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Adsorption of trypsin onto magnetic ion‐exchange beads of poly(glycidylmethacrylate‐ co ‐ethyleneglycoldimethacrylate)
Author(s) -
Arica M. Yakup,
Akyol Ali Berkan,
Bayramoğlu Gülay
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27062
Subject(s) - adsorption , ionic strength , glycidyl methacrylate , trypsin , langmuir adsorption model , materials science , ion exchange , bead , scanning electron microscope , bovine serum albumin , chemistry , chromatography , chemical engineering , analytical chemistry (journal) , polymerization , nuclear chemistry , aqueous solution , ion , composite material , organic chemistry , polymer , engineering , enzyme
Abstract Magnetic beads were prepared from glycidyl methacrylate (GMA), and ethyleneglycol dimethylmethacrylate (EGDMA) in the presence of Fe 3 O 4 nano‐powder via suspension polymerization. The magnetic beads were characterized by surface area measurement, electron spin resonance (ESR), and scanning electron microscopy (SEM). ESR data revealed that the beads were highly super‐paramagnetic. The effects of contact time, pH, ionic strength, and temperature on the adsorption process have been studied. Adsorption equilibrium was established in about 120 min. The maximum adsorption of trypsin on the magnetic beads was obtained as 84.96 mg g −1 at around pH 7.0. At increased ionic strength, the contribution of the electrostatic component to the overall binding decreased, and so the adsorption capacity. The experimental equilibrium data obtained trypsin adsorption onto magnetic beads fitted well to the Langmuir isotherm model. The result of kinetic analyzed for trypsin adsorption onto magnetic ion‐exchange beads showed that the second order rate equation was favorable. It was observed that after six adsorption–elution cycle, magnetic beads can be used without significant loss in trypsin adsorption capacity. Finally, the magnetic beads were used for separation of bovine serum albumin (BSA) and trypsin from binary solution in a batch system. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008