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Interaction between covalent DNA gels and a cationic surfactant.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Costa, Diana Hansson, Per Schneider, Stefanie Miguel, M. Graça Lindman, Björn |
| Copyright Year | 2006 |
| Abstract | The interaction of covalently cross-linked double-stranded (ds) DNA gels and cetyltrimethylammonium bromide (CTAB) is investigated. The volume transition of the gels that follows the absorption of the oppositely charged surfactant from aqueous solution is studied. As do other polyelectrolyte networks, DNA networks form complexes with oppositely charged surfactant micelles at surfactant concentrations far below the critical micelle concentration (cmc) of the polymer-free solution. The size of the absorbed surfactant aggregates is determined from time-resolved fluorescence quenching (TRFQ). At low surfactant concentrations, small discrete micelles (160 < N < 210) are found, whereas large micelles (N > 500) form at surfactant concentrations of 1 mM. When the DNA is in excess of the surfactant, the surfactant binding is essentially quantitative. The gel volume decreases by 90% when the surfactant to DNA charge ratio, beta, increases from 0 to 1. |
| Starting Page | 1443 |
| Ending Page | 1443 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://juser.fz-juelich.de/record/51297/files/80482.pdf |
| PubMed reference number | 16602725v1 |
| Volume Number | 7 |
| Issue Number | 4 |
| Journal | Biomacromolecules |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | CETRIMONIUM BROMIDE Charge (electrical) Covalent Interaction DNA Breaks, Double-Stranded Fluorescence Gel Polymers |
| Content Type | Text |
| Resource Type | Article |
