title: Separation of enzymes by sequential macroaffinity ligand-facilitated three-phase partitioning.
abstract: Pectinase and cellulase were separated from a commercial enzyme preparation called Pectinex Ultra SP-L. This was carried out using a process called macroaffinity ligand-facilitated three-phase partitioning (MLFTPP). In this method, a water-soluble polymer is floated as an interfacial precipitate by adding ammonium sulfate and tert.-butanol. The polymer (appropriately chosen) in the presence of an enzyme for which it shows affinity, selectively binds to the enzyme and floats as a polymer-enzyme complex. In the first step, pectinase was purified (with alginate as the polymer) 13-fold with 96% activity recovery. In the second MLFTPP step, using chitosan, cellulase was purified 16-fold with 92% activity recovery. Both preparations showed a single band on sodium dodecylsulfate-polyacrylamide gel electrophoresis. This illustrative example shows that the strategy of sequential MLFTPP can be used to separate important biological activities from a crude broth.
authors.affiliation: Chemistry Department, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India.
authors.forename: Aparna
authors.initials: A
authors.lastname: Sharma
authors.forename: Kalyani
authors.initials: K
authors.lastname: Mondal
authors.forename: Munishwar Nath
authors.initials: MN
authors.lastname: Gupta
mesh_terms: D000345:Affinity Labels; D002480:Cellulase / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008024:Ligands; D011096:Polygalacturonase / Q000302:isolation & purification*
chemical_list: D000345:Affinity Labels; D008024:Ligands; D011096:Polygalacturonase; D002480:Cellulase