title: Purification of glucose oxidase from Aspergillus niger by liquid-liquid cationic reversed micelles extraction.
abstract: The aim of this work was to select the operating conditions for the extraction and recovery of glucose oxidase (GOX) by reversed micelles from mixtures of commercial enzyme and Aspergillus niger homogenates. For this purpose, the influence of the main operating parameters (pH, surfactant concentration, and presence of cell debris or not) on GOX extraction was investigated at 25 degrees C. Without cell debris, the highest yield of GOX activity recovery (90.8%) was obtained performing (a) the forward extraction in isooctane as solvent and hexanol and butanol as cosolvents at 76/6/18 ratio, pH 7.0, 0.2 M cetyl trimethylammonium bromide as cationic surfactant, and electric conductivity of 5.0 mS cm(-1) and (b) the backward extraction at pH 5.5. Forward and backward extractions furnished comparable results when using raw homogenate, which demonstrates a negligible impact of the presence of cell debris on the process. The highest extraction yield (94%) was obtained under the same forward and backward conditions adopted without cell debris. The promising results of this work suggest that the proposed methodology could be profitably exploited at an industrial level.
authors.affiliation: Biotechnology Interunit Graduation Program IPT/Butantã/USP, P.O. Box 66083, São Paulo SP, Brazil.
authors.forename: Luis Fernando Peffi
authors.initials: LF
authors.lastname: Ferreira
authors.forename: Maria Elena
authors.initials: ME
authors.lastname: Taqueda
authors.forename: Attilio
authors.initials: A
authors.lastname: Converti
authors.forename: Michele
authors.initials: M
authors.lastname: Vitolo
authors.forename: Adalberto
authors.initials: A
authors.lastname: Pessoa
mesh_terms: D001234:Aspergillus niger / Q000201:enzymology*; D002498:Centrifugation / Q000379:methods*; D005591:Chemical Fractionation / Q000379:methods*; D005949:Glucose Oxidase / Q000096:biosynthesis* / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D010865:Pilot Projects; D012996:Solutions; D012997:Solvents / Q000737:chemistry*
chemical_list: D008823:Micelles; D012996:Solutions; D012997:Solvents; D005949:Glucose Oxidase