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A Polyanionic Tartrate-containing Temperature-responsive Hydrogel.

Wei Wei Loh1, Miao Huang1,2, Leonard Goh1

  • 1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, 138634, Singapore.

Chemistry, an Asian Journal
|August 9, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new charged polymer that forms thermogels at body temperature. These polyanionic thermogels offer tunable properties and controlled drug release for biomedical applications.

Keywords:
BiomedicalCationSupramolecularSustained drug releaseThermogel

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials Engineering

Background:

  • Thermogels are soft biomaterials that undergo sol-gel transitions upon warming.
  • Most existing thermogelling polymers are uncharged, limiting understanding of charge effects on thermogelation.
  • The influence of ionizable groups on thermogel properties remains largely unexplored.

Purpose of the Study:

  • To report the first polyanionic amphiphilic multi-block copolymer capable of forming thermogels.
  • To investigate the impact of negative charges on micelle and thermogel properties.
  • To explore the modulation of thermogel rheology and drug release using polyanionic character.

Main Methods:

  • Synthesis of a polyanionic amphiphilic multi-block copolymer with pendant carboxylate groups.
  • Characterization of thermogel formation and properties upon warming to physiological temperatures.
  • Evaluation of rheological properties (stiffness, gelation temperature) via electrostatic interactions with cations.
  • Assessment of drug release profiles for cationic and anionic model compounds.

Main Results:

  • Successful formation of transparent thermogels from the polyanionic copolymer at physiological temperatures.
  • Demonstration that negative charges significantly alter micelle and thermogel characteristics.
  • Tunable rheological properties (stiffness, gelation temperature) achieved through cation interactions.
  • Slower sustained release of a cationic drug observed compared to an anionic drug over two weeks.

Conclusions:

  • Introduced a novel polyanionic thermogelling polymer with tunable properties.
  • Highlighted the significant impact of polymer charge on thermogel behavior and drug delivery.
  • Showcased potential for advanced biomedical applications of charged polyelectrolyte thermogels.