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Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...

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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: 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.

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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Updated: Jun 29, 2026

Manufacture and Drug Delivery Applications of Silk Nanoparticles

Manufacture and Drug Delivery Applications of Silk Nanoparticles

Published on: October 8, 2016

Polysaccharides-based nanoparticles as drug delivery systems.

Zonghua Liu¹, Yanpeng Jiao, Yifei Wang

¹Department of Materials Science and Engineering, Jinan University, Guangzhou 510632, China.

Advanced Drug Delivery Reviews

|October 14, 2008

Summary

Natural polysaccharides are promising for drug delivery systems, especially for creating nanocarriers. This review details four key methods for preparing these advanced polysaccharide-based nanoparticles.

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Area of Science:

Biomaterials Science
Nanotechnology
Pharmaceutical Sciences

Background:

Natural polysaccharides offer unique advantages for advanced applications.
Their potential in drug delivery systems, particularly as nanocarriers, is increasingly recognized.
Polysaccharides are versatile biopolymers for developing novel drug delivery platforms.

Purpose of the Study:

To review recent advancements in the preparation of polysaccharide-based nanoparticles.
To introduce key mechanisms utilized in creating these nanocarriers.
To highlight the significance of polysaccharides in modern drug delivery.

Main Methods:

Covalent crosslinking of polysaccharides.
Ionic crosslinking strategies for nanoparticle formation.
Formation of polyelectrolyte complexes.
Self-assembly of hydrophobically modified polysaccharides.

Main Results:

Four distinct mechanisms for polysaccharide-based nanoparticle preparation are detailed.
These methods enable the creation of nanometeric carriers with tailored properties.
The review synthesizes current developments in polysaccharide nanoparticle fabrication.

Conclusions:

Polysaccharide-based nanoparticles represent a significant advancement in drug delivery technology.
The discussed preparation methods offer diverse routes to engineer effective nanocarriers.
Natural polysaccharides are pivotal materials for the future of targeted and efficient drug delivery systems.