RESUMO
A new polymeric adsorbent to improve portable dialysis treatment by simplifying urea removal at the dialysate regeneration step is proposed. An adsorbent to remove urea was synthesized by molecular imprinting technology that can potentially overcome drawbacks existing in urease enzyme-based dialysate regeneration technology. Molecularly imprinted polymer (MIP) for urea generates cavities both in shape and in size targeted for urea. Using the synthesized MIP, we have shown removal of urea present in the dialysate buffer. Various experimental conditions such as choice of monomers, porogen, and template to monomer ratios were optimized to achieve highest binding capacity on a column flow through system monitored using high-performance liquid chromatography (HPLC). Taking advantage of the basicity of urea molecule, monomers having Brønsted acidic groups such as acrylic acid, methacrylic acid and itaconic acid were screened. The MIP synthesized using urea:acrylic acid:EGDMA (1:4:12) in acetonitrile:ethylene dichloride (1:1) as porogen gave highest binding capacity of 24.5 g/kg of urea in the dialysate buffer matrix.
