Related Experiment Video
Updated: Jun 13, 2026
08:44
Assembly and Characterization of Polyelectrolyte Complex Micelles
Published on: March 2, 2020
Chitosan based polyelectrolyte complexes as potential carrier materials in drug delivery systems
1Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa. hammanjh@tut.ac.za
Marine Drugs
|May 19, 2010
Summary
Chitosan
Area of Science:
- Materials Science
- Polymer Chemistry
- Pharmaceutical Sciences
Background:
- Chitosan is a promising biocompatible, biodegradable, and low-toxicity polymer for drug delivery.
- Its rapid dissolution in the stomach limits its use in modified-release oral dosage forms.
- Chitosan's positive charge at low pH enables complexation with polyanions.
Purpose of the Study:
- To review the complexation of chitosan with natural and synthetic polyanions.
- To identify factors influencing polyelectrolyte complex formation and stability.
- To highlight recent applications of these complexes in drug delivery systems.
Main Methods:
- Complexation of chitosan with various polyanions.
- Characterization of polyelectrolyte complex properties.
- Review of drug delivery systems utilizing chitosan-based complexes.
Main Results:
- Chitosan-polyanion complexes exhibit favorable physicochemical properties while retaining chitosan's biocompatibility.
- Factors influencing complex formation and stability were identified.
- These complexes are effective excipients in various drug delivery systems.
Conclusions:
- Chitosan-polyanion complexes offer a viable solution to overcome chitosan's fast dissolution rate.
- These complexes are versatile excipients for designing advanced drug delivery systems.
- Further research into these complexes can optimize drug delivery strategies.
Related Concept Videos
01:24Site-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...
01:05Bioavailability Enhancement: Drug Stability Enhancement and GI Retention
Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
01:24Modified-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.
01:19Modified-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...
01:27Bioavailability Enhancement: Drug Permeability Enhancement
After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...
01:23Modified-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...