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Related Concept Videos

Modified-Release Drug Delivery Systems: Classification01:23

Modified-Release Drug Delivery Systems: Classification

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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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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

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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: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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...
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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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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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Transdermal Drug Delivery Systems01:18

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Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
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Highly Efficient Thermoresponsive Nanocomposite for Controlled Release Applications.

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Researchers developed novel magnetic microparticles for efficient drug delivery. These iron nanowire-embedded hydrogel particles release Rhodamine B with significantly lower magnetic field power than traditional superparamagnetic beads.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Developing efficient drug delivery systems is crucial for targeted therapies.
  • Magnetic actuation offers remote control for drug release mechanisms.
  • Current methods often require high magnetic field strengths, limiting applications.

Purpose of the Study:

  • To create highly efficient magnetic-responsive nanocomposite microparticles for drug delivery.
  • To investigate the triggered release of Rhodamine B using embedded iron nanowires.
  • To compare the performance of these microparticles with those containing superparamagnetic beads.

Main Methods:

  • Fabrication of Poly(N-isopropylacrylamide) hydrogel microparticles with embedded iron nanowires using microfluidics.
  • Incorporation of Rhodamine B as a model drug for release studies.
  • Application of low-power magnetic fields (1 mT, 20 kHz) for continuous and pulsatile drug release.
  • Comparative testing with microparticles containing superparamagnetic beads.
  • Cytotoxicity assays to evaluate biocompatibility.

Main Results:

  • Achieved 6.5% release in continuous mode and 70% in pulsatile mode using only 1 mT and 20 kHz magnetic fields.
  • Demonstrated significantly higher efficiency at much lower magnetic field power compared to superparamagnetic beads (which required 73 mT and 600 kHz).
  • Iron nanowires' high remanent magnetization induced vibrations, friction, and heating for efficient release.
  • Cytotoxicity assays confirmed high cell viability for both nanowire and bead-based microparticles.

Conclusions:

  • Iron nanowire-embedded hydrogel microparticles offer a highly efficient and low-power magnetic drug release system.
  • Microfluidic fabrication allows precise control over particle composition and rapid production.
  • This technology presents a promising alternative to existing magnetic drug delivery systems, enhancing safety and applicability.