MICRO-ELECTROPHORETIC MOBILITY STUDY OF THE INFLUENCE OF CHLORPROMAZINE HYDROCHLORIDE ON DIMYRSTOYLPHOSPHATIDYLCHOLINE LIPOSOMES IN DIFFERENT MEDIA

In this study, the possible influence of the model, cationic drug chlorpromazine hydrochloride (CPZ-HCl) concentration on the micro-electrophoretic mobility of neutral large multi-lamellar dimyrstoylphosphatidylcholine (DMPC) liposomes was investigated in various media at both 25^oC and 37^oC. In addition the effect CPZ-HCl concentration on the micro-electrophoretic mobility of both positively charged DMPC/stearyl amine (ST) liposomes and negatively charged DMPC/dicetyl phosphate (DCP) liposomes were also investigated. The effect of pH on the micro-electrophoretic mobility of neutral positively charged and negatively charged liposomes in the absence and presence of CPZ-HCl in water and in 0.1M KCl at 25^oCwere also studied. Lastly, the influence of CPZ-HCl at concentrations known to cause anesthesia, on the micro-electrophoretic mobility of neutral, positively charged and negatively charged liposomes in phosphate buffer (pH 7.4) at 37^oC was also investigated. Present study indicates that DMPC liposomes in water exhibited zero electrophoretic mobility over a wide pH range. DMPC liposomes acquired negative charges in 0.1M KCl, phosphate buffer (pH 6.0 and 7.4) and in human plasma (pH 7.4).  The addition of CPZ-HCl shifted the mobility of neutral, positive and negative charged DMPC liposomes towards positivity. Linear relationship were observed between the electrophoretic mobility of DMPC, DMPC /ST, and DMPC /DCP liposomes as a function of CPZ-HCl concentrations known to cause anesthesia.