title: Rapid process for purification of an extracellular beta-xylosidase by aqueous two-phase extraction.
abstract: A rapid process for purification of an extracellular beta-xylosidase with high purity was developed. The manipulation involved the precipitation of protein from culture medium and the extraction of enzyme from the resuspended crude protein solution by an aqueous-two phase separation. A linear random copolymer, PE62, with 20% ethylene oxide and 80% propylene oxide was employed in both stages of the purification. The enzyme was precipitated effectively by using 10% (w/v) PE62 and 5% (w/v) Na2HPO4. The aqueous two-phase extraction was performed with PE62 (10%)-NaH2PO4 (15%) as phase-forming reagent. SDS-PAGE analysis revealed that the purified enzyme is near homogeneity. The yield is about 100% with a purification factor of 8.8-fold. The whole process can be completed within an hour without any column chromatography.
authors.affiliation: Applied Chemistry Department, National Chiao Tung University, Hsin-Chu, Taiwan.
authors.forename: I H
authors.initials: IH
authors.lastname: Pan
authors.forename: Y K
authors.initials: YK
authors.lastname: Li
mesh_terms: D011232:Chemical Precipitation; D004591:Electrophoresis, Polyacrylamide Gel; D000431:Ethanol; D005285:Fermentation; D010710:Phosphates; D011108:Polymers; D014867:Water; D014995:Xylosidases / Q000302:isolation & purification*
chemical_list: D010710:Phosphates; D011108:Polymers; D014867:Water; D000431:Ethanol; D014995:Xylosidases; C026579:exo-1,4-beta-D-xylosidase