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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

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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...
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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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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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Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
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Published on: September 20, 2011

Timed-release polymer nanoparticles.

Nguyen T D Tran1, Nghia P Truong, Wenyi Gu

  • 1Australian Institute for Bioengineering and Nanotechnology and Institute for Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia.

Biomacromolecules
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed polymer nanoparticles that release DNA without external triggers. These self-assembling nanoparticles disassemble over time, enabling controlled drug delivery for personalized medicine.

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Area of Science:

  • Polymer Chemistry
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Controlled drug delivery systems are crucial for effective therapeutics.
  • Existing nanoparticle systems often require external triggers for drug release.
  • Developing self-regulating release mechanisms is a key challenge in nanomedicine.

Purpose of the Study:

  • To demonstrate triggered-release of encapsulated therapeutics from nanoparticles without external stimuli.
  • To develop polymer nanoparticles capable of controlled disassembly and drug release.
  • To explore the potential of these nanoparticles in personalized point-of-care treatment.

Main Methods:

  • Synthesis of diblock copolymers with hydrophilic and thermoresponsive blocks.
  • Self-assembly of copolymers into nanoparticles (approx. 25 nm diameter) above the lower critical solution temperature (LCST).
  • In situ manipulation of nanoparticle disassembly via self-catalyzed degradation of cationic units to anionic groups, altering the LCST.

Main Results:

  • Demonstrated triggered release of oligo DNA from polymer nanoparticles.
  • Achieved controlled nanoparticle disassembly over a tunable range of 10 to 70 hours.
  • Verified nanoparticle self-assembly below 37 °C and disassembly when the LCST increased above 37 °C.

Conclusions:

  • Developed a novel nanoparticle system for intrinsic, time-controlled drug release.
  • The system allows for precise, predetermined release of encapsulated agents.
  • These nanoparticles show significant potential for advancing combined therapies and personalized medicine.