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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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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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...
Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

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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...
Oral Drug Delivery Systems: Delayed-Release Systems01:11

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...
Modified-Release Drug Delivery Systems: Rate-Programmed I01:22

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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,...
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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...

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Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
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Biodegradable click capsules with engineered drug-loaded multilayers.

Christopher J Ochs1, Georgina K Such, Yan Yan

  • 1Centre for Nanoscience and Nanotechnology, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia.

ACS Nano
|March 6, 2010
PubMed
Summary
This summary is machine-generated.

Researchers created drug-loaded polymer capsules using a modular approach. These biodegradable capsules offer controlled drug release and show potential for cancer therapy delivery systems.

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Area of Science:

  • Polymer chemistry and materials science
  • Biomedical engineering
  • Drug delivery systems

Background:

  • Development of advanced drug delivery systems is crucial for effective cancer therapy.
  • Polymer-drug conjugates offer potential for targeted and controlled therapeutic agent delivery.
  • Existing methods often lack precise control over drug loading, positioning, and release kinetics.

Purpose of the Study:

  • To report the modular assembly of polymer-drug conjugates into stable, responsive, and biodegradable capsules.
  • To demonstrate control over drug dose and spatial positioning within multilayered capsule films.
  • To evaluate the potential of these capsules as drug carrier systems for biomedical applications.

Main Methods:

  • Conjugation of doxorubicin hydrochloride (DOX) to alkyne-functionalized poly(l-glutamic acid) (PGA(Alk)).
  • Assembly of polymer layers via hydrogen bonding with poly(N-vinyl pyrrolidone) (PVPON) on silica templates.
  • Covalent stabilization using diazide cross-linkers, followed by PVPON removal and template dissolution.

Main Results:

  • Successfully fabricated covalently stabilized, responsive, and biodegradable polymer capsules.
  • Achieved precise control over drug (DOX) loading and its position within the multilayered structure.
  • Demonstrated sustained drug release over 2 hours and significant reduction in cancer cell viability.

Conclusions:

  • The modular approach enables the creation of versatile, drug-loaded polymer capsules.
  • These biodegradable capsules are stable across a wide pH range and exhibit tunable drug release.
  • The developed system shows significant promise as a carrier for biomedical and cancer therapeutic applications.