TY - JOUR
T1 - Analysis of adsorption of phospholipids at the 1,2-dichloroethane/water interface by electrochemical impedance spectroscopy
T2 - A study of the effect of the saturated alkyl chain
AU - Martins, M. C.
AU - Pereira, C. M.
AU - Santos, H. A.
AU - Dabirian, R.
AU - Silva, F.
AU - Garcia-Morales, V.
AU - Manzanares, J. A.
N1 - Funding Information:
Financial support from FCT for the project PRAXIS XXI/QUI/474 and from European Union under the research and training network SUSANA (“Supramolecular Self-Assembly of Interfacial Nanostructures”, Contract number HPRN-CT-2002-00185) is greatly acknowledged.
PY - 2007/1/15
Y1 - 2007/1/15
N2 - The adsorption behaviour of a series of phosphatidylcholines (PCs) with saturated carbon chains of different length (DLPC, DPPC, DSPC, DAPC, and DBPC) at the electrified 1,2-dichloroethane/water interface was studied by measuring electrochemical impedance spectroscopy at the polarized interface. Two different trends in the interfacial capacitance were observed for any of the PCs the capacity dependence on the applied potential: strong adsorption occurs at negative potential with a marked decrease of C(E); increase of capacity is observed at positive potentials. It is demonstrated that the interfacial lipid adsorption was dependent on phospholipid concentration, applied potential, and phospholipid chain length. The potential and concentration dependence of the interfacial capacitance in the presence of these phospholipids were successfully described by a model based on the solution of the Poisson-Boltzmann equation in the interfacial region.
AB - The adsorption behaviour of a series of phosphatidylcholines (PCs) with saturated carbon chains of different length (DLPC, DPPC, DSPC, DAPC, and DBPC) at the electrified 1,2-dichloroethane/water interface was studied by measuring electrochemical impedance spectroscopy at the polarized interface. Two different trends in the interfacial capacitance were observed for any of the PCs the capacity dependence on the applied potential: strong adsorption occurs at negative potential with a marked decrease of C(E); increase of capacity is observed at positive potentials. It is demonstrated that the interfacial lipid adsorption was dependent on phospholipid concentration, applied potential, and phospholipid chain length. The potential and concentration dependence of the interfacial capacitance in the presence of these phospholipids were successfully described by a model based on the solution of the Poisson-Boltzmann equation in the interfacial region.
KW - Electrochemical impedance spectroscopy
KW - Interfacial capacitance
KW - Liquid-liquid interface
KW - Phospholipid adsorption
UR - http://www.scopus.com/inward/record.url?scp=33845949034&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2006.07.022
DO - 10.1016/j.jelechem.2006.07.022
M3 - Article
AN - SCOPUS:33845949034
SN - 1572-6657
VL - 599
SP - 367
EP - 375
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -