Abstract
The production of gluconic acid with respect to varying substrate concentrations in submerged (SmF), semisolid-state (SmSF), surface (SF), and solid-state surface (SSF) fermentations was analyzed. Under the various fermentation conditions the biomass and specific growth rate varied with different concentrations of glucose. The highest level of gluconic acid (106.5 g dm-3) with 94.7% yield was obtained under SSF conditions. In all cases the maximum degree of gluconic acid conversion was observed at on initial substrate concentration of 120 g dm-3. The rate of glucose uptake increased on increasing the initial glucose concentration and glucose utilization was observed to be highest (89-94%) in the SmSF process and was comparable with the SSF and SF processes. The maximum rate of cell growth was obtained in all processes at an initial glucose concentration of 120 g dm-3. The gluconic acid production and change in pH were analyzed at varying time intervals and it was observed that the SmF and SmSF processes were completed within 6 days of incubation whereas the highest yield was observed after 12 days of incubation and continued thereafter in the SSF process.
Original language | English (US) |
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Pages (from-to) | 208-212 |
Number of pages | 5 |
Journal | Journal of Chemical Technology and Biotechnology |
Volume | 78 |
Issue number | 2-3 |
DOIs | |
State | Published - Feb 2003 |
Externally published | Yes |
Keywords
- Aspergillus niger
- Gluconic acid
- Semisolid-state fermentation
- Solid-state surface fermentation
- Submerged fermentation
- Surface fermentation
ASJC Scopus subject areas
- Biotechnology
- General Chemical Engineering
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Waste Management and Disposal
- Pollution
- Organic Chemistry
- Inorganic Chemistry