| Revista: | Electronic journal of biotechnology |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000359572 |
| ISSN: | 0717-3458 |
| Autores: | Sridee, Worawut1 Laopaiboon, Lakkana2 Jaisil, Prasit3 Laopaiboon, Pattana2 |
| Instituciones: | 1Khon Kaen University, Graduate School, Khon Kaen. Tailandia 2Khon Kaen University, Faculty of Technology, Khon Kaen. Tailandia 3Khon Kaen University, Faculty of Agriculture, Khon Kaen. Tailandia |
| Año: | 2011 |
| Volumen: | 14 |
| Número: | 6 |
| Paginación: | 3-3 |
| País: | Chile |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | Dried spent yeast (DSY) was used as a low-cost nitrogen supplement for ethanol fermentation from sweet sorghum juice under very high gravity (VHG) conditions by Saccharomyces cerevisiae NP 01. The fermentation was carried out at 30ºC in a 5-litre bioreactor. The results showed that DSY promoted ethanol production efficiencies. The ethanol concentration (P), productivity (Qp) and yield (Yp/s) of the sterile juice (total sugar of 280 g l-1) supplemented with 8 g l-1 of DSY were not different from those supplemented with yeast extract and/or peptone at the same amount. The initial yeast cell concentration of 5 x 107 cells ml-1 was found to be optimal for scale-up ethanol production. In addition, an increase in sugar concentration in inoculum preparation medium (from 10 to 100 g l-1) improved the ability of the inoculum to produce ethanol under the VHG conditions. When S. cerevisiae NP 01 grown in the juice containing 100 g l-1 of total sugar was used as the inoculum for ethanol fermentation, the P, Qp and Yp/s obtained were 108.98 ± 1.16 g l-1, 2.27 ± 0.06 g l-1 h-1 and 0.47 ± 0.01 g g-1, respectively. Similar results were also observed when the ethanol fermentation was scaled up to a 50-litre bioreactor under the same conditions. The cost of the sweet sorghum for ethanol production was US$ 0.63 per litre of ethanol. These results clearly indicate the high potential of using sweet sorghum juice supplemented with DSY under VHG fermentation for ethanol production in industrial applications |
| Disciplinas: | Química |
| Palabras clave: | Bioquímica, Fermentaciones, Química industrial, Bioetanol, Levadura seca, Ampliación, Jugo de sorgo dulce, Fermentación de alta gravedad, Biotecnología |
| Keyword: | Chemistry, Biochemistry, Fermentation, Industrial chemistry, Bioethanol, Dried yeast, Scale up, Sweet sorghum juice, High gravity fermentation, Biotechnology |
| Texto completo: | Texto completo (Ver PDF) |
