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Enhanced Oil Recovery using a Combination of Biosurfactants
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Protein binding onto surfactant-based synthetic vesicles.

Caterina Letizia1, Patrizia Andreozzi, Anita Scipioni

  • 1Department of Chemistry, SOFT-INFM-CNR Research Centre, La Sapienza University, P. le A. Moro 5, I-00185 Rome, Italy.

The Journal of Physical Chemistry. B
|January 26, 2007
PubMed
Summary

This study details the creation of negatively charged synthetic vesicles and their interaction with lysozyme to form lipoplexes. Key findings show that protein binding neutralizes vesicle charge, influencing lipoplex stability and structure, with enthalpy driving the interactions.

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Area of Science:

  • Colloid and Surface Chemistry
  • Biophysical Chemistry
  • Materials Science

Background:

  • Synthetic vesicles are crucial for drug delivery and biomimetic studies.
  • Understanding protein-vesicle interactions is key to designing stable lipoplexes.
  • Surfactant mixtures offer tunable properties for vesicle formation.

Purpose of the Study:

  • To synthesize and characterize negatively charged synthetic vesicles using anionic and cationic surfactants.
  • To investigate the binding interactions between these vesicles and lysozyme.
  • To determine the structural and thermodynamic consequences of protein adsorption on vesicle properties.

Main Methods:

  • Vesicle preparation via controlled surfactant ratios (sodium dodecylsulfate with didodecyltrimethylammonium bromide or cetyltrimethylammonium bromide).
  • Characterization using dynamic light scattering (DLS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), and electrophoretic mobility.
  • Interaction studies employing surface tension, solution calorimetry, circular dichroism (CD), and dielectric relaxation.

Main Results:

  • Stable, negatively charged, unilamellar vesicles were successfully synthesized.
  • Lysozyme binding to vesicles led to charge neutralization, lipoplex flocculation, and changes in vesicle size and surface charge density.
  • Protein conformation remained largely native, with enthalpic contributions dominating system stability upon charge neutralization.

Conclusions:

  • The charge ratio of protein to vesicle dictates the extent of binding and lipoplex aggregation.
  • Enthalpy is the primary driving force for lysozyme-vesicle complex formation.
  • These findings provide insights into the design of stable protein-lipid complexes for potential applications.