Photosensitive surfactants: micellization and interaction with DNA

Recently, photosensitive surfactants have re-attracted considerable attention. It has been shown that their association with oppositely charged biologically important polyelectrolytes, such as DNA or microgels, can be efficiently manipulated simply by light exposure. In this article, we investigate...

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Bibliographic Details
Published in:The Journal of chemical physics 2014-01, Vol.140 (4), p.044906-044906
Main Authors: Zakrevskyy, Yuriy, Roxlau, Julian, Brezesinski, Gerald, Lomadze, Nino, Santer, Svetlana
Format: Article
Language:English
Subjects:
Agglomeration
Animals
Azo Compounds - chemistry
Calorimetry
Cattle
Deoxyribonucleic acid
DNA
DNA - chemistry
Enthalpy
Entropy
Micelles
Microgels
Models, Chemical
Osmolar Concentration
Photochemical Processes
Photosensitivity
Physics
Polyelectrolytes
Self-assembly
Spectroscopy
Spectrum Analysis
Surface-Active Agents - chemistry
Surfactants
Temperature
Thymus Gland
Titration
Visible spectrum
Water - chemistry
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Summary:Recently, photosensitive surfactants have re-attracted considerable attention. It has been shown that their association with oppositely charged biologically important polyelectrolytes, such as DNA or microgels, can be efficiently manipulated simply by light exposure. In this article, we investigate the self-assembly of photosensitive surfactants as well as their interactions with DNA by calorimetric and spectroscopic methods. Critical micelle concentration (CMC), standard micellization enthalpy, entropy, and Gibbs energy were determined in different conditions (ionic strengths and temperatures) for a series of cationic surfactants with an azobenzene group in their tail. It is shown, that aggregation forces of photosensitive units play an important role in the micellization giving the major contribution to the micellization enthalpy. The onset of the aggregation can be traced from shift of the absorption peak position in the UV-visible spectrum. Titration UV-visible spectroscopy is used as an alternative, simple, and sensitive approach to estimate CMC. The titration UV-visible spectroscopy was also employed to investigate interactions (CAC: critical aggregation concentration, precipitation, and colloidal stabilization) in the DNA-surfactant complex.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4862678