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Titolo:
Determination of stoichiometry and equilibrium constants of complexes of tyrosine with cyclodextrins by time-resolved fluorescence spectroscopy and global analysis of fluorescence decays
Autore:
Wiczk, W; Mrozek, J; Szabelski, M; Karolczak, J; Guzow, K; Malicka, J;
Indirizzi:
Univ Gdansk, Fac Chem, PL-80952 Gdansk, Poland Univ Gdansk Gdansk PolandPL-80952 sk, Fac Chem, PL-80952 Gdansk, Poland Adam Mickiewicz Univ, Fac Phys, Quantum Elect Lab, PL-61614 Poznan, PolandAdam Mickiewicz Univ Poznan Poland PL-61614 Lab, PL-61614 Poznan, Poland
Titolo Testata:
CHEMICAL PHYSICS LETTERS
fascicolo: 1-2, volume: 341, anno: 2001,
pagine: 161 - 167
SICI:
0009-2614(20010615)341:1-2<161:DOSAEC>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
BETA-CYCLODEXTRIN; INCLUSION COMPLEXES; ALPHA-CYCLODEXTRIN; DERIVATIVES; 4H-1-BENZOPYRAN-4-THIONE; PHOSPHORESCENCE; 3H-INDOLE; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Wiczk, W Univ Gdansk, Fac Chem, Sobieskiego 18, PL-80952 Gdansk, Poland Univ Gdansk Sobieskiego 18 Gdansk Poland PL-80952 Gdansk, Poland
Citazione:
W. Wiczk et al., "Determination of stoichiometry and equilibrium constants of complexes of tyrosine with cyclodextrins by time-resolved fluorescence spectroscopy and global analysis of fluorescence decays", CHEM P LETT, 341(1-2), 2001, pp. 161-167

Abstract

Time-resolved fluorescence spectroscopy and global analysis of fluorescence decay times were applied to determine stoichiometry and equilibrium constants of complexes of tyrosine with alpha-, beta- and gamma -cyclodextrins (CDs). This study reveals from Global analysis of fluorescence decay curves of tyrosine with CDs in water the presence of only two fluorescence life-times of tyrosine: 3.35 +/- 0.10 ns for free tyrosine and 4.3 +/- 0.3 ns for the tyrosine-CD complex. The formation constants of tyrosine-CD complexes were determined from the pre-exponential factors as well as the fractional intensities and average fluorescence life-times. The cavity size of CD influenced the equilibrium constant but had no influence on the fluorescence life-time of the tyrosine-CD complex. (C) 2001 Elsevier Science B.V. All rights.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 16:18:45