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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

Published on: November 11, 2022

Hydrogels cross-linked by native chemical ligation.

Bi-Huang Hu¹, Jing Su, Phillip B Messersmith

¹Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, USA.

Biomacromolecules

|July 16, 2009

Summary

Native chemical ligation (NCL) enables rapid formation of cross-linked polymer hydrogels. This method allows for biomolecule conjugation, creating functional hydrogels for potential biomedical applications.

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Cellular Encapsulation in 3D Hydrogels for Tissue Engineering

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Published on: October 26, 2009

Area of Science:

Polymer Chemistry
Biomaterials Science
Organic Chemistry

Background:

Hydrogels are versatile materials with numerous applications, particularly in biomedicine.
Developing efficient and controllable methods for hydrogel formation is crucial.
Native chemical ligation (NCL) offers a chemoselective approach for bioconjugation.

Purpose of the Study:

To develop a novel hydrogel formation strategy using native chemical ligation (NCL).
To synthesize and characterize poly(ethylene glycol) (PEG) macromonomers for NCL-based hydrogelation.
To explore the potential for biological functionalization of NCL-formed hydrogels.

Main Methods:

Synthesis of four-armed PEG macromonomers with thioester or N-terminal cysteine functionalities.
Hydrogel formation by mixing aqueous solutions of the synthesized macromonomers.
Characterization of gelation kinetics and viscoelastic properties using oscillatory rheology.
Functionalization of hydrogels via thiol regeneration and subsequent peptide conjugation.

Main Results:

Rapid formation of rigid hydrogels within minutes via NCL reaction.
Gelation time influenced by buffer, pH, polymer concentration, temperature, and macromonomer composition.
Rheological studies confirmed the formation of elastic, cross-linked hydrogels.
Successful conjugation of a peptide (GRGDSPG) to the hydrogel, enabling human mesenchymal stem cell (hMSC) attachment.

Conclusions:

NCL provides a mild, chemoselective, and efficient method for creating functional polymer hydrogels.
The ability to regenerate thiol groups allows for straightforward biomolecule immobilization.
This approach holds significant promise for developing advanced hydrogels for biomedical applications.