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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

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...
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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

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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,...
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Modified-Release Drug Delivery Systems: Site-Targeted01:24

Modified-Release Drug Delivery Systems: Site-Targeted

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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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Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

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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: Apr 20, 2026

Preparation and Characterization of Lipophilic Doxorubicin Pro-drug Micelles
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pH-sensitive controlled release of doxorubicin from polyelectrolyte multilayers.

Lin Wang1, Ke-feng Ren1, Hai-bo Wang1

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Colloids and Surfaces. B, Biointerfaces
|December 3, 2014
PubMed
Summary

Researchers developed pH-sensitive polyelectrolyte multilayers for controlled doxorubicin release. This method shows potential for targeted tumor treatment by releasing drugs effectively at lower pH levels found in tumors.

Keywords:
Controlled drug releaseDoxorubicinHydrazone bondLayer-by-layer assemblypH-sensitive

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Nanotechnology

Background:

  • Controlled drug release from polyelectrolyte multilayers remains a challenge.
  • Incorporating and controlling drug interactions within multilayers is difficult.
  • Developing stimuli-responsive systems for targeted delivery is crucial.

Purpose of the Study:

  • To develop a facile method for fabricating pH-sensitive polyelectrolyte multilayers.
  • To achieve controlled release of doxorubicin (DOX) from these multilayers.
  • To evaluate the potential of these systems for biomedical applications in tumor treatment.

Main Methods:

  • Conjugating DOX to hyaluronan (HA) via a pH-responsive hydrazone bond.
  • Assembling HA-DOX and poly-L-lysine (PLL) into multilayers using layer-by-layer assembly.
  • Characterizing multilayer growth, morphology, and structure using spectroscopic ellipsometry, SEM, and UV-Vis spectroscopy.

Main Results:

  • Successfully fabricated HA-DOX/PLL polyelectrolyte multilayers.
  • Demonstrated pH-dependent DOX release, with significantly higher release at pH 6.0 and 5.0 compared to pH 7.4.
  • Showed remarkable inhibition of human hepatoma (HepG2) cells at pH 5.0 when treated with the multilayers.

Conclusions:

  • The developed polyelectrolyte multilayers exhibit pH-sensitive doxorubicin release.
  • This system shows promise for targeted drug delivery in tumor treatment.
  • Potential applications in biomedical devices for oncology are indicated.