Se diseñaron los biorreactores, utilizando principios de similitud; para la producción del alcohol etílico, se diseñó un biorreactor del tipo Lecho Empacado . Inmovilización de levaduras en residuos lignocelulósicos para la producción de etanol en biorreactor de lecho empacado. En las fermentaciones realizadas en los biorreactores de lecho empacado con el biocatalizador (soporte + levaduras), se logró obtener un aumento en la.

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Medir la masa combinada del filtro y pesar barco.

empacadi Table 3 presents the consolidated experiments matrix with the results obtained. Asamblea Reactor Colocar los componentes del reactor de acuerdo con el esquema de la Figura 1. We studied various techniques spectrophotometry, protein quantification and dry weight ; the better biorrsactor were obtained with the dry weight technique, which was modified to allow direct quantification of biomass immobilized on the carrier.

The results are not valid for the proposed protocol, because the negative values represent high quantity of cells on the carrier at the end of the de-immobilization process.

There is a great potential of lignocellulosic materials wood shavings, bagasse, corn leaves and corn cobfor use as carriers in the immobilization on an industrial scale, because the immobilization is easy, agro-industrial waste materials are found in large amounts and the quantity of immobilized biomass obtained is significant compared with the data reported by other authors. We have obtained better yields than the batch processes, currently being used on an industrial level. Journal of the Science of Food and Agriculture.

Consulte la tabla de Materiales para las especificaciones de tubos adicionales. Two different types of bioreactors were designed, using principles of similarity. The pH was set to 5.

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For the corn cob carrier, we obtained a P-value biorrdactor 0. Your institution must subscribe to JoVE’s Bioengineering section to access this content. Ajuste la bomba a 25 revoluciones min -1, estableciendo un caudal de 1,5 ml min This amount of immobilized biomass is significant compared to the values reported by other authors.


Please sign in or create an account. The productivities reached in fermentations with cells immobilized on corn leaves, corn cob, and wood shaving are similar to each other. Journal of Dairy Science. Series of three tubes were filled with 50 ml of water, isotonic solution and NaOH 0.

Table 2 shows the parameters obtained in the continuous fermentation. Study of the effect of size and flow rate for each material To determine the effect on immobilization of flow rate and the ledho size, we performed a factorial experimental design with 2 factors re 2 levels, and a central point with three replicates. How to cite this article. We kindly thank the Biotechnology and Biotransformation Groups of the Universidad de Antioquia for their support.

These results indicate that, despite of the total absence of sugars at the end of fermentation, not all of them were converted to ethanol. En un matraz aforado de 1 L, se disuelven However, the treatments with NaOH 0. Recibido el 5 de abril de Unable to load video.

Immobilization yeasts cells, bioethanol, biofuels, lignocellulosic carriers, continuous fermentation. For flow rate we considered the specifications of peristaltic pumps available in the laboratory and the residence time established previously in the bioreactor used.

Biology of Microbial Communities – Interview. We evaluated four different waste lignocellulosic materials: As shown in the results of table 3, it is the cane bagasse the material on which the biggest quantity of biomass was immobilized. The production of ethanol obtained biorreeactor the output of the reactor was Since the packed bed bioreactor system has great operational stability and the results of fermentation with a volumetric productivity of 1.

Un biorreactor Novela de alta densidad de cultivo de diversas comunidades microbianas

The adsorption in these carriers can occur by different mechanisms, such as mechanical adsorption and retention in the pores of the carriers, adherence to the areas for different types of bonds and immobilization due to hydrophobic or biochemical interactions between carriers and cells.

Although in this process high temperatures are applied to reduce significantly the initial microbial load of materials, we found the need of sterilization before they were used in the immobilization. The pH was adjusted to 5.


Ethanol production began in the early hours of fermentation, but only provided an exponential accumulation by 6 hours after the process started. The characterization made it possible to establish the microscopic structural differences between the four materials, as well as the differences in composition of lignin, cellulose, hemicelluloses and ash. biorreacgor

Other methods of immobilization in relation to the union of the cells to the carrier are: We noticed that the system stabilizes when it passes the fourth time of residence 4 t. The kinectics of the immobilized cells was determined during 12 h in a batch fermentation with an initial amount of cells of 0.

In the first column the carriers studied are listed corn leaves, wood shavings, corn cob and cane bagasse. The aim of this study is to establish a process of cell immobilization on lignocellulosic waste and their potential use in the production of ethanol.

Modelado de reactores de lecho empacado en COMSOL®

Dyna, 73, However, an industrial implementation of this process requires further optimizations that allow for one to increase the amount of cells immobilized on the carriers, as well as improvements in the operational conditions of the process. The concentration of alcohol was determined by HPLC. However, as the contact of the cells with the carrier increases, and the fermentation time passes, we expected the immobilization to leccho on the oecho surface of the carrier.

Preparar 5 L de influente en total para poner en marcha el reactor.

The process of immobilization was carried out for 12 h. Analytic methods The total sugar quantification was performed by the DNS Biorreacctor acid colorimetric method.