title: Optimization of bovine serum albumin sorption and recovery by hydrogels.
abstract: Aqueous two-phase systems are composed of aqueous solutions of either two water-soluble polymers, usually polyethylene glycol (PEG) and dextran (Dx), or a polymer and a salt, usually PEG and phosphate or sulfate. Partitioning of proteins in such systems provides a powerful method for separating and purifying mixtures of biomolecules by extraction. If one of the phase forming polymers is a crosslinked gel, then the solution-controlled gel sorption may be considered as a modification of aqueous two-phase extraction. Since PEG/dextran systems are widely used in aqueous two-phase extraction and dextran gels (Sephadex) are common chromatographic media, we choose a PEG/dextran gel system as a model system in this study. The partitioning behavior of pure bovine serum albumin (BSA) in PEG/dextran gel systems is investigated to see the effects of variations in PEG and NaCl concentrations on the partition coefficient K. By making use of the Box-Wilson experimental design, K is shown to be maximized at 9.8 (%, w/w) PEG and 0.2 M NaCl concentrations, respectively, as 182.
authors.affiliation: Kimya Mühendisliği Bölümü, Mühendislik ve Mimarlik Fakültesi, Gazi Universitesi, 06570 Ankara, Turkey. ufzafer@gazi.edu.tr
authors.forename: Ufuk
authors.initials: U
authors.lastname: Gündüz
authors.forename: Asli
authors.initials: A
authors.lastname: Tolga
mesh_terms: D002852:Chromatography, Ion Exchange; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D012710:Serum Albumin, Bovine; D011092:Polyethylene Glycols