NAD-sensitive hydrogel for the release of macromolecules

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biochemical Engineering

Background:

• Hydrogel membranes are crucial for controlled substance transport.
• Developing stimuli-responsive materials for selective diffusion is an ongoing challenge.
• Affinity-based crosslinking offers a route to tunable hydrogel properties.

Purpose of the Study:

• To synthesize and characterize a novel hydrogel membrane with tunable porosity.
• To investigate the controlled diffusion of model proteins (cytochrome C and hemoglobin) through the hydrogel.
• To explore the use of competitive displacers to modulate protein transport.

Main Methods:

• Covalent immobilization of Cibacron blue (ligand) and lysozyme (receptor) onto dextran.
• Crosslinking of modified dextran to form stable hydrogel membranes.
• Protein transport experiments using a twin chamber diffusion cell.
• Assessment of nicotinamide adenine dinucleotide (NAD) as a competitive displacer.

Main Results:

• The synthesized hydrogels exhibited porosity sensitive to competitive displacers.
• Addition of NAD to the donor side increased protein diffusion in a saturable, concentration-dependent manner.
• The observed increase in diffusion of cytochrome C and hemoglobin was specific to NAD and reversible.

Conclusions:

• The developed hydrogel membrane demonstrates tunable permeability based on specific molecular interactions.
• This system offers a promising platform for controlled protein transport applications.
• The reversible nature of the response highlights its potential for dynamic separation and delivery systems.