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Related Concept Videos

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

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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...
26
Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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: Rate-Programmed I01:22

Modified-Release Drug Delivery Systems: Rate-Programmed I

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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
26
Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

29
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.
29
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

41
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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Modified-Release Drug Delivery Systems: Drug Release Characteristics01:22

Modified-Release Drug Delivery Systems: Drug Release Characteristics

44
Drug release from modified-release dosage forms is designed to achieve specific therapeutic effects by controlling the rate and extent of drug release. The classification of these drug release systems is based on key pharmacokinetic assumptions: drug disposition follows first-order kinetics, drug release is the rate-limiting step in absorption, and the released drug is rapidly and completely absorbed.There are four major models of drug release patterns. The first model is the slow zero-order...
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Related Experiment Video

Updated: Feb 19, 2026

Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization
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pH-Responsive Porous Nanocapsules for Controlled Release.

Jun Song1,2,3,4, Yanlong Wei1,2,3,4, Jiwen Hu1,2,3,4

  • 1Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, 510650, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 31, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed pH-responsive porous nanocapsules using a novel ternary graft copolymer. These nanocapsules enable controlled release of encapsulated substances, showing promise for drug delivery and catalysis.

Keywords:
drug deliverygraft copolymersnanostructuresself-assemblyvesicles

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Stimuli-responsive materials are crucial for advanced applications.
  • Designing complex nanostructures with tunable properties remains a challenge.

Purpose of the Study:

  • To synthesize and characterize novel pH-responsive porous nanocapsules.
  • To investigate the self-assembly behavior and stimuli-responsive release mechanism of these nanocapsules.

Main Methods:

  • Fabrication of ternary graft copolymers using click chemistry.
  • Self-assembly of copolymers into vesicles in a DMF/water mixture.
  • Photo-cross-linking to stabilize the vesicle structure.
  • pH-triggered release studies using pyrene as a model cargo.

Main Results:

  • Successfully prepared pH-responsive porous nanocapsules from PGMA-g-(PCEMA-r-MPEG-r-PDEAEMA).
  • Vesicles formed with a PCEMA wall and embedded PDEAEMA domains, stabilized by MPEG corona.
  • Photo-cross-linking locked the structure, while pH decrease induced porosity and cargo release.
  • Demonstrated potential for drug delivery, detection, and catalysis.

Conclusions:

  • The developed nanocapsules offer a new platform for stimuli-responsive systems.
  • The strategy provides a novel paradigm for designing other advanced porous nanocapsules.
  • These findings open avenues for innovative applications in nanomedicine and beyond.