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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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Characterizing Drug Release from Nonfouling Polyampholyte Hydrogels.

Marcos N Barcellona¹, Nicholas Johnson¹, Matthew T Bernards¹

¹Department of Bioengineering and ‡Department of Chemical Engineering, University of Missouri , Columbia, Missouri 65211, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 26, 2015

Summary

This study shows that a nonfouling hydrogel platform can control the release of bioactive molecules for tissue regeneration. The release rate depends on molecule charge, pH, and ionic strength, demonstrating its potential for drug delivery.

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Area of Science:

Biomaterials Science
Tissue Engineering
Drug Delivery Systems

Background:

Controlled release of bioactive molecules is crucial for advanced tissue regeneration scaffolds.
Nonfouling platforms are needed to prevent interference from the foreign body response.
Polyampholyte hydrogels offer potential for controlled bioactive molecule delivery.

Purpose of the Study:

To characterize the release profiles of pseudodrug molecules from a nonfouling polyampholyte hydrogel.
To assess the hydrogel's potential as a tissue regeneration scaffold.
To understand how hydrogel properties influence molecule release.

Main Methods:

Synthesized hydrogels from [2-(acryloyloxy)ethyl] trimethylammonium chloride (TMA) and 2-carboxyethyl acrylate (CAA) monomers.
Incorporated caffeine, methylene blue, and metanil yellow as pseudodrugs.
Analyzed release kinetics based on cross-linker density, pH, and ionic strength.
Confirmed nonfouling properties using enzyme-linked immunosorbent assay.

Main Results:

Neutral caffeine release followed diffusion kinetics.
Charged molecule release was influenced by interactions with hydrogel monomers (TMA/CAA).
Release rates of metanil yellow and methylene blue varied significantly with pH and ionic strength.
Hydrogels maintained nonfouling characteristics post-release.

Conclusions:

The TMA:CAA hydrogel system effectively controls bioactive molecule release.
Release mechanisms differ for neutral versus charged molecules.
The platform shows promise for both short-term and long-term bioactive molecule delivery in tissue regeneration.
This multifunctional hydrogel platform is suitable for advanced therapeutic applications.