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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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| Published in: | The Journal of chemical physics 2014-01, Vol.140 (4), p.044906-044906 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
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| cites | cdi_FETCH-LOGICAL-c313t-3880b670ec262526dce4d71f67b2928c4d537e2eaa8d6b0c88be864f70b45f063 |
| container_end_page | 044906 |
| container_issue | 4 |
| container_start_page | 044906 |
| container_title | The Journal of chemical physics |
| container_volume | 140 |
| creator | Zakrevskyy, Yuriy Roxlau, Julian Brezesinski, Gerald Lomadze, Nino Santer, Svetlana |
| description | 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. |
| doi_str_mv | 10.1063/1.4862678 |
| format | article |
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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. 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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. 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| ispartof | The Journal of chemical physics, 2014-01, Vol.140 (4), p.044906-044906 |
| issn | 0021-9606 1089-7690 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_1654702084 |
| source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP Journals (American Institute of Physics) |
| 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 |
| title | Photosensitive surfactants: micellization and interaction with DNA |
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