Molecular recognition based iron removal from human plasma with imprinted membranes

Area of Science:

• Materials Science
• Biomedical Engineering
• Analytical Chemistry

Background:

• Human plasma iron(III) (Fe3+) overdose poses health risks.
• Selective removal of excess Fe3+ from biological fluids is challenging.
• Ion-imprinted polymers offer high specificity for target ion capture.

Purpose of the Study:

• To synthesize and characterize Fe3+-imprinted poly(2-hydroxyethyl methacrylate) (HEMA) based membranes.
• To evaluate the membranes' efficiency for selective Fe3+ removal from human plasma.
• To assess the reusability and selectivity of the developed membranes.

Main Methods:

• UV-initiated photo-polymerization of HEMA and N-methacryloyl-(L)-glutamic acid (MAGA) with Fe3+ complex.
• Template removal using ethylenediaminetetraacetic acid (EDTA).
• Characterization of membrane properties including surface area, swelling ratio, and elemental analysis.

Main Results:

• Synthesized Fe3+-imprinted poly(HEMA-MAGA) membranes exhibited a specific surface area of 49.2 m²/g and a swelling ratio of 92%.
• The membranes demonstrated a maximum adsorption capacity of 164.2 µmol Fe3+/g.
• High selectivity was observed, with relative selectivity coefficients for Fe3+/Zn2+ and Fe3+/Cr3+ being 12.6 and 62.5 times greater than the non-imprinted matrix, respectively.

Conclusions:

• Fe3+-imprinted poly(HEMA-MAGA) membranes are effective for selective Fe3+ removal.
• The membranes show excellent reusability without significant loss of adsorption capacity.
• These findings suggest potential clinical applications for treating Fe3+ overdose in human plasma.