Crown Ether-Functionalized Polyethersulfone Membranes with Potential Applications in Hemodialysis

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Polyethersulfone (PES) is widely used for hemodialysis membranes due to biocompatibility and high permeability.
• Current PES membranes require improved anticoagulant properties to minimize blood-related complications.
• Blood coagulation involves calcium ions (Ca²⁺), making their complexation a target for anticoagulant strategies.

Purpose of the Study:

• To enhance the anticoagulant properties of polyethersulfone (PES) hemodialysis membranes.
• To investigate the efficacy of chemical modification with crown ether for Ca²⁺ complexation.
• To characterize the modified membranes and evaluate their calcium ion retention capabilities.

Main Methods:

• Plasma treatment of commercial PES membranes using argon and ammonia.
• Chemical functionalization of plasma-treated membranes with 4'-aminobenzo-15-crown-5 ether.
• Physico-chemical and morphological characterization using FT-IR, XPS, TGA, SEM, and CT.
• Evaluation of calcium ion retention using Inductively Coupled Plasma Mass Spectrometry (ICP-MS).

Main Results:

• Plasma treatment effectively introduced nitrogen-containing functional groups onto the PES surface.
• These functional groups facilitated successful covalent attachment of the crown ether.
• Calcium ion (Ca²⁺) retention by the modified PES membranes increased by up to 30%.

Conclusions:

• Plasma treatment followed by crown ether modification is a viable strategy to improve PES hemodialysis membrane properties.
• The enhanced Ca²⁺ retention suggests improved anticoagulant performance, potentially reducing thrombogenicity.
• This approach offers a promising avenue for developing safer and more effective hemodialysis membranes.