DNA and cationic surfactant complexes at hydrophilic surfaces. An ellipsometry and surface force study

Langmuir : the ACS Journal of Surfaces and Colloids
M CardenasBjörn Lindman

Abstract

The adsorption and formation of DNA and cationic surfactant complexes at the silica-aqueous interface have been studied by ellipsometry. The interaction between the DNA-surfactant complexes at the mica-aqueous interface has been determined by the interferometric surface force apparatus. Adsorption was as expected not observed on negatively charged hydrophilic surfaces for DNA and when DNA-cationic surfactant complexes were negatively charged. However, adsorption was observed when there is an excess of cationic surfactant, just below the point of phase separation. The adsorption process requires hours to reach steady state. The adsorbed layer thickness is large at low surface coverage but becomes more compact and thinner at high coverage. A long-range repulsive force was observed between adsorbed layers of DNA-cationic surfactant complexes, which was suggested to be of both electrostatic and steric origin. The forces were found to be dependent on the equilibration time and the experimental pathway.

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Citations

Jan 27, 2012·Chemical Reviews·Francisco Zaera
Aug 31, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Marité CárdenasTommy Nylander
Nov 4, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Maria WadsäterMarité Cárdenas
Nov 5, 2013·Advances in Colloid and Interface Science·Maura MonduzziAndrea Salis
Jul 17, 2007·Journal of Colloid and Interface Science·Xiaofang ZhaoYing Hu
Apr 26, 2005·Journal of Colloid and Interface Science·Marité CárdenasBjörn Lindman
Dec 29, 2009·Biochimica Et Biophysica Acta·Agnes MichanekEmma Sparr
Feb 14, 2015·Scientific Reports·Yajing KanYunfei Chen
Jun 11, 2005·The Journal of Chemical Physics·Ajay S Panwar, Satish Kumar
Oct 7, 2005·Chemistry and Physics of Lipids·Mandeep Singh BakshiGurinder Kaur
Jun 29, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Marité CárdenasBjörn Lindman
Jan 29, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·J ZhangJ Penfold
Oct 20, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Lubica MacakovaPer M Claesson
Aug 2, 2006·Advances in Colloid and Interface Science·Sudam K ParidaB K Mishra
Jun 28, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Lu SunBjörn Akerman
Jan 21, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Qibin ChenYing Hu

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