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Layer-by-layer self-assembled polyelectrolyte multilayers with embedded liposomes: immobilized submicronic reactors

Marc Michel1, Youri Arntz, Guillaume Fleith

  • 1Centre National de la Recherche Scientifique, Institut Charles Sadron, Unité Propre 22 du CNRS, 6 rue Boussingault, 67083 Strasbourg Cedex, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 24, 2006
PubMed
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This study embeds enzyme-containing vesicles within polyelectrolyte films to create nanoreactors. These nanoreactors successfully precipitate calcium phosphates within confined spaces, demonstrating potential for active nanodevice development.

Area of Science:

  • Nanotechnology
  • Materials Science
  • Biochemistry

Background:

  • Phospholipid vesicles can be integrated into polyelectrolyte films without rupture.
  • Nanospaces are crucial for developing active nanodevices, especially in nanofluidics.

Purpose of the Study:

  • To utilize phospholipid vesicles as "embedded submicronic reactors" for calcium phosphate precipitation.
  • To investigate enzymatic reactions within confined vesicle spaces inside polyelectrolyte films.

Main Methods:

  • Large unilamellar vesicles (LUVs) were prepared containing calcium ions, spermine, and alkaline phosphatase.
  • Vesicles were embedded in poly-L-glutamic acid/poly(allylamine) (PGA/PAH) films, stabilized with poly-(D-lysine).
  • Calcium phosphate precipitation was induced by contacting the film with paranitrophenyl phosphate solution.

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Main Results:

  • Infrared spectroscopy confirmed calcium phosphate growth within the embedded vesicles.
  • Scanning near-field fluorescence microscopy indicated enzyme localization inside the vesicles.
  • Atomic force microscopy revealed inorganic platelets formed within vesicle-sized volumes.

Conclusions:

  • Enzyme-encapsulated vesicles within polyelectrolyte films act as effective nanoreactors for biomineralization.
  • This system demonstrates controlled precipitation of calcium phosphates in confined nanospaces.
  • The findings support the development of active nanodevices utilizing embedded enzymatic reactions.