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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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Dual-stimuli-responsive microparticles.

Ekaterina Sokolovskaya, Sahar Rahmani1, Asish C Misra1

  • 1‡Biointerfaces Institute and Departments of Biomedical Engineering and Chemical Engineering, University of Michigan 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States.

ACS Applied Materials & Interfaces
|April 19, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel dual-stimuli-responsive polymer for biotechnology. This smart material degrades only when exposed to both UV light and oxidative stress, enabling selective applications.

Keywords:
anisotropic particleselectrohydrodynamic cojettingmicroparticlesmultifunctional poly(ethylene glycol)stimuli responsive materials

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Materials Science

Background:

  • Stimuli-responsive polymers are crucial in biotechnology.
  • Existing polymers often respond to single stimuli (pH, light, temperature, oxidative stress).
  • There is a need for advanced materials responding to multiple stimuli.

Purpose of the Study:

  • To synthesize a novel dual-stimuli-responsive polymer based on poly(ethylene glycol).
  • To investigate the polymer's response to UV light (exogenous) and oxidative stress (endogenous) stimuli.
  • To fabricate and evaluate smart microparticles and fibers from this polymer.

Main Methods:

  • Synthesis of a novel poly(ethylene glycol)-based dual-stimuli-responsive polymer.
  • Fabrication of microparticles and fibers from the synthesized polymer.
  • Examination of material responses to UV light and oxidative stress, individually and combined.
  • Analysis of degradation kinetics and in vitro cell uptake.

Main Results:

  • The polymer exhibits dual-stimuli responsiveness, changing hydrophilic properties.
  • Selective degradation of microparticles and fibers occurred only upon combined UV light and oxidative stress treatment.
  • In vitro studies confirmed successful uptake of the particles by Raw 264.7 cells.

Conclusions:

  • A novel dual-stimuli-responsive polymer was successfully synthesized and characterized.
  • The developed smart microparticles and fibers demonstrate controlled degradation.
  • Potential applications in drug delivery, bioimaging, and tissue engineering are highlighted.