Electrostatic interactions regulate the release of small molecules from supramolecular hydrogels.

Area of Science:

• Biomaterials Science
• Supramolecular Chemistry
• Drug Delivery Systems

Background:

• Supramolecular hydrogels show promise for sustained therapeutic delivery.
• Peptide-based hydrogels are effective but costly.
• Low molecular weight (LMW) hydrogels present an affordable alternative.

Purpose of the Study:

• To investigate electrostatic effects on cargo release from Fmoc-Phe hydrogels.
• To establish design principles for optimizing LMW hydrogels for diverse molecular agents.
• To evaluate the influence of charge complementarity between hydrogel and cargo.

Main Methods:

• Synthesis of cationic and anionic Fmoc-Phe hydrogels.
• Systematic examination of cargo release using cationic, anionic, and neutral molecules.
• Analysis of electrostatic interactions governing cargo retention and release kinetics.

Main Results:

• Cargo molecules were generally released readily from the Fmoc-Phe hydrogels.
• Cargo retention was significantly enhanced when hydrogel and cargo possessed complementary electrostatic charges.
• Electrostatic interactions play a crucial role in modulating drug release profiles.

Conclusions:

• Electrostatic characteristics of both the hydrogel network and cargo are critical for drug delivery.
• Tailoring hydrogel and cargo charges allows for controlled and sustained release of therapeutics.
• These findings advance the development of next-generation LMW supramolecular hydrogel drug delivery systems.