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Updated: Jan 29, 2026

Cell Co-culture Patterning Using Aqueous Two-phase Systems
Published on: March 26, 2013
Partial characterization of Bacillus pumilus catalase partitioned in poly(ethylene glycol)/sodium sulfate aqueous
Yonca Yuzugullu Karakus1, Semih Isik2
1a Department of Biology Faculty of Arts and Science , Kocaeli University , Kocaeli , Turkey.
Abstract:
Aqueous two-phase partitioning system (ATPS) was used to extract and purify catalase from Bacillus pumilus. The system parameters for effective purification of catalase were optimized. The best catalase recovery (123%) with a 4.6-fold purification was obtained in the bottom phase of ATPS including the mixture of 15% (w/w) PEG4000, 10% (w/w) Na2SO4 and 3% (w/w) NaCl at pH 5.0. The purified enzyme was characterized regarding its activity and stability. The highest enzyme activity was observed at pH 7.0 and 37 °C on hydrogen peroxide. The enzyme was quite stable at temperatures between 30 and 55 °C and a pH range of 7.0-9.0. The Km and Vmax values were determined from Lineweaver-Burk plot as 11 mM and 1667 µmole ml-1 min-1, respectively. Overall, it can be said that ATPS is a rapid, reasonable, straightforward and cost-effective process for catalase purification in comparison to the chromatographic methods.
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