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Light-mediated Formation and Patterning of Hydrogels for Cell Culture Applications

Light-mediated Formation and Patterning of Hydrogels for Cell Culture Applications

Published on: September 29, 2016

Azobenzene-based light-responsive hydrogel system.

Yan-Li Zhao¹, J Fraser Stoddart

¹Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 6, 2010

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This study details a light-responsive hydrogel formed by a beta-cyclodextrin derivative and an azobenzene copolymer. UV light triggers a reversible gel-to-sol transition by altering azobenzene configurations, enabling controlled phase changes.

Area of Science:

Supramolecular Chemistry
Polymer Science
Materials Science

Background:

Development of responsive hydrogels is crucial for advanced materials.
Photoisomerization of azobenzene units offers a pathway for external control.
Supramolecular inclusion complexes provide a platform for novel material design.

Purpose of the Study:

To synthesize and characterize a light-responsive hydrogel.
To investigate the association and dissociation of a beta-cyclodextrin derivative with an azobenzene-branched poly(acrylic acid) copolymer.
To explore the photoinduced gel-to-sol and sol-to-gel phase transitions.

Main Methods:

Synthesis of a deoxycholic acid-modified beta-cyclodextrin derivative and an azobenzene-branched poly(acrylic acid) copolymer.

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Characterization using UV/vis spectroscopy, induced circular dichroism, and 1H NMR spectroscopy.

Investigation of hydrogel phase transitions upon photoirradiation with UV (355 nm) and visible (450 nm) light.

Main Results:

A supramolecular inclusion complex formed a hydrogel.
Trans-azobenzene units strongly bound within beta-cyclodextrin cavities; cis-azobenzene units did not bind.
UV light induced efficient gel-to-sol transition via trans-cis isomerization and dissociation; visible light recovered the gel phase.
The hydrogel exhibited a swelling ratio of 8.7 ± 0.7 and underwent multiple reversible phase transitions.

Conclusions:

The synthesized hydrogel demonstrates effective light-responsive behavior.
Photoisomerization of azobenzene units is a viable mechanism for controlling hydrogel phase transitions.
This system holds potential for applications requiring tunable hydrogel properties.