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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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Individually addressable patterned multilayer microchambers for site-specific release-on-demand.

Maxim V Kiryukhin1, Sergey R Gorelik, Shu Mei Man

  • 1Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore. kiryukhin-m@imre.a-star.edu.sg

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Summary
This summary is machine-generated.

Light-responsive microchambers enable precise, on-demand chemical release. This technology uses patterned composite films with gold nanoparticles, triggered by lasers for targeted delivery.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Site-specific chemical delivery requires precise control over release.
  • Existing methods often lack the necessary spatial resolution or on-demand capability.
  • Microscale devices offer potential for localized chemical handling.

Purpose of the Study:

  • To develop light-responsive microchambers for controlled chemical release.
  • To investigate the use of composite films with gold nanoparticles for this application.
  • To demonstrate remote, site-specific cargo release using a laser.

Main Methods:

  • Fabrication of patterned microchambers using poly(allylammonium)-poly(styrene sulfonate) multilayers.
  • Incorporation of gold nanoparticles within the multilayer structure.
  • Loading microchambers with colloid particles or oil-soluble molecules.
  • Sealing microchambers onto a glass slide with an adhesive multilayer film.
  • Remote addressing and triggering of individual microchambers using a focused laser beam.

Main Results:

  • Successfully created light-responsive microchambers capable of holding cargo.
  • Demonstrated site-specific release of loaded substances upon laser irradiation.
  • Validated the concept for precise, on-demand delivery of small quantities.

Conclusions:

  • Patterned arrays of light-responsive microchambers are effective for site-specific chemical release.
  • The composite film design incorporating gold nanoparticles allows for laser-triggered cargo expulsion.
  • This technology holds promise for applications requiring precise, localized delivery of chemicals.