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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembled stimuli-responsive polyrotaxane core-shell particles.

Blaise L Tardy1, Henk H Dam, Marloes M J Kamphuis

  • 1Department of Chemical and Biomolecular Engineering, The University of Melbourne , Victoria 3010, Australia.

Biomacromolecules
|December 17, 2013
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Summary
This summary is machine-generated.

Novel polyrotaxane (PRX) core-shell nanocarriers offer a promising platform for drug delivery. These biocompatible particles efficiently encapsulate and release therapeutic molecules in response to cellular triggers.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Core-shell nanocarriers are explored for drug delivery due to their size and drug-loading capacity.
  • Polyrotaxanes (PRXs) are supramolecular polymers with potential for nanocarrier fabrication.

Purpose of the Study:

  • To synthesize and characterize thermodynamically assembled polyrotaxane (PRX) core-shell nanocarriers.
  • To evaluate the drug encapsulation, release, and degradation properties of these nanocarriers.
  • To assess the biocompatibility of PRX core-shell nanocarriers for drug delivery applications.

Main Methods:

  • Formation of core-shell particles using polyrotaxanes (PRXs) with an alpha-cyclodextrin (αCD) core and poly(ethylene glycol) (PEG) corona.
  • Encapsulation of small organic molecules (pyrene, calcein) within the PRX core.
  • Degradation studies using glutathione to trigger reductive cleavage of disulfide bonds.
  • Cytotoxicity assays using mammalian cells.

Main Results:

  • Successfully formed PRX core-shell nanocarriers with submicrometer dimensions.
  • Demonstrated sequestration and triggered release of small organic molecules.
  • Achieved particle degradation via glutathione-induced cleavage of disulfide bonds.
  • Exhibited negligible cytotoxicity in mammalian cells.

Conclusions:

  • Thermodynamically assembled PRX core-shell nanocarriers are effective for encapsulating and releasing small molecules.
  • The nanocarriers are highly responsive to glutathione, enabling triggered degradation.
  • These biocompatible nanocarriers show significant promise for future drug delivery research.