title: Synthesis of L-lysine imprinted cryogels for immunoglobulin G adsorption.
abstract: L-Lysine imprinted poly(2-hydroxyethyl methacrylate-co-N-methacryloyl-L-aspartic acid) [P(HEMA-co-MAAsp)] cryogels were synthesized and characterized with Fourier transform infrared spectroscopy, scanning electron microscopy, surface area measurements, swelling, and squeezing tests. Specific surface area for imprinted cryogel was 34.2m(2)/g while the value was 21.3m(2)/g for non-imprinted cryogel. IgG adsorption from aqueous solution was examined in continuous mode examining the factors effecting adsorption capacity such as pH, concentration, flow rate, temperature, ionic strength, and incubation time. 0.5M NaCl was used as desorption agent. The IgG adsorption capacity was determined as 55.1 mg/g for 1.0 mg/mL IgG original concentration at 25.0°C while pH and flow rate were 7.0 and 0.5 mL/min, respectively. When human serum was used as IgG source, the removal of 90.4% of crude IgG was attained for 1/20 diluted plasma sample. The imprinted cryogel was used in ten successive cycles without significant loss in adsorption capacity. The cryogel was determined to be 1.79 times more selective to IgG than albumin and 1.45 times more selective than hemoglobin. The adsorption behavior well suited to Langmuir isotherm and the kinetics followed pseudo-second-order model. Thermodynamic parameters ΔH°, ΔS° and ΔG° for this adsorption process were also calculated.
authors.affiliation: Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.
authors.forename: Senem
authors.initials: S
authors.lastname: Çulha
authors.affiliation: Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.
authors.forename: Canan
authors.initials: C
authors.lastname: Armutcu
authors.affiliation: Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.
authors.forename: Lokman
authors.initials: L
authors.lastname: Uzun
authors.affiliation: Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey. Electronic address: senel@hacettepe.edu.tr.
authors.forename: Serap
authors.initials: S
authors.lastname: Şenel
authors.affiliation: Hacettepe University, Department of Chemistry, Beytepe, Ankara, Turkey.
authors.forename: Adil
authors.initials: A
authors.lastname: Denizli
mesh_terms: D000327:Adsorption; D059985:Cryogels / Q000737:chemistry*; D006454:Hemoglobins / Q000737:chemistry; D006801:Humans; D007074:Immunoglobulin G / Q000737:chemistry*; D008239:Lysine / Q000737:chemistry*; D012709:Serum Albumin / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D059985:Cryogels; D006454:Hemoglobins; D007074:Immunoglobulin G; D012709:Serum Albumin; D008239:Lysine
keywords: Cryogel; Epitope imprinting approach; IgG; N-methacryloyl-l-aspartic acid; l-Lysine