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Journal of Thermal Analysis and Calorimetry

, Volume 120, Issue 1, pp 937–945 | Cite as

The metastable phases as modulators of biophysical behavior of liposomal membranes

The role of biomolecular sculpture of polymeric guest
  • Natassa Pippa
  • Stergios Pispas
  • Costas DemetzosEmail author
Article

Abstract

In this work, we investigate the alterations of the physicochemical, morphological, and thermotropic characteristics of conventional, stealth, and chimeric DPPC (dipalmitoylphosphatidylcholine) liposomes, caused by the incorporation of PEGylated lipid and block copolymers with different architectures and compositions. 1,2-Dipalmitoyl-sn-glycero-3-phosphoethanolamine-N-[Methoxy(Polyethylene glycol)-3000] (DPPE-PEG 3000) is the PEGylated lipid, poly(ethylene oxide)-block-poly(ε-caprolactone) (PEO-b-PCL) is the block copolymer, and poly(2-methyl-2-oxazoline)-grad-poly(2-phenyl-2-oxazoline) (MPOx) is the gradient block copolymer, which are selected for preparing the liposomal systems. Light scattering techniques and differential scanning calorimetry (DSC) were used in order to extract information on the physicochemical/thermodynamic balance of the prepared liposomal systems. The physicochemical characteristics and the morphology via fractal analysis of these chimeric nanoassemblies were found to depend on the composition of the polymeric component, while DPPC liposomes were used for comparison reasons (reference system). The incorporation of polymeric components into liposomes promotes a structural rearrangement of lipid bilayers and affects their behavior, as DSC experiments indicated. The fluidity, the intervesicle interactions and the cooperativity of structural elements of liposomes were also changed significantly by polymer addition. It could be concluded that the different macromolecular architectures of the polymeric guest affect the thermotropic behavior of liposomal membrane by producing new metastable phases, and consequently promote new insights in the field of biophysical concept for designing and developing chimeric advanced drug delivery nano systems (aDDnSs).

Keywords

Block copolymers Gradient copolymers Chimeric liposomes Differential scanning calorimetry Interdigitation Metastable phase 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • Natassa Pippa
    • 1
    • 2
  • Stergios Pispas
    • 2
  • Costas Demetzos
    • 1
    Email author
  1. 1.Department of Pharmaceutical Technology, Faculty of PharmacyUniversity of AthensAthensGreece
  2. 2.Theoretical and Physical Chemistry InstituteNational Hellenic Research FoundationAthensGreece

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