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Modified-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...
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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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Programmable microcapsules from self-immolative polymers.

Aaron P Esser-Kahn1, Nancy R Sottos, Scott R White

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|July 29, 2010
PubMed
Summary
This summary is machine-generated.

Programmable microcapsules are developed using self-immolative polymers. These smart capsules release contents only when specific chemical triggers remove end groups, enabling controlled material repair.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Autonomous repair of damaged materials requires advanced delivery systems.
  • Current microcapsules often rely on mechanical rupture for content release.
  • A need exists for microcapsules with programmable, stimuli-responsive release mechanisms.

Purpose of the Study:

  • To develop a general method for creating programmable microcapsules.
  • To engineer microcapsules that release contents in response to specific chemical triggers, not just mechanical force.
  • To demonstrate the controlled release capabilities of these novel microcapsules.

Main Methods:

  • Synthesis of core-shell microcapsules with self-immolative polymer networks.
  • Incorporation of specific triggering end groups (Boc and Fmoc) into the polymer shell.
  • Testing microcapsule stability and triggered release under various chemical conditions.

Main Results:

  • Successfully fabricated programmable microcapsules with self-immolative polymer shells.
  • Demonstrated that microcapsules release contents exclusively upon removal of specific triggering end groups (Boc/Fmoc).
  • Observed physical cracking of shell walls upon exposure to triggering conditions, supporting the depolymerization mechanism.

Conclusions:

  • A versatile route to programmable microcapsules based on self-immolative polymers has been established.
  • These microcapsules offer controlled content release triggered by specific chemical stimuli.
  • The developed technology holds promise for applications in autonomous material repair and advanced drug delivery.