| Journal: | Brazilian journal of chemical engineering |
| Database: | PERIÓDICA |
| System number: | 000308870 |
| ISSN: | 0104-6632 |
| Authors: | Mastroeni, M.F1 Gurgel, P.V2 Silveira, M.M3 Mancilha, I.M. De Jonas, R Jonas, R4 |
| Institutions: | 1Universidade Federal de Vicosa, Departamento de Tecnologia de Alimentos, Vicosa, Minas Gerais. Brasil 2Universidade da Regiao de Joinville, Faculdade de Farmacia, Joinville, Santa Catarina. Brasil 3Centro de Desenvolvimento Biotecnologico, Joinville, Santa Catarina. Brasil 4Universidade de Caxias do Sul, Instituto de Biotecnologia, Caxias do Sul, Rio Grande do Sul. Brasil |
| Year: | 2003 |
| Season: | Jun |
| Volumen: | 20 |
| Number: | 2 |
| Pages: | 87-93 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | The influence of oxygen supply rate on the growth and the production of both ethanol and acetaldehyde by the aerotolerant fermentative bacterium Z. mobilis is discussed in this work. The results showed similar values of cell mass yield (0.043 g/g) for the five different levels of initial volumetric oxygen transfer coefficient (K La) studied. The maximum specific growth rate (µx,m.) under anaerobic conditions was higher than those found in aerated runs. Anaerobic cultivation resulted in the best ethanol yield (0.38 g/g). For initial K La values of 62, 94, and 118 h-1, ethanol yields were 0.10, 0.12, and 0.09 g/g, respectively, whereas for K La of 30 h-1, an intermediate value (0.24 g/g) was achieved. Under anaerobiosis, no acetaldehyde was produced. With initial K La values of 62, 94, and 118 h-1, acetaldehyde yields were similar (0.12 to 0.17 g/g), and for K La of 30 h-1 only 0.07 gram of acetaldehyde was formed per gram of glucose. Although increasing values for the maximal specific acetaldehyde formation rate were calculated as K La was increased, our results showed that the presence of an excess of dissolved oxygen throughout fermentation is enough to provide appropriate conditions for the production of acetaldehyde by Z. mobilis |
| Disciplines: | Química |
| Keyword: | Fermentaciones, Biotecnología, Acetaldehído, Etanol, Bioproducción, Tasa de suministro de oxígeno, Zymomonas mobilis |
| Keyword: | Chemistry, Fermentation, Biotechnology, Acetaldehyde, Ethanol, Bioproduction, Oxygen supply rate, Zymomonas mobilis |
| Full text: | Texto completo (Ver HTML) |
