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Novel injectable pH and temperature sensitive block copolymer hydrogel.

Woo Sun Shim1, Jae Sun Yoo, You Han Bae

  • 1Department of Polymer Science & Engineering, Sungkyunkwan University, Suwon, Gyunggi 440-746, Korea.

Biomacromolecules
|November 15, 2005
PubMed
Summary

A novel block copolymer exhibits reversible sol-gel transitions responsive to pH and temperature changes. This injectable material is ideal for drug and protein delivery systems, preventing premature gelation.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Drug Delivery Systems

Background:

  • Developing smart materials for targeted drug delivery is crucial.
  • Block copolymers offer tunable properties for various applications.
  • Sol-gel transitions are desirable for injectable formulations.

Purpose of the Study:

  • To synthesize and characterize a novel pH and temperature-sensitive block copolymer.
  • To investigate its reversible sol-gel transition properties.
  • To evaluate its potential as an injectable carrier system.

Main Methods:

  • Preparation of a pH-sensitive moiety-modified temperature-sensitive block copolymer.
  • Analysis of sol-gel transition behavior in response to pH (7.4-8.0) and temperature (body temperature).

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  • Precise molecular weight control and hydrophilic-hydrophobic balance tuning.

    • Main Results:

    • The block copolymer solution demonstrated reversible sol-gel transitions within physiological pH and temperature ranges.
    • Gelation occurred at 37°C and pH 7.4, while remaining in a sol state at room temperature and pH 8.0.
    • The material prevented in-needle gelation and showed potential for long guide catheters.

    Conclusions:

    • This novel block copolymer hydrogel is suitable for injectable drug and protein delivery.
    • Its tunable sol-gel transition properties offer advantages for sensitive biomolecules.
    • The system serves as a template for advanced injectable delivery technologies.