tailieunhanh - Báo cáo "Phân tách protease ngoại bào của Bacillus subtilis trong hệ hai pha nước PEG/Potassium phosphate "

Phân tách protease ngoại bào của Bacillus subtilis trong hệ hai pha nước PEG/Potassium phosphate | Tạp chỉ Công nghệ Sinh học 6 3 375-382 2008 PARTITIONING OF EXTRACELLULAR PROTEASE FROM BACILLUS SUBTILIS IN PEG POTASSIUM PHOSPHATE AQUEOUS TWO-PHASE SYSTEMS Nguyen Hoang Loc1 Luu Thi Nguyet Minh1 Do Thi Bich Thuy2 1 Institute of Resources Environment and Biotechnology Hue University 2College of Agriculture and Forestry Hue University SUMMARY The aqueous-two phase system ATPS has a great potential for use in the downstream processing of fermentation products. The partitioning of extracellular protease from Bacillus subtilis CIO culture was carried out in ATPS formed by polyethylene glycol PEG Zpotassium phosphate. Factors that influenced the partition of the exưacellular protease in this system including the concentration and molecular weight of the PEG and the potassium phosphate concentration were investigated. The optimal ATPS was 20 w w PEG 6000 and 15 w w potassium phosphate pH . The partition coefficient for extracellular protease Xprotease was with a top phase yield T of at room temperature. The extracellular protease specific activity of the top phase was unit mg in the same system. This process therefore is suggested to be a rapid and convenient method for protease purification. Keywords Aqueous two-phase system Bacillus phosphate protease INTRODUCTION The aqueous two-phase system ATPS is widely used in biochemistry and biotechnology for purification of proteins enzymes and other labile biomolecules from crude cell or free-cell extracts or other mixtures Xu et al. 2005 . The ATPS is typically created by mixing solutions of PEG and dextran or PEG and salts such as potassium phosphate sodium phosphate or ammonium sulphate to form two immiscible phases. Proteins and cellular debris show differential solubility between the two phases so that the technique can be used both for the separation of proteins from cellular debris and for the partitioning of enzymes during protein purification Scawen Hammond 2002 . Most often this technique is .

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