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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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 called...

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Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Molecular structure of physiologically-responsive hydrogels controls diffusive behavior.

Daniel A Carr1, Nicholas A Peppas

  • 1Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.

Macromolecular Bioscience
|November 20, 2008
PubMed
Summary
This summary is machine-generated.

Novel polymeric hydrogels made from methacrylic acid (MAA) and N-vinylpyrrolidone (NVP) show promise as pH-responsive drug delivery carriers. Their tunable swelling properties facilitate efficient drug diffusion for targeted therapeutic applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Polymeric hydrogels are widely investigated for drug delivery applications.
  • Developing pH-responsive carriers is crucial for targeted drug release in specific physiological environments.
  • Methacrylic acid (MAA) and N-vinylpyrrolidone (NVP) are common monomers for synthesizing functional hydrogels.

Purpose of the Study:

  • To synthesize and characterize poly(MAA-co-NVP) hydrogels.
  • To evaluate their potential as carriers for directed drug delivery.
  • To understand the influence of MAA and NVP on hydrogel properties and drug release.

Main Methods:

  • UV-initiated free radical polymerization for hydrogel synthesis.
  • FT-IR spectroscopy to analyze functional groups and hydrogen bonding.
  • Scanning Electron Microscopy (SEM) for surface morphology assessment.
  • Dynamic pH swelling studies and equilibrium swelling measurements.

Main Results:

  • Successful synthesis of poly(MAA-co-NVP) polymeric networks and hydrogels.
  • FT-IR confirmed hydrogen bonding complex formation.
  • SEM revealed that comonomer ratios influence microparticle surface morphology.
  • Hydrogels exhibited pH-responsive swelling, with higher MAA concentrations increasing complexation in gastric conditions.
  • NVP enhanced hydrogel swelling, and equilibrium swelling indicated a mesh size suitable for drug diffusion.

Conclusions:

  • Synthesized poly(MAA-co-NVP) hydrogels are effective pH-responsive drug delivery carriers.
  • The composition of MAA and NVP can be tuned to control swelling and drug diffusion.
  • These hydrogels demonstrate significant potential for targeted drug delivery systems.