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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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

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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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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Modified-Release Drug Delivery Systems: Classification01:23

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Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
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Related Experiment Video

Updated: Mar 21, 2026

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Enzyme-responsive polymer hydrogels for therapeutic delivery.

Rona Chandrawati1

  • 1School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia rona.chandrawati@sydney.edu.au.

Experimental Biology and Medicine (Maywood, N.J.)
|May 19, 2016
PubMed
Summary

Enzyme-responsive polymer hydrogels offer precise control over therapeutic delivery. This review covers recent advances in enzyme-catalyzed reactions for drug release, highlighting applications and future directions.

Keywords:
Biomaterialsdrug deliveryenzyme-responsiveglycosidasehydrogelsprotease

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Enzymes are crucial for physiological processes; altered levels link to diseases.
  • Enzymes can act as biological triggers to control material responses and biomolecule release.
  • Enzyme-responsive materials offer targeted therapeutic delivery potential.

Purpose of the Study:

  • To review enzyme-responsive polymer hydrogels for therapeutic delivery applications.
  • To focus on protease- and glycosidase-based systems developed in the last five years.
  • To discuss strategies, applications, and future challenges in this field.

Main Methods:

  • Literature review of enzyme-responsive polymer hydrogels.
  • Focus on protease- and glycosidase-catalyzed reactions.
  • Analysis of material design strategies and drug delivery applications.

Main Results:

  • Recent advancements in enzyme-responsive hydrogels for drug delivery.
  • Successful applications utilizing protease- and glycosidase-based catalysis.
  • Description of various strategies for creating responsive materials.

Conclusions:

  • Enzyme-responsive hydrogels show significant promise for controlled therapeutic delivery.
  • Further research is needed to overcome challenges and expand applications.
  • The field presents numerous opportunities for innovation in biomaterials and medicine.