Repozytorium
Wyszukaj
Kolekcje
Inne
Structural aspects in saccharide-derived micelles studied by a spin probe technique.
Autorzy
Rok wydania
2009
Czasopismo
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Numer woluminu
343
Strony
64-69
DOI
10.1016/j.colsurfa.2009.01.030
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Electron paramagnetic resonance spectroscopy (EPR) was used in this study to monitor micellization behavior of selected saccharide-derived surfactants in aqueous solutions by measuring the spin probe parameters of nitroxide labeled entities (5- and 16-doxylstearic acid methyl esters) as a function of temperature and surfactant concentration. A group of aldonamide-type surfactants of the following architecture was selected: a single-head single-tail structure (i.e., N-dodecyl-N-methylgluconamide—C12MGA), a dicephalic representative (i.e., N-dodecyl-N,N-bis[3-d-gluconyl-amido)propyl]amine—C12DGA and N-dodecyl-N,N-bis[3-d-lactobionylamido)propyl]amine—C12DLA) and gemini one (i.e., N,N′-bisdodecyl-N,N′-bis[(3-d-gluconyl-amide)propyl]ethylenediamine—bis(C12GA)). The anisotropy effect in the EPR spectra proved that molecules of the used spin probes penetrate effectively the studied micelles. Taking into account that the rotational correlation time magnitude correlated well with the probe mobility, the structure of formed aggregates and their microviscosity were achieved. It was found that the calculated values of rotational correlation times were relatively high and indicated large inhibition of rotations of the studied nitroxide probe molecules. The microviscosity of micelles increased slightly with the increase in surfactant concentration. Slope coefficients of the obtained temperature dependences under the studied concentration range were almost the same for both spin probes indicating the spherical shape of the aggregates. Our results show effectiveness of EPR technique for investigations of micelle formation and their molecular microenvironment.
Słowa kluczowe
Sugar surfactants, Micelles, Electron paramagnetic resonance, Spin probe, Correlation time
Adres publiczny
https://doi.org/10.1016/j.colsurfa.2009.01.030
Strona internetowa wydawcy
Podobne publikacje
Characterization of the microenvironments of alkylamidoamine-N-oxide surfactant aggregates by the EPR spin labeling method.
Lewińska Agnieszka, Wilk Kazimiera A., Jezierski Adam
Aggregation behavior of dicephalic di-N-oxide surfactants in aqueous solution: experimental and computational approaches.
Lewińska Agnieszka, Witwicki Maciej, Bazylińska Urszula, Jezierski Adam, Wilk Kazimiera A.
Attaching a spin to a protein - site-directed spin labeling in structural biology.
Czogalla Aleksander, Pieciul Aldona, Jezierski Adam, Sikorski Aleksander F.