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Modified-Release Drug Delivery Systems: Classification

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: Site-Targeted

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.

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...

Modified-Release Drug Delivery Systems: Rate-Programmed II

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...

Modified-Release Drug Delivery Systems: Drug Release Characteristics

Modified-Release Drug Delivery Systems: Drug Release Characteristics

Drug release from modified-release dosage forms is designed to achieve specific therapeutic effects by controlling the rate and extent of drug release. The classification of these drug release systems is based on key pharmacokinetic assumptions: drug disposition follows first-order kinetics, drug release is the rate-limiting step in absorption, and the released drug is rapidly and completely absorbed.There are four major models of drug release patterns. The first model is the slow zero-order...

Oral Drug Delivery Systems: Delayed-Release Systems

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...

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Related Experiment Video

Updated: May 3, 2026

Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization

Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization

Published on: January 24, 2025

pH-responsive nanoemulsions for controlled drug release.

Feng Liu¹, Shudong Lin, Zuoquan Zhang

¹Guangzhou Institute of Chemistry, Chinese Academy of Sciences , Guangzhou 510650, P. R .China.

Biomacromolecules

|February 18, 2014

Summary

Novel graft copolymers controllably release doxorubicin (DOX) from nanoemulsions by pH changes. This smart drug delivery system shows potential for cancer therapy due to its non-toxicity and cellular uptake.

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Area of Science:

Polymer Chemistry
Materials Science
Nanotechnology

Background:

Developing stimuli-responsive drug delivery systems is crucial for targeted cancer therapy.
Nanoemulsions offer advantages in drug solubility and bioavailability.
Controlling drug release kinetics is key to maximizing therapeutic efficacy and minimizing side effects.

Purpose of the Study:

To synthesize and characterize ternary graft copolymers for pH-responsive nanoemulsion stabilization.
To investigate the mechanism of doxorubicin (DOX) release from benzyl benzoate (BBZ) nanoemulsions stabilized by these copolymers.
To evaluate the potential of these nanoemulsions as non-toxic drug delivery vehicles for cancer treatment.

Main Methods:

Synthesis of ternary graft copolymers with polystyrene (PS), poly(ethylene glycol) methyl ether (MPEG), and poly(acrylic acid) (PAA) side chains.
Characterization of copolymer properties and nanoemulsion formation at different pH values (7.4 and 5.0).
Monitoring doxorubicin release kinetics and assessing nanoemulsion cytotoxicity and cellular uptake in human carcinoma cells.

Main Results:

Copolymers effectively stabilized doxorubicin-loaded benzyl benzoate nanoemulsions at pH 7.4, inhibiting drug release.
A decrease in pH to 5.0 triggered copolymer conformational changes, leading to nanoemulsion aggregation and significant doxorubicin release.
The rate and extent of drug release were tunable by adjusting the ratio of PAA and MPEG chains.
The nanoemulsions demonstrated negligible toxicity and were internalized by human carcinoma cells, releasing their payload intracellularly.

Conclusions:

The synthesized ternary graft copolymers enable pH-triggered doxorubicin release from nanoemulsions.
These responsive nanoemulsions show promise as effective and safe drug delivery vehicles for cancer therapy.
The ability to control drug release by external stimuli offers a significant advantage in therapeutic applications.