Fluorescence study of the solvation of fluorescent probes prodan and laurdan in poly(epsilon-caprolactone)-block-poly(ethylene oxide) vesicles in aqueous solutions with tetrahydrofurane

0315669 - ÚFCH JH 2009 RIV US eng J - Článek v odborném periodiku
Šachl, R. - Štěpánek, M. - Procházka, K. - Humpolíčková, Jana - Hof, Martin
Fluorescence study of the solvation of fluorescent probes prodan and laurdan in poly(epsilon-caprolactone)-block-poly(ethylene oxide) vesicles in aqueous solutions with tetrahydrofurane.
[Studium florescence na solvataci fluorescentního čidla prodan a laurdan v bublinách poly(.epsilon.-kaprolakton)-block-poly(ethylen oxidu) ve vodním roztoku s tetrahydrofuranem.]
Langmuir. Roč. 24, č. 1 (2008), s. 288-295. ISSN 0743-7463
Grant CEP: GA AV ČR IAA400400503
Grant ostatní: GA ČR IAA401110702
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: block-copolymer micelles * solvent relaxation * dynamics
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 4.097, rok: 2008

Steady-state and time-resolved fluorescence measurements were used to study the relaxation of the microenvironment of hydrophobic probes 6-propionyl-2-(dimethylamino)naphthalene (prodan) and 6-dodecanoyl-2-(dimethylamino)naphthalene (laurdan) in systems containing vesicles formed by the amphiphilic diblock copolymer poly(E-caprolactone)block-poly (ethylene oxide) (PCL-PEO) and water/tetrahydrofurane (THF) solvent mixtures. It was found that in case of prodan, both steady-state and time-resolved emission spectra were composed of two subspectra corresponding to the emission of prodan molecules located (i) in fairly rigid (effectively viscous) and hydrophobic domains of the vesicles close to the PCL/PEO interface and (ii) in a more polar and less viscous medium (in the bulk solution). The fraction of the emission from the more polar microenvironment increases with increasing content of THF in the system.

Práce se zabývá studiem florescence na solvataci fluorescentního čidla prodan a laurdan v bublinách poly(.epsilon.-kaprolakton)-block-poly(ethylen oxidu) ve vodním roztoku s tetrahydrofuranem.
Trvalý link: http://hdl.handle.net/11104/0004887