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Related Concept Videos

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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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: 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 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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Modified-Release Drug Delivery Systems: Drug Release Characteristics01:22

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Drug release from modified-release dosage forms is designed to achieve specific therapeutic effects by controlling the rate and extent of drug release. The classification of these drug release systems is based on key pharmacokinetic assumptions: drug disposition follows first-order kinetics, drug release is the rate-limiting step in absorption, and the released drug is rapidly and completely absorbed.There are four major models of drug release patterns. The first model is the slow zero-order...
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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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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.
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An enzyme-responsive controlled release system based on a dual-functional peptide.

X Li1, S Burger, A J O'Connor

  • 1Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC 3010, Australia. s.gras@unimelb.edu.au.

Chemical Communications (Cambridge, England)
|March 22, 2016
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Researchers developed a novel controlled release system using a dual-functional peptide (DFP) on mesoporous silica. This stimuli-responsive material releases therapeutic peptides via protease cleavage, advancing smart biomaterial design.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Nanotechnology

Background:

  • Controlled release systems are crucial for targeted therapeutic delivery.
  • Stimuli-responsive materials offer advanced control over drug release kinetics.
  • Mesoporous silica provides a versatile platform for biomaterial development.

Purpose of the Study:

  • To develop a novel stimuli-responsive controlled release system.
  • To incorporate a dual-functional peptide (DFP) into a mesoporous silica matrix.
  • To demonstrate protease-cleavable peptide release for therapeutic applications.

Main Methods:

  • One-pot synthesis of a dual-functional peptide (DFP).
  • Loading of DFP onto a mesoporous silica material.
  • Characterization of the stimuli-responsive release mechanism via protease cleavage.

Main Results:

  • Successful development of a DFP-loaded mesoporous silica system.
  • Demonstration of stimuli-responsive peptide release triggered by protease activity.
  • Confirmation of the system's potential for controlled therapeutic peptide delivery.

Conclusions:

  • The developed system represents a significant advancement in smart biomaterials.
  • Protease-cleavable DFP release offers precise control over therapeutic peptide delivery.
  • This approach paves the way for next-generation stimuli-responsive drug delivery platforms.