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Interfacial interactions between amphiphilic cyclodextrins and physiologically relevant cations.

Alix Dubes1, Hélène Parrot-Lopez, Patrick Shahgaldian

  • 1Synthèse, Reconnaissance, Organisation Moléculaire et Biomoléculaire, CNRS UMR 5078, Université Claude Bernard Lyon 1, Bât J. Raulin, 43, Bd. du 11 novembre 1918, 69622 Villeurbanne cedex, France.

Journal of Colloid and Interface Science
|March 26, 2003
PubMed
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Amphiphilic cyclodextrins form solid lipid nanoparticles (SLNs) that resist aggregation in monovalent salts. Divalent salts induce flocculation in sulfated cyclodextrins, with effects varying by salt type and degree of sulfation.

Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Amphiphilic cyclodextrins are versatile molecules with potential applications in drug delivery and nanotechnology.
  • Understanding their self-assembly behavior, particularly in response to ionic environments, is crucial for designing functional nanomaterials.

Purpose of the Study:

  • To investigate the compression isotherms and self-assembly of acylated and sulfated cyclodextrins.
  • To determine the influence of monovalent and divalent salts on the stability and aggregation of cyclodextrin-based solid lipid nanoparticles (SLNs).

Main Methods:

  • Compression isotherm studies on water and salt subphases.
  • Observation of solid lipid nanoparticle (SLN) formation.
  • Atomic Force Microscopy (AFM) imaging of SLNs.

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Main Results:

  • Two amphiphilic cyclodextrin derivatives formed SLNs.
  • SLNs showed no aggregation in monovalent salts (up to 150 mM) for sulfated derivatives.
  • Divalent salts induced flocculation, with sensitivity dependent on the degree of sulfation (DS) and specific ion (Mg2+, Ca2+).

Conclusions:

  • Amphiphilic cyclodextrins can form stable SLNs.
  • The stability of SLNs is significantly influenced by the ionic strength and type of salt in the subphase.
  • Degree of sulfation plays a critical role in modulating the salt-induced aggregation of cyclodextrin-based nanoparticles.