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Modified-Release Drug Delivery Systems: Stimuli-Activated

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: 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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Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

Published on: February 13, 2016

Drug release from electric-field-responsive nanoparticles.

Jun Ge¹, Evgenios Neofytou, Thomas J Cahill

¹Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

|November 25, 2011

Summary

Researchers developed a novel dual-stimulus responsive nanoparticle system for precise drug delivery. Applying an electric field controls pharmaceutical release from polypyrrole nanoparticles, offering tailored therapeutic profiles.

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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

Area of Science:

Biomaterials Science
Nanotechnology
Drug Delivery Systems

Background:

Developing advanced drug delivery systems is crucial for improving therapeutic efficacy and patient outcomes.
Stimuli-responsive materials offer potential for controlled and targeted drug release.
Conducting polymers present unique properties for biomedical applications.

Purpose of the Study:

To introduce a novel dual-stimulus (temperature and electric field) responsive nanoparticle system for programmed drug delivery.
To investigate the controlled release of pharmaceuticals from polypyrrole nanoparticles using an external electric field.
To demonstrate the potential for precise spatial, temporal, and dosage control in drug delivery.

Main Methods:

Synthesized polypyrrole nanoparticles loaded with therapeutic pharmaceuticals.
Utilized a temperature-sensitive hydrogel (PLGA-PEG-PLGA) for subcutaneous localization of nanoparticles in vivo.
Applied a weak, external direct current (DC) electric field to control drug release from the nanoparticles.

Main Results:

Demonstrated successful in vivo localization of drug-loaded nanoparticles using a temperature-sensitive hydrogel.
Showcased that drug release from polypyrrole nanoparticles can be effectively controlled by an external DC electric field.
Achieved externally tailored release profiles with excellent spatial, temporal, and dosage control.

Conclusions:

The developed dual-stimulus responsive nanoparticle system offers a novel approach for programmed drug delivery.
External electric field application provides precise control over drug release kinetics.
This interactive drug delivery system holds significant promise for advanced therapeutic applications.