PEG-sodium citrate aqueous two-phase systems to in situ recovery of protease from Aspergillus tamarii URM4634 by extractive fermentation
| Autor: | Osmar Soares da Silva, Raniele Oliveira Alves, Tatiana Souza Porto |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Molar mass Aqueous solution Enthalpy Bioengineering Polyethylene glycol 01 natural sciences Applied Microbiology and Biotechnology Gibbs free energy Partition coefficient 03 medical and health sciences chemistry.chemical_compound symbols.namesake 030104 developmental biology chemistry 010608 biotechnology Sodium citrate PEG ratio symbols Agronomy and Crop Science Food Science Biotechnology Nuclear chemistry |
| Zdroj: | Biocatalysis and Agricultural Biotechnology. 16:209-216 |
| ISSN: | 1878-8181 |
| Popis: | This paper investigates the influence of polyethylene glycol (PEG) molar mass, concentrations of PEG and sodium citrate, and pH, in situ recovery on protease produced by Aspergillus tamarii URM4634. A biochemical characterization study was conducted, and thermodynamic parameters were determined in the test which used 8000 (g/mol) PEG molar mass, PEG concentration 24% (w/w), sodium citrate concentration 20% (w/w) and pH 6.0 with partition coefficient of 35.0, activity yield of 98.4 and concentration factor of 2.14. This PEG-phase had an optimum pH and temperature of 8.0 and 60 °C, respectively, being inhibited by EDTA (83.3%) which indicated that this's a metalloprotease. The thermodynamic studies of the protease had an activation energy of 19.01 kJ/mol and a deactivation energy of 29.6 kJ/mol. It was in this range that the following estimates could be made: enthalpy of ΔH*d 29.7 kJ/mol, entropy of ΔS*d − 265.0 kJ/mol K and Gibbs free energy of 120.0 ≤ ΔG*d ≤ 125.9 kJ/mol. These results show a possible scaling-up of the bioreactor process which, under the conditions in the shaker flask, showed considerable values in the integrated production and extraction process, thus demonstrating the potential of this process for obtaining a high recovery of protease and similar products. |
| Databáze: | OpenAIRE |
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