Reentrant phase transitions of DNA-surfactant complexes

Krishnaswamy, Rema ; Raghunathan, V. A. ; Sood, A. K. (2004) Reentrant phase transitions of DNA-surfactant complexes Physical Review E - Statistical, Nonlinear and Soft Matter Physics, 69 (3). 031905_1-031905_4. ISSN 1539-3755

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Complexes of double-stranded DNA with the cationic surfactant cetyltrimethylammonium bromide have been studied using small angle X-ray diffraction at varying concentrations of DNA and the cosurfactant hexanol. At low DNA concentrations, an intercalated hexagonal (HIc)→lamellar (Lαc)→inverted hexagonal (HIIc) transformation is found on increasing hexanol content. The HIIc structure is converted into Lαc on adding more DNA. Further increase in hexanol content leads to a phase separation in the surfactant solution, and a reentrant Lαc→HIIc→Lαc transition is observed as DNA concentration is increased. Such structural transformations of DNA-surfactant complexes, driven by DNA concentration, have not been reported until now.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:50248
Deposited On:22 Jul 2011 13:54
Last Modified:18 May 2016 04:37

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