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A feasible enzymatic process for D-tagatose production by an immobilized thermostable L-arabinose isomerase in a packed-bed bioreactor.
- Source :
-
Biotechnology progress [Biotechnol Prog] 2003 Mar-Apr; Vol. 19 (2), pp. 400-4. - Publication Year :
- 2003
-
Abstract
- To develop a feasible enzymatic process for d-tagatose production, a thermostable l-arabinose isomerase, Gali152, was immobilized in alginate, and the galactose isomerization reaction conditions were optimized. The pH and temperature for the maximal galactose isomerization reaction were pH 8.0 and 65 degrees C in the immobilized enzyme system and pH 7.5 and 60 degrees C in the free enzyme system. The presence of manganese ion enhanced galactose isomerization to tagatose in both the free and immobilized enzyme systems. The immobilized enzyme was more stable than the free enzyme at the same pH and temperature. Under stable conditions of pH 8.0 and 60 degrees C, the immobilized enzyme produced 58 g/L of tagatose from 100 g/L galactose in 90 h by batch reaction, whereas the free enzyme produced 37 g/L tagatose due to its lower stability. A packed-bed bioreactor with immobilized Gali152 in alginate beads produced 50 g/L tagatose from 100 g/L galactose in 168 h, with a productivity of 13.3 (g of tagatose)/(L-reactor.h) in continuous mode. The bioreactor produced 230 g/L tagatose from 500 g/L galactose in continuous recycling mode, with a productivity of 9.6 g/(L.h) and a conversion yield of 46%.
- Subjects :
- Enzyme Activation
Enzyme Stability
Enzymes, Immobilized chemical synthesis
Enzymes, Immobilized chemistry
Escherichia coli enzymology
Escherichia coli genetics
Escherichia coli metabolism
Feasibility Studies
Hexoses chemistry
Hydrogen-Ion Concentration
Isomerism
Quality Control
Recombinant Proteins chemistry
Recombinant Proteins metabolism
Temperature
Aldose-Ketose Isomerases chemistry
Bioreactors
Cell Culture Techniques methods
Galactose chemistry
Hexoses chemical synthesis
Subjects
Details
- Language :
- English
- ISSN :
- 8756-7938
- Volume :
- 19
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Biotechnology progress
- Publication Type :
- Academic Journal
- Accession number :
- 12675579
- Full Text :
- https://doi.org/10.1021/bp025675f