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DNA Phase Behavior in the Presence of Oppositely Charged Surfactants
Dias, Rita; Mel'nikov, Sergey; Lindman, Björn; Miguel, Maria G.The interaction between DNA and alkyltrimethylammonium bromides of various chain lengths has been investigated. It is known that these systems phase separate with the formation of a precipitate; this important feature allows, for example, purification of nucleic acids. Phase maps were drawn for the aqueous systems illustrating the associative phase separation. The boundary of the two-phase region for the dilute...
DNA conformational dynamics in the presence of catanionic mixtures
Mel'nikov, Sergey M.; Dias, Rita; Mel'nikova, Yuliya S.; Marques, Eduardo F.; Miguel, Maria G.; Lindman, BjörnDNA conformational behavior in the presence of non-stoichiometric mixtures of two oppositely charged surfactants, cetyltrimethylammonium bromide and sodium octyl sulfate, was directly visualized in an aqueous solution with the use of a fluorescence microscopy technique. It was found that in the presence of cationic-rich catanionic mixtures, DNA molecules exhibit a conformational transition from elongated coil t...
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