Back to Search
Start Over
Optimal pH control strategy for high-level production of long-chain α,ω-dicarboxylic acid by Candida tropicalis
- Source :
-
Enzyme & Microbial Technology . Jan2004, Vol. 34 Issue 1, p73. 5p. - Publication Year :
- 2004
-
Abstract
- A mutant of Candida tropicalis was used to convert n-alkanes to the corresponding α,ω-dicarboxylic acids (DC). Effects of medium pH on dioic acid productions were studied in batch fermentations in which growth and conversion were separated into a growth and a conversion phase. A pH control strategy for the high-level production of α,ω-tridecanedioic acid has been proposed and optimized, i.e. programmed incremental pH increase from pH 7.2 to 8.10 during DC production stage, the dioic acid concentration reached 153 g/l after 120 h transformation and demonstrated a 22% increase in production compared to that obtained with an optimized constant pH value. Using the optimal strategy for n-dodecane and n-tetradecane fermentation, the corresponding dioic acid concentrations reached 166 and 138 g/l, respectively. The influences of the strategy on cytochrome P450 monooxygenase activity of the cells were also examined; the maximum activity of the enzyme can be maintained for a longer period of time during the conversion phase using by this optimal strategy. [Copyright &y& Elsevier]
- Subjects :
- *CANDIDA tropicalis
*GENETIC mutation
*HYDROGEN-ion concentration
*FERMENTATION
Subjects
Details
- Language :
- English
- ISSN :
- 01410229
- Volume :
- 34
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Enzyme & Microbial Technology
- Publication Type :
- Academic Journal
- Accession number :
- 11608841
- Full Text :
- https://doi.org/10.1016/j.enzmictec.2003.09.001