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Related Concept Videos

Drug Delivery: Overview01:16

Drug Delivery: Overview

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The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
Enteral delivery involves administering drugs directly through swallowing, sublingual placement, or buccal application. Orally administered drugs predominantly navigate the...
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Hyaluronic Acid Microgels as Sequential Drug Delivery Systems.

Michael Alexander Maier1,2, Maria Isabell Pieper1,2, Andrij Pich1,2,3

  • 1DWI - Leibniz Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstraße 50, Aachen 52074, Germany.

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Summary
This summary is machine-generated.

Researchers developed sequential drug delivery systems using hyaluronic acid microgels. These advanced carriers can release multiple substances, like drugs and biomolecules, in a controlled order for improved therapeutic effects.

Keywords:
hyaluronic acidmicrofluidicsmicrogelssequential drug releasesmart drug delivery systems

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Polymer Chemistry

Background:

  • Precise drug delivery is crucial for effective treatments and reduced side effects.
  • Existing systems struggle with sequential release of multiple compounds.
  • Sequential release can enhance synergistic effects and decrease dosing frequency.

Purpose of the Study:

  • To synthesize and characterize hyaluronic acid microgels for sequential drug and biomolecule delivery.
  • To investigate the loading capacity and release kinetics of these microgels.
  • To demonstrate controlled sequential release by modulating microgel properties and degradation.

Main Methods:

  • Hyaluronic acid was modified with methacrylate groups and cross-linked to form microgels via microfluidics.
  • Microgels were characterized for size and polyanionic nature.
  • Loading and release of cationic drugs (doxorubicin, methylene blue, besifloxacin) and biomolecules were studied under varying pH and ionic strength.
  • Enzymatic degradation using hyaluronidase was employed for sustained release and sequential delivery.

Main Results:

  • Hyaluronic acid microgels (114-250 μm) were successfully synthesized.
  • Cationic drugs showed rapid release, while biomolecules were retained.
  • Sustained release over days was achieved via enzymatic degradation.
  • Sequential release of drugs and biomolecules was demonstrated and controlled by enzyme concentration and cross-linking density.

Conclusions:

  • Hyaluronic acid microgels are suitable for sequential delivery of different payloads.
  • Release profiles can be tuned by adjusting microgel cross-linking and degradation rates.
  • This technology offers a promising platform for advanced multi-substance therapeutic strategies.