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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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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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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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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: Mar 15, 2026

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Quaternized Chitosan Crosslinked Networks for pH-Responsive Macromolecule Delivery: A Review.

Tongtong Wang1,2, Hui Sun1,2

  • 1School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China.

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|March 14, 2026
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Summary

Quaternized chitosan (QCS) materials with dynamic covalent networks offer pH-responsive properties for intelligent packaging and targeted therapy. Green crosslinkers enhance QCS properties, addressing limitations for broader applications.

Keywords:
antibacterial-anticancer synergistic therapycontrolled-release deliverycrosslinked networksgreen crosslinking agentspH-responsive smart packagingquaternary ammonium salt chitosan

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery

Background:

  • Chitosan is a biocompatible polysaccharide with antibacterial properties but limited solubility and mechanical strength.
  • Existing chitosan applications are restricted by poor solubility in neutral pH and suboptimal mechanical characteristics.

Purpose of the Study:

  • To review the molecular design, crosslinking strategies, and applications of quaternized chitosan (QCS) materials.
  • To explore the potential of QCS in intelligent packaging and targeted therapy by overcoming inherent chitosan limitations.

Main Methods:

  • Construction of dynamic covalent networks using QCS and green crosslinkers (genipin, dialdehyde cellulose).
  • Investigation of synergistic Schiff-base/hydrogen-bonding mechanisms for dual responsive release.
  • Analysis of the relationship between quaternization degree and cytotoxicity.

Main Results:

  • QCS materials exhibit excellent pH-responsive intelligence through dynamic covalent networks.
  • Synergistic Schiff-base/hydrogen-bonding enables dual pH/enzyme responsive release.
  • Green crosslinkers effectively tailor network properties and improve material characteristics.

Conclusions:

  • QCS integrated with green crosslinkers shows significant potential for intelligent packaging and antibacterial-anticancer synergistic therapy.
  • Addressing the quaternization degree-cytotoxicity relationship is crucial for clinical translation.
  • The 'perception-response' design principle of QCS offers advanced functionalities for biomedical applications.