Citation
Arbakariya Ariff, . and Ismail Abdul Karim, . and Madihah Md Salleh, . The influence of fermentor operation on citric acid production by Aspergillus niger under nitrogen limitation. pp. 66-69. ISSN 1505-5337
Abstract
Production of citric acid has been studied using Aspergillus niger in batch continous and exponentially fed-batch fermentations. The fermentation were carried out using a one L stirred tank fermentor. In continous fermentation optimum citric acid production was obtained at a dilution rate of 0.07/h and a culture pH of 2.5. Fermentor productivity for batch continous and fed-batch fermentations were 0.025g/L.h 0.294 g/L.h and 0.061 g/L.h respectively. Although very high fermentor productivity was obtained in continous fermentation the steady state citric acid concentration in the outflow (4.2 g/L) was about one-third the maximum concentration of citric acid obtained in exponentially fed-batch culture (12.1 g/L). Yields based on nitrogen consumed for batch continous and fed-batch fermentation were 3.0 1.4 and 4.8 g citric acid/g ammonium sulphate respectively. In comparison with batch fermentation exponentially fed-batch fermentation improved citric acid production significantly in terms of yield and productivity.
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Abstract
Production of citric acid has been studied using Aspergillus niger in batch continous and exponentially fed-batch fermentations. The fermentation were carried out using a one L stirred tank fermentor. In continous fermentation optimum citric acid production was obtained at a dilution rate of 0.07/h and a culture pH of 2.5. Fermentor productivity for batch continous and fed-batch fermentations were 0.025g/L.h 0.294 g/L.h and 0.061 g/L.h respectively. Although very high fermentor productivity was obtained in continous fermentation the steady state citric acid concentration in the outflow (4.2 g/L) was about one-third the maximum concentration of citric acid obtained in exponentially fed-batch culture (12.1 g/L). Yields based on nitrogen consumed for batch continous and fed-batch fermentation were 3.0 1.4 and 4.8 g citric acid/g ammonium sulphate respectively. In comparison with batch fermentation exponentially fed-batch fermentation improved citric acid production significantly in terms of yield and productivity.
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | Summary (En) |
| AGROVOC Term: | fermentation |
| AGROVOC Term: | cultivation |
| AGROVOC Term: | Aspergillus niger |
| AGROVOC Term: | growth rate |
| AGROVOC Term: | citric acid |
| AGROVOC Term: | fermenters |
| Depositing User: | Ms. Norfaezah Khomsan |
| Date Deposited: | 12 Jun 2025 01:42 |
| Last Modified: | 12 Jun 2025 01:42 |
| URI: | http://webagris.upm.edu.my/id/eprint/17028 |
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