DNA with double-chained amphiphilic counterions and its interaction with lecithin.

Research output: Contribution to journalArticle

Standard

DNA with double-chained amphiphilic counterions and its interaction with lecithin. / Krivtsov, Alexey; Bilalov, Azat; Olsson, Ulf; Lindman, Björn.

In: Langmuir, Vol. 28, No. 38, 2012, p. 13698-13704.

Research output: Contribution to journalArticle

Harvard

APA

CBE

MLA

Vancouver

Author

Krivtsov, Alexey ; Bilalov, Azat ; Olsson, Ulf ; Lindman, Björn. / DNA with double-chained amphiphilic counterions and its interaction with lecithin. In: Langmuir. 2012 ; Vol. 28, No. 38. pp. 13698-13704.

RIS

TY - JOUR

T1 - DNA with double-chained amphiphilic counterions and its interaction with lecithin.

AU - Krivtsov, Alexey

AU - Bilalov, Azat

AU - Olsson, Ulf

AU - Lindman, Björn

PY - 2012

Y1 - 2012

N2 - Complex salts of double-stranded DNA with amphiphilic counterions offer novel opportunities for studies of DNA-lipid interactions. Here the effect of the hydrophobicity of the amphiphilic counterion is in focus. For this purpose, double stranded DNA with didodecyldimethylammonium ions as counterions, DDADNA, is prepared and investigated with respect to microstructure. In particular, in order to monitor the interactions with phospholipids, the phase diagram of the DDADNA/lecithin/water system is determined and compared with the previously determined phase diagram with single alkyl chain counterions, dodecyltrimethylammonium, DTA. In both systems, there is a formation of lamellar and reverse hexagonal phases, where hydrated DNA is sandwiched between bilayers or forms the core of reverse cylindrical micelles, respectively. However, whereas the lecithin lamellar phase can incorporate large amounts of DDADNA, there is in the case of the single chain surfactant, DTADNA, a transition to a bicontinuous cubic phase at higher DTADNA concentrations. The general appearance of the phase diagrams, and in particular the role of counterion hydrophobicity, can be rationalized in a simple geometric model.

AB - Complex salts of double-stranded DNA with amphiphilic counterions offer novel opportunities for studies of DNA-lipid interactions. Here the effect of the hydrophobicity of the amphiphilic counterion is in focus. For this purpose, double stranded DNA with didodecyldimethylammonium ions as counterions, DDADNA, is prepared and investigated with respect to microstructure. In particular, in order to monitor the interactions with phospholipids, the phase diagram of the DDADNA/lecithin/water system is determined and compared with the previously determined phase diagram with single alkyl chain counterions, dodecyltrimethylammonium, DTA. In both systems, there is a formation of lamellar and reverse hexagonal phases, where hydrated DNA is sandwiched between bilayers or forms the core of reverse cylindrical micelles, respectively. However, whereas the lecithin lamellar phase can incorporate large amounts of DDADNA, there is in the case of the single chain surfactant, DTADNA, a transition to a bicontinuous cubic phase at higher DTADNA concentrations. The general appearance of the phase diagrams, and in particular the role of counterion hydrophobicity, can be rationalized in a simple geometric model.

U2 - 10.1021/la302720d

DO - 10.1021/la302720d

M3 - Article

VL - 28

SP - 13698

EP - 13704

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 38

ER -