Thermodynamic and infrared analyses of the interaction of chlorpromazine with phospholipid monolayers.
J Phys Chem B
; 110(39): 19637-46, 2006 Oct 05.
Article
en En
| MEDLINE
| ID: mdl-17004832
ABSTRACT
An investigation has been made of the interaction between chlorpromazine (CPZ) and monolayers of 1,2-dipalmitoyl-sn-3-glycerophosphatidylcholine (DPPC) and 1,2-dipalmitoyl-sn-3-glycero[phospho-rac-(1-glycerol)] (DPPG), both at the air/water interface and in transferred Langmuir-Blodgett films. The Gibbs free energy, DeltaG, and the compressibility modulus (C(S)(-1)), obtained from the surface pressure isotherms, indicated changes in the in-plane interactions of CPZ/DPPG mixed monolayers, with positive values of DeltaG. The arrangement of CPZ in the zwitterionic DPPC monolayers causes a weaker interaction in CPZ/DPPC mixed monolayers, with the DeltaG fluctuating around zero. IR measurements in transferred monolayers showed that CPZ did not affect the conformational order of the acyl chains, its effects being limited to the bands corresponding to the headgroups. Furthermore, since no shift was observed for the acyl chain bands, the phase transition induced by CPZ is not a liquid expanded (LE) to liquid condensed (LC) transition, as the latter is associated with chain ordering. Taken together, the IR and compressibility results demonstrate that the effect from CPZ cannot be correlated with temperature changes in the subphase for pure monolayers, in contrast to models proposed by other authors.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fosfolípidos
/
Espectrofotometría Infrarroja
/
1,2-Dipalmitoilfosfatidilcolina
/
Química Física
/
Clorpromazina
/
Antagonistas de Dopamina
/
Membrana Dobles de Lípidos
Tipo de estudio:
Risk_factors_studies
Idioma:
En
Revista:
J Phys Chem B
Asunto de la revista:
QUIMICA
Año:
2006
Tipo del documento:
Article