Sphingolipid monolayers on the air-water interface and electrochemical behavior of the films transferred onto glassy carbon electrodes

N. WILKE, ; A.M.BARUZZI; B. MAGGIO.

AMER CHEMICAL SOC

Año: 2001 vol. 17 p. 3980 - 3980

n the present paper the packinganddipolar properties of dimirystoylphosphatidylcholineandsphingolipidmonolayers were studied at the air-water interface in correlation with the charge-transfer process of theK3Fe(CN)6/ K4Fe(CN)6 redox couple voltammetricaly analyzed on glassy carbon electrodes coated with thetransferred monolayers. Lipid molecules having in common the lipophilic chain or the polar group werechosen for the analysis. Different degrees of electrochemical irreversibility in the voltammetric profilewere observed depending on the lipid nature. The reversibility of the process was recovered after furtheraddition of calcium chloride to the solution under study, indicating an increase in the monolayer permeabilityand consequently an increase in the rate of the charge-transfer process. The necessary amount of calciumto produce this effect depended also on the nature of the monolayer, which was evidence of some specificinteract