| Journal: | Brazilian journal of chemical engineering |
| Database: | PERIÓDICA |
| System number: | 000309089 |
| ISSN: | 0104-6632 |
| Authors: | Marton, J.M1 Felipe, M.G.A Almeida e Silva, J.B Pessoa-Junior, A2 |
| Institutions: | 1Faculdade de Engenharia Quimica de Lorena, Departamento de Biotecnologia, Lorena, Sao Paulo. Brasil 2Universidade de Sao Paulo, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Mar |
| Volumen: | 23 |
| Number: | 1 |
| Pages: | 9-21 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Xylitol has sweetening, anticariogenic and clinical properties that have attracted the attention of the food and pharmaceutical industries. The conversion of sugars from lignocellulosic biomass into xylitol by D-xylose-fermenting yeast represents an alternative to the chemical process for producing this polyol. A good source of D-xylose is sugarcane bagasse, which can be hydrolyzed with dilute acid. However, acetic acid, which is toxic to the yeast, also appears in the hydrolysate, inhibiting microbe metabolism. Xylitol production depends on the initial D-xylose concentration, which can be increased by concentrating the hydrolysate by vacuum evaporation. However, with this procedure the amount of acetic acid is also increased, aggravating the problem of cell inhibition. Hydrolysate treatment with powdered activated charcoal is used to remove or decrease the concentration of this inhibitor, improving xylitol productivity as a consequence. Our work was an attempt to improve the fermentation of Candida guilliermondii yeast in sugarcane bagasse hydrolysate by treating the medium with seven types of commercial powdered activated charcoals (Synth, Carbon Delta A, Carbon Delta G, Carbon 117, Carbon 118L, Carbon 147 and Carvorite), each with its own unique physicochemical properties. Various adsorption conditions were established for the variables temperature, contact time, shaking, pH and charcoal concentration. The experiments were based on multivariate statistical concepts, with the application of fractional factorial design techniques |
| Disciplines: | Química |
| Keyword: | Ingeniería química, Biotecnología, Bagazo de caña, Carbón activado, Hidrolisado hemicelulósico, Xilitol, Diseño factorial |
| Keyword: | Chemistry, Chemical engineering, Biotechnology, Sugarcane bagasse, Activated carbon, Hemicellulosic hydrolysate, Xylitol, Factorial design |
| Full text: | Texto completo (Ver HTML) |
