Related Experiment Video
Updated: May 23, 2026
14:37
High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
Published on: July 6, 2012
Modified polysaccharides as versatile materials in controlled delivery of antidegenerative agents
Anna Karewicz1, Dorota Bielska, Maria Nowakowska
1Nanotechnology of Polymers and Biomaterials Group, Faculty of Chemistry, Jagiellonian University, Krakow, Poland. karewicz@chemia.uj.edu.pl
Current Pharmaceutical Design
|April 20, 2012
Summary
Natural polysaccharides are modified to create advanced drug delivery systems for degenerative diseases. These tailored carriers improve drug targeting and release, offering novel therapeutic solutions.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Drug Delivery
Background:
- Degenerative diseases necessitate innovative therapeutic strategies.
- Natural polysaccharides offer versatile platforms for drug delivery system development.
- Tailoring polysaccharide properties is key to enhancing therapeutic efficacy.
Purpose of the Study:
- To review modifications of natural polysaccharides for improved anti-degenerative agent delivery.
- To discuss how derivatization impacts carrier properties and therapeutic outcomes.
- To highlight applications of polysaccharide derivatives in targeted drug delivery.
Main Methods:
- Chemical derivatization of natural polysaccharides (e.g., introducing ionic/hydrophobic groups, degradable bonds, targeting moieties).
- Characterization of modified polysaccharides and their drug delivery systems (e.g., size, charge, encapsulation efficiency, release profiles, in vivo stability).
- Evaluation of enhanced mucoadhesion and active targeting capabilities.
Main Results:
- Polysaccharide modifications effectively tune carrier properties like polarity, amphiphilicity, and stability.
- Derivatized polysaccharides demonstrate improved drug encapsulation and controlled release profiles.
- Applications show enhanced mucoadhesion and active targeting for various nano/microparticulate systems, liposomes, and conjugates.
Conclusions:
- Modified natural polysaccharides represent a promising strategy for advanced anti-degenerative drug delivery.
- Tailored polysaccharide derivatives enhance therapeutic agent performance and targeting.
- These materials offer versatile solutions for complex degenerative disease treatments.
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...
01:23Modified-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...
01:22Modified-Release Drug Delivery Systems: Rate-Programmed I
Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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.
01:30Modified-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...
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...