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A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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Novel pH-sensitive microgels prepared using salt bridge.

Xia Yang1, Jin-Chul Kim

  • 1School of Biotechnology & Bioengineering and Institute of Bioscience and Biotechnology, Kangwon National University, 192-1 Hyoja 2 dong, Chunchon, Kangwon-do 200-701, Republic of Korea.

International Journal of Pharmaceutics
|December 29, 2009
PubMed
Summary
This summary is machine-generated.

New pH-sensitive microgels made from carboxymethylcellulose and polymeric beta-cyclodextrin show rapid release at low pH and minimal release at high pH. These advanced materials offer tunable drug delivery capabilities based on environmental acidity.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • pH-sensitive hydrogels are crucial for targeted drug delivery.
  • Carboxymethylcellulose (CMC) and polymeric beta-cyclodextrin (PbetaCD) offer unique properties for microgel formulation.
  • Developing stimuli-responsive materials requires precise control over crosslinking and composition.

Purpose of the Study:

  • To synthesize and characterize novel pH-sensitive microgels.
  • To investigate the release kinetics of encapsulated substances at varying pH levels.
  • To understand the mechanism of pH-induced microgel disintegration and swelling.

Main Methods:

  • Microgels synthesized via crosslinking CMC and PbetaCD using (2-hydroxyethyl)trimethylammonium chloride benzoate (TMACB).
  • PbetaCD prepared through reaction of epichlorohydrin and beta-CD.
  • Calcein release studies conducted across a pH range (3.0, 8.0, 11.0).

Main Results:

  • Microgel size ranged from tens of nanometers to several micrometers.
  • Calcein release was 23% at pH 8.0, nearly 100% at pH 3.0, and 47% at pH 11.0.
  • Acidic conditions (pH 3.0) caused microgel disintegration due to loss of carboxyl group charge, while alkaline conditions (pH 11.0) induced swelling.

Conclusions:

  • The developed CMC/PbetaCD microgels exhibit significant pH-dependent release behavior.
  • The microgels demonstrate potential for controlled release applications, particularly in acidic environments.
  • Understanding the interplay between pH, charge, and microgel structure is key to optimizing their performance.