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Tocopheryl Succinate-Induced Structural Changes in DPPC Liposomes: DSC and ANS Fluorescence Studies.

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Alpha-tocopheryl succinate (TS) disrupts dipalmitoylphosphatidylcholine (DPPC) liposomes, altering membrane structure and physico-chemical properties. These findings reveal TS

Keywords:
ANS fluorescenceDPPC liposomedifferential scanning calorimetrymembrane permeationphase transitiontocopheryl succinate

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Area of Science:

  • Biophysics
  • Materials Science
  • Pharmacology

Background:

  • Alpha-tocopheryl succinate (TS) demonstrates selective toxicity towards cancer cells.
  • Understanding TS's interaction with lipid membranes is crucial for its therapeutic applications.

Purpose of the Study:

  • To investigate the impact of TS on the physico-chemical and structural properties of dipalmitoylphosphatidylcholine (DPPC) liposomes.
  • To elucidate the mechanism of TS-induced membrane disruption.

Main Methods:

  • Fluorescence spectroscopy using 1-anilino-8-naphtalene sulphonate (ANS).
  • Differential scanning calorimetry (DSC).
  • Zeta potential measurements.

Main Results:

  • TS incorporation into DPPC liposomes induced changes in membrane fluidity and structure.
  • ANS fluorescence parameters indicated increased disorder and a shift towards a more aqueous environment within the membrane.
  • DSC revealed the formation of intermediate structures during liposome melting.
  • Zeta potential measurements showed an increased negative surface charge.

Conclusions:

  • TS destabilizes DPPC liposome structure, leading to membrane disruption.
  • The observed biophysical changes confirm TS's interaction with and alteration of lipid membrane properties.
  • These findings provide insights into the mechanism underlying TS's selective toxicity.