@inbook{79b8643b9a10457a8ed54bffd77db79c,
title = "DNA complexes with cationic surfactant in mixed solvents: The influence of excess surfactant and salt",
abstract = "We have investigated the solubility, thermal stability and structural transitions of DNA complexed with the cationic surfactant dodecyltrimethylammonium bromide (DTAB). The study was done over a broad range of ethanol/water mixtures. The dependence of solubility on surfactant and salt concentration was studied. For low salt concentrations, it was found that DNA-DTA complexes are soluble at an ethanol content higher then 57% v/v; however, addition of excess DTAB increases the ethanol concentration at which the complexes begin to solubilise. At higher ethanol concentrations (about 80% v/v) DNA-DTA complexes were soluble over the entire range of DTAB concentrations investigated. Also at higher ethanol concentrations it was found that the DNA underwent a helix-coil transition. Circular dichroism data indicated that excess surfactant inhibited the B-to-A transition. In the presence of 5 mM NaBr, the DNA was found to be insoluble in the high-ethanol region, while the surfactant-dependent solubility line was shifted to lower ethanol concentrations. We present the phase diagram describing the solubility and conformational state of the DNA-DTA complex and discuss the influence salt has on its stability and solubility.",
keywords = "DNA-dodecyltrimethylammonium, DNA-surfactant complex A-B transition",
author = "McLoughlin, {D. M.} and McManus, {J. J.} and Gorelov, {A. V.} and Dawson, {K. A.}",
year = "2000",
language = "English",
volume = "115",
series = "Progress in Colloid and Polymer Science",
publisher = "D. Steinkopff-Verlag",
pages = "186--191",
booktitle = "Progress in Colloid and Polymer Science",
}