DOI: https://doi.org/10.21897/rmvz.235

Efecto de la sacarosa en la producción de celulosa por Gluconacetobacter xylinus en cultivo estático

Rubén Jaramillo L, Wladimir Tobio J, José Escamilla M

Resumen


RESUMEN

Objetivo. Determinar el efecto de sacarosa en la productividad de BC por Gluconacetobacter xylinus IFO 13693 en condición estática. Materiales y métodos. La síntesis de celulosa bacteriana (BC) por Gluconacetobacter xylinus se llevo a cabo en un cultivo estático discontinuo a temperatura ambiente, en presencia de sacarosa como la principal fuente de carbono a concentraciones iniciales de 0.8 a 7.6 % (p/v). Las concentraciones remanentes de BC, sacarosa, glucosa y fructosa se determinaron cada semana. Para la cinética de la hidrólisis de la sacarosa y formación de celulosa y el coeficiente de rendimiento del producto se utilizo el software Microcal Origin 6.0®. Resultados. En la cuarta semana los valores de BC se encontraron entre 32.5 a 39.5 g/L para las diferentes concentraciones de sacarosa. La cinética para la hidrólisis de sacarosa se ajusta al modelo de Michaelis-Menten, con una Vmax de 0.0002 mol L-1 h-1 y Km de 0.018 M. La producción de BC se ajusta al modelo propuesto por Marx-Figini y Pion, con un valor de la pendiente (kc), entre 0.0018 y 0.0024 h-1 para las diferentes concentraciones iniciales de sacarosa. Los coeficientes de rendimiento tienen valores de 0.8 a 2.4 g de BC producida/g de sacarosa consumida. Conclusiones. La hidrólisis de sacarosa, el consumo de glucosa y fructosa se refleja en la síntesis de celulosa. La hidrólisis de sacarosa y la producción de BC se ajustan a los modelos de Michaelis-Menten y al propuesto por Marx-Figini y Pion, respectivamente. Finalmente, el rendimiento depende de la concentración de sacarosa


Palabras clave


Cellulose; Gluconacetobacter xylinus; kinetics; sucrose

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Referencias


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