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Counterion Effects on Interaction of Amphiphilic Quaternary Ammonium Salts with Model Membranes

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Counterion Effects on Interaction of Amphiphilic Quaternary Ammonium Salts with Model Membranes

Boz˙enna Ro´z˙ycka-Roszak*, Romuald Z ˙ yłka, Teresa Kral and Adriana Przyczyna

Agricultural University, Department of Physics and Biophysics, Norwida 25,

50Ð375 Wrocław, Poland. Fax: +4871 3205172. E-mail: Boro@ozi.ar.wroc.pl

* Author for correspondence and reprint requests

Z. Naturforsch.56 c,407Ð412 (2001); received December 4, 2000/January 24, 2001 Counterions, Model Membranes, Micellization

The micellization as well as the interaction with model membranes of dodecyltrimethylam- monium halides (DTAX) and N-dodecyl-N,N-dimethyl-N-benzylammonium halides (DBeAX) were studied at 298K and 313K by means of titration calorimetry. The calorimetric curves reflect both the counterion and benzyl group effects on the interaction of the surfac- tants studied with the lipid bilayer. Bromide as counterion enhanced the interactions more than chloride of both DTAX and DBeAX compounds with model membranes.

Further, we studied the influence of DTAX and DBeAX on calcium ion desorption from the liposome membrane using a radioactive tracer method. DBeAX proved more efficient in desorption of calcium than DTAX. Iodides of these compounds enhanced this process more than bromides and chlorides.

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