| Autor: |
John Bavor, Paul Peiris, Julie L. Markham, Nan Fu |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Enzyme and Microbial Technology. 45:210-217 |
| ISSN: |
0141-0229 |
| DOI: |
10.1016/j.enzmictec.2009.04.006 |
| Popis: |
An efficient conversion of glucose and xylose is a requisite for a profitable process of bioethanol production from lignocellulose. Considering the approaches available for this conversion, co-culture is a simple process, employing two different organisms for the fermentation of the two sugars. An innovative fermentation scheme was designed, co-culturing immobilized Zymomonas mobilis and free cells of Pichia stipitis in a modified fermentor for the glucose and xylose fermentation, respectively. A sugar mixture of 30 g/l glucose and 20 g/l of xylose was completely converted to ethanol within 19 h. This gave a volumetric ethanol productivity of 1.277 g/l/h and an ethanol yield of 0.49–0.50 g/g, which is more than 96% of the theoretical value. Extension of this fermentation scheme to sugarcane bagasse hydrolysate resulted in a complete sugar utilisation within 26 h; ethanol production peaked at 40 h with a yield of 0.49 g/g. These values are comparable to the best results reported. Cell interaction was observed between Z. mobilis and P. stipitis . Viable cells of Z. mobilis inhibited the cell activity of P. stipitis and the xylose fermentation. Z. mobilis showed evidence of utilising a source other than glucose for growth when co-cultured with P. stipitis . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect