title: Optimization of adsorption conditions of papain on dye affinity membrane using response surface methodology.
abstract: The adsorption of papain on Reactive Blue 4 dye-ligand affinity membrane was investigated in a batch system. The combined effects of operating parameters such as initial pH, temperature, and initial papain concentration on the adsorption were analyzed using response surface methodology. The optimum adsorption conditions were determined as initial pH 7.05, temperature 39 degrees C, and initial papain concentration 11.0mg/ml. At optimum conditions, the adsorption capacity of dye-ligand affinity membrane for papain was found to be 27.85 mg/g after 120 min adsorption. The papain was purified 34.6-fold in a single step determined by fast protein liquid chromatography. More than 85% of the adsorbed papain was desorbed using 1.0M NaCl at pH 9.0 as the elution agent. The purification process showed that the dye-ligand immobilized composite membrane gave good separation of papain from aqueous solution.
authors.affiliation: College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, No. 2999 North Renmin Road, Shanghai 201620, China.
authors.forename: Sai-Nan
authors.initials: SN
authors.lastname: Su
authors.forename: Hua-Li
authors.initials: HL
authors.lastname: Nie
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Zhu
authors.forename: Tian-Xiang
authors.initials: TX
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D000704:Analysis of Variance; D002846:Chromatography, Affinity / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008567:Membranes, Artificial; D010206:Papain / Q000302:isolation & purification*; D013696:Temperature
chemical_list: D008024:Ligands; D008567:Membranes, Artificial; D010206:Papain