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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...
Phase I Reactions: Reductive Reactions01:27

Phase I Reactions: Reductive Reactions

Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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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Related Experiment Video

Updated: Jun 25, 2026

The Use of the Ex Vivo Chandler Loop Apparatus to Assess the Biocompatibility of Modified Polymeric Blood Conduits
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Published on: August 20, 2014

Reduction-sensitive polymers and bioconjugates for biomedical applications.

Fenghua Meng1, Wim E Hennink, Zhiyuan Zhong

  • 1Biomedical Polymers Laboratory and Jiangsu Key Laboratory of Organic Chemistry, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Ren-Ai Road 199, Suzhou 215123, PR China.

Biomaterials
|February 10, 2009
PubMed
Summary
This summary is machine-generated.

Biodegradable polymers with disulfide bonds degrade in reductive intracellular environments. These reduction-sensitive materials offer targeted delivery of gene and drug therapies, showing great promise for advanced biomedical applications.

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Last Updated: Jun 25, 2026

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Area of Science:

  • Biomedical Engineering
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Reduction-sensitive biodegradable polymers and conjugates are key for intracellular triggered delivery.
  • Disulfide linkages are commonly incorporated into these materials for controlled degradation.

Purpose of the Study:

  • To review recent advances in reduction-sensitive biodegradable polymers and conjugates.
  • To highlight their design, chemistry, and applications in drug and gene delivery.

Main Methods:

  • Review of literature on reduction-sensitive delivery systems.
  • Focus on design strategies and chemical incorporation of disulfide bonds.
  • Analysis of various delivery platforms like liposomes, polymersomes, and nanoparticles.

Main Results:

  • Reduction-sensitive polymers exhibit stability in circulation and rapid degradation intracellularly.
  • These materials enable controlled cytoplasmic delivery of DNA, siRNA, proteins, and drugs.
  • Diverse systems including micelles, gels, nanotubes, and films have been developed.

Conclusions:

  • Reduction-sensitive biodegradable polymers are highly promising biomaterials.
  • They possess significant potential for sophisticated drug and gene delivery systems.
  • Their unique properties facilitate targeted intracellular therapeutic agent release.