Modeling of the production of xylitol from d-xylose in a batch and continuous membrane bioreactor
Braz. j. microbiol
;
31(supl.1): 73-8, Oct. 2000. ilus, tab, graf
Artículo
en Inglés
| LILACS
| ID: lil-300571
RESUMO
This work presents a mathematical model that describes of the behavior of the main variable involved in the continuous bioconversion of xylose to xylitol by Candida guilliermondii in a stirred-tank bioreactor with total cell recycle, a promising process to obtain this polyol because it increases productivity in function of the high cellular density. The fermentation system was modeled considering cellular mass, xylose, xylitol and dissolved oxygen concentrations, as well as xylose reductase enzymatic activit as dependent variables. The model is based on the assumption of the intra/extracellular xylitol transport and it is able to represent inhibition by xylose on the main intracellular reaction (conversion of xylose to xylitol by xylose reductase) as well as the influence of the oxygen limitation in all steps of the bioconversion. The results of the mathamatical model simulation were compared to experimental data. The model represents quite well the yeast performance in the production of xylitol.
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Índice:
LILACS (Américas)
Asunto principal:
Xilitol
/
Técnicas In Vitro
/
Reactores Biológicos
/
Pruebas Enzimáticas Clínicas
/
Enzimas
Tipo de estudio:
Estudio pronóstico
Idioma:
Inglés
Revista:
Braz. j. microbiol
Asunto de la revista:
Microbiologia
Año:
2000
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
COPPE-UFRJ. Programa de Eng. Química/BR
/
EQ-UFRJ. Dept. de Eng. Bioquímica/BR
/
FAENQUIL-Lorena. Dept.de Eng. Química/BR
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