Abstract
AbstractPaclitaxel is an effective anticancer drug. Recently, paclitaxel encapsulated in liposomes was promoted as a better tolerated pharmaceutical formulation than that currently in use. The data presented in this study show the effects of paclitaxel on phospholipid bilayers. Experiments involving the phospholipid head group probe CAT-16 show significant disordering of the interfacial region. The pretransition was abolished and the main phase transition temperature in paclitaxel loaded liposomes was reduced. 2T II values of 7-NSA and 16-NSA spin probes reporting from the middle and from the core of the phospholipid bilayer, respectively, show that the presence of paclitaxel eliminated the pretransition (from Lβ/ to Pβ/) while inducing a slight reduction in the main (Pβ/ to Lα) phase transition temperature; in the same temperature interval, the central resonance line width δ H O displayed a greater rate of spin label reorientation in paclitaxel loaded bilayers. Further data are presented clearly demonstr...
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