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vol. 7, nr. 1 (2006)
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Propyl gallate-b-cyclodextrin complexes. Spectroscopic and thermodynamic studies
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Paweł Górnaś1, Krzysztof Dwiecki1, Małgorzata Nogala-Kałucka2, Krzysztof Polewski1
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1 Department of Physics, Agricultural University, ul. Wojska Polskiego 38/42, 60-637 Poznań |
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2 Department of Biochemistry and Food Analysis, Agricultural University, ul. Mazowiecka 48, 60-623 Poznań |
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vol. 7 (2006), nr. 1,
pp. 73-80
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abstract:
The spectral and temperature dependence of enhanced fluorescence of propyl gallate complexes with -cyclodextrin in aqueous solutions was investigated. From the temperature dependence data in the range of 278-333 K, equilibrium constant and thermodynamic parameters like free enthalpy, enthalpy and entropy for the complexation of PG with CD were calculated. At 293 K those values are Keq = 452 M-1 at 25 C, G = –62.4 kJ M-1, H = –113.1 kJ M-1 and S = –173 J M-1 K-1, respectively. Characterization of the fluorescence enhancing effect and structure of the forming complex were discussed on the basis of molecular interaction mechanisms.
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keywords:
cyclodextrins, propyl gallate, fluorescence, inclusion complex
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original in:
Polish
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