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

Modified-Release Drug Delivery Systems: Rate-Programmed II

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...
Oral Drug Delivery Systems: Delayed-Release Systems01:11

Oral Drug Delivery Systems: Delayed-Release Systems

Delayed-release drug delivery systems are specialized pharmaceutical formulations designed to postpone the release of active compounds until the drug reaches a specific region of the gastrointestinal (GI) tract, typically the intestine. These systems are essential for drugs that may cause gastric irritation, are unstable in acidic environments, or need to exert therapeutic effects locally in the intestinal or colonic regions.The core feature of delayed-release systems is the use of enteric...
Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

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...
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...
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.

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Related Experiment Video

Updated: May 23, 2026

Manufacture and Drug Delivery Applications of Silk Nanoparticles
09:03

Manufacture and Drug Delivery Applications of Silk Nanoparticles

Published on: October 8, 2016

Polymers for drug delivery systems.

William B Liechty1, David R Kryscio, Brandon V Slaughter

  • 1Department of Chemical Engineering, University of Texas, Austin, TX 78712-1062, USA.

Annual Review of Chemical and Biomolecular Engineering
|March 22, 2012
PubMed
Summary
This summary is machine-generated.

Polymers enable advanced drug delivery systems, offering controlled release of therapeutics. Innovations in polymer design are crucial for targeted delivery and overcoming biological barriers.

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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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Last Updated: May 23, 2026

Manufacture and Drug Delivery Applications of Silk Nanoparticles
09:03

Manufacture and Drug Delivery Applications of Silk Nanoparticles

Published on: October 8, 2016

Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
07:32

Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

Published on: August 28, 2015

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Area of Science:

  • Polymer science and engineering
  • Biomaterials science
  • Pharmaceutical sciences

Background:

  • Polymers are essential for controlled drug delivery, enabling sustained, cyclic, and tunable release of various agents.
  • The field has evolved from basic materials to sophisticated, rationally designed polymers for specific biological functions.
  • Chemical engineering innovations have significantly driven progress in polymer-based drug delivery.

Purpose of the Study:

  • To review fundamental polymer-based drug delivery systems and their mathematical underpinnings.
  • To discuss physiological barriers impacting drug delivery efficacy.
  • To highlight advancements in stimuli-responsive polymers, polymer therapeutics, and intelligent polymer systems.

Main Methods:

  • Review of fundamental drug delivery principles and mathematical models.
  • Analysis of physiological barriers in drug transport.
  • Survey of stimuli-responsive polymers, polymer-drug conjugates, and polymer-protein conjugates.
  • Exploration of polymers with molecular recognition and intracellular delivery capabilities.

Main Results:

  • Polymers provide versatile platforms for controlled and targeted drug release.
  • Stimuli-responsive polymers and polymer conjugates offer enhanced therapeutic efficacy.
  • Advanced polymers are being developed for molecular recognition and directed intracellular delivery.
  • Rational polymer design is key to overcoming drug delivery challenges.

Conclusions:

  • Polymer science is central to the future of advanced drug delivery systems.
  • Tailored polymer design and engineering are critical for overcoming physiological barriers and achieving targeted delivery.
  • Emerging polymer technologies promise to revolutionize therapeutic applications through enhanced drug targeting and release mechanisms.