Interactions
of cationic surfactantswith DPPC |
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Authors: | M Kozak L Domka S Jurga |
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Institution: | (1) Department of Macromolecular Physics, A. Mickiewicz University, Poznań, Poland;(2) Department of Metalorganic Chemistry, A. Mickiewicz University, Poznań, Poland |
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Abstract: | The effects of different
cationic surfactants (n-undecylammonum chloride, UDACl and dodecyldimethyl
(dodecyloxymethyl) ammonium chloride, DDMDDACl) on fully hydrated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) vesicles have
been studied. In the studied systems the molar ratio (x)
of DPPC/surfactant ranged between x=0.0164–0.82
and from x=0.0352–1.76 for DPPC/DDMDDACl
and DPPC/UDACl, respectively. For both systems, the enthalpy associated with
the phase transition significantly decreases even at the lowest surfactant
concentration. Also the main phase transition temperature is shifted towards
lower temperatures.
The structural parameters of the phases have
been characterised by small angle X-ray scattering (SAXS). The SAXS results
have proved that UDACl at x=0.0352 molar
ratio significantly influences the DPPC lamellar structure, while its total
disappearance was observed for x=0.176.
The presence of DDMDDACl causes a total disappearance of the DPPC lamellar
structure already at the lowest molar ratio (x=0.0352).
Each surfactant in the system with DDPPC leads to a mixed micellar phase formation. |
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Keywords: | cationic surfactants 1 2-dipalmitoyl-sn-glycero-3-phosphocholine DPPC DSC phase transition phospholipids SAXS |
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