Methacryloylamidoglutamic acid having porous magnetic beads as a stationary phase in metal chelate affinity chromatography

Altintas E., Yavuz H., Say R., Denizli A.

JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION, vol.17, no.1-2, pp.213-226, 2006 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 17 Issue: 1-2
  • Publication Date: 2006
  • Doi Number: 10.1163/156856206774879045
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.213-226
  • Keywords: affinity chromatography, metal-chelate affinity beads, glutamic acid, cytochrome c, PHEMA, PROTEIN ADSORPTION, PURIFICATION, SORBENTS, EXCHANGE, EQUILIBRIUM, MEMBRANES, SUPPORTS
  • Anadolu University Affiliated: No


We have prepared a novel magnetic metal-chelate adsorbent utilizing methacryloylamidoglutamic acid (MAGA) as a metal-chelating ligand. MAGA was synthesized by using methacryloyl chloride and L-glutamic acid dihydrochloride. Magnetic beads with an average diameter of 50-100 mu m were produced by suspension polymerization of 2-hydroxyethyl methacrylate (HEMA) and MAGA in the presence of Fe3O4 particles carried out in an aqueous dispersion medium. Magnetic beads were charged with the Cu2+ ions directly via MAGA for the adsorption of cytochrome c (cyt c) from aqueous solutions. The maximum cyt c adsorption capacity of the Cu2+-chelated beads (0.86 mmol/g Cu2+ loading) was found to be 37 mg/g at pH 8.0 in phosphate buffer. Cyt c adsorption on the poly(HEMA-MAGA) beads was 15.4 mg/g. Cu2+ charging increased the cyt c adsorption significantly (37 mg/g). Cyt c adsorption decreased with increasing temperature. Cyt c molecules could be adsorbed and desorbed five times with these adsorbents without noticeable loss in their cyt c adsorption capacity. The resulting magnetic chelator beads posses excellent long term storage stability.