The interaction between DNA and cationic lipid films at the air–water interface

Adsorption of DNA to octadecylamine monolayers at the air–water interface

“…These results prove the effective adsorption of polynucleotides to the lipid monolayer and the formation of mixed monolayers of both components. This work not only supports the previous assumption that the adsorption process is governed by an electrostatic interaction between phosphate groups of DNA molecules and the positively charged ODA [54], but also provides new insight into such interaction, based on BAM measurements. In particular, different types of DNA adsorption and its behavior under compression (DNA folding, squeezing out or multilayer formation) are proposed.…”

Memory effects of monolayers and vesicles formed by the non-ionic surfactant, 2C18E12

“…Upon compression, more domains were clear and the mobility of the film decreased. Similar images have been obtained for DSPC when spread on low concentrations of electrolyte [18,19]. No hysteresis of the DSPC film was observed upon expansion of the film.…”

Hydrodynamic size of DNA/cationic gemini surfactant complex as a function of surfactant structure

“…Above the critical aggregate concentration, cooperative binding of surfactant on DNA occurs which leads to the formation of thick surface layers (McLoughlin and Langevin 2004). For the DNA complex with dioctadodecyltrimethylammonium bromide (one head, two alkyl chains) at the air/water interface, the surface pressure vs. area isotherm of the cationic monolayer is shifted to larger molecular areas and the transition between liquid expanded and liquid condensed state of the monolayer disappears upon the addition of DNA (Cárdenas et al 2005a). …”