(0) = -67.2 +/-8.3 Jmole(-1) K(-1) indicate that dulcin has a very marked tendency to associate with beta-cyclodextrin in water. The inclusion complex of dulcin in beta-cyclodextrin has been used to determine dulein in the range 0.13-5 mug/ml the method has been applied to determine dulcin in soft drinks.
Authors:
A N Díaz; L S Feria; F G Sánchez
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Talanta     Volume:  41     ISSN:  0039-9140     ISO Abbreviation:  Talanta     Publication Date:  1994 Apr 
Date Detail:
Created Date:  2008-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  509-14     Citation Subset:  -    
Affiliation:
Departamento de Química Analítica, Facultad de Ciencias, Universidad de Málaga, 29071-Spain.
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