标题：The optimization of aqueous two-phase extraction of lysozyme from crude hen egg white using response surface methodology
作者：Lu, Y.;Lu, W.;Wang, W.;Guo, Q.;Yang, Y.
作者机构：[Lu, Y] Key Laboratory for Special Functional Aggregated Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong Unive 更多
通讯作者地址：[Yang, YZ]Shandong Univ, Sch Chem & Chem Engn, 27 Shanda Nanlu, Jinan 250100, Peoples R China.
来源：Journal of Chemical Technology & Biotechnology
关键词：Aqueous two-phase system;Bioseparations;Extraction;Purification;Statistical design
摘要：Aqueous two-phase extraction is a versatile method for separating biological particles and macromolecules. In the present wok, the feasibility of using PEG 4000/potassium citrate aqueous two-phase system (ATPS) for recovering and purifying lysozyme was investigated. Response surface methodology was used to determine an optimized ATPS for purification of lysozyme from crude hen egg white. RESULTS: Mathematical models concerning the purification of lysozyme from chicken egg white in polyethylene glycol 4000 (PEG 4000)/potassium citrate ATPS are established using response surface methodology. Screening experiments using fractional factorial designs show that the pH of the system significantly affects the recovery and purification of lysozyme. An optimized ATPS was proved to be at pH 5.5 and 30 °C and contained 18% (w/w) PEG, 16% (w/w) potassium citrate, 3.75% (w/w) potassium chloride (KCl). Under those conditions, the specific activity, purification factor and activity yield for lysozyme were 31100 U mg~(-1), 21.11 and 103%, respectively. CONCLUSION: The PEG 4000/potassium citrate ATPS has the potential to be applied to establish bioprocesses for the primary recovery and partial purification of lysozyme.