Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 3 de 3
Filtrar
Añadir filtros








Intervalo de año
1.
Braz. j. microbiol ; 49(supl.1): 151-159, 2018. tab, graf
Artículo en Inglés | LILACS | ID: biblio-974324

RESUMEN

Abstract To reduce the cost of obtaining bacterial cellulose, acidic by-products of the alcohol and dairy industries were used without any pretreatment or addition of other nitrogen sources. Studies have shown that the greatest accumulation of bacterial cellulose (6.19 g/L) occurs on wheat thin stillage for 3 days of cultivation under dynamic conditions, which is almost 3 times higher than on standard Hestrin and Schramm medium (2.14 g/L). The use of whey as a nutrient medium makes it possible to obtain 5.45 g/L bacterial cellulose under similar conditions of cultivation. It is established that the pH of the medium during the growth of Gluconacetobacter sucrofermentans B-11267 depends on the feedstock used and its initial value. By culturing the bacterium on thin stillage and whey, there is a decrease in the acidity of the waste. It is shown that the infrared spectra of bacterial cellulose obtained in a variety of environments have a similar character, but we found differences in the micromorphology and crystallinity of the resulting biopolymer.


Asunto(s)
Residuos/análisis , Microbiología Industrial/métodos , Celulosa/biosíntesis , Gluconacetobacter/metabolismo , Residuos/economía , Triticum/metabolismo , Triticum/microbiología , Microbiología Industrial/economía , Industria de Alimentos , Medios de Cultivo/economía , Medios de Cultivo/metabolismo , Gluconacetobacter/crecimiento & desarrollo , Etanol/metabolismo
2.
Artículo en Inglés | LILACS-Express | LILACS, VETINDEX | ID: biblio-1469653

RESUMEN

Abstract To reduce the cost of obtaining bacterial cellulose, acidic by-products of the alcohol and dairy industries were used without any pretreatment or addition of other nitrogen sources. Studies have shown that the greatest accumulation of bacterial cellulose (6.19 g/L) occurs on wheat thin stillage for 3 days of cultivation under dynamic conditions, which is almost 3 times higher than on standard Hestrin and Schramm medium (2.14 g/L). The use of whey as a nutrient medium makes it possible to obtain 5.45 g/L bacterial cellulose under similar conditions of cultivation. It is established that the pH of the medium during the growth of Gluconacetobacter sucrofermentans B-11267 depends on the feedstock used and its initial value. By culturing the bacterium on thin stillage and whey, there is a decrease in the acidity of the waste. It is shown that the infrared spectra of bacterial cellulose obtained in a variety of environments have a similar character, but we found differences in the micromorphology and crystallinity of the resulting biopolymer.

3.
Electron. j. biotechnol ; 14(2): 6-6, Mar. 2011. ilus, tab
Artículo en Inglés | LILACS | ID: lil-591936

RESUMEN

Background: Owing to the growing interest in biofuels, the concept of a biorefinery where biomass is converted to a variety of useful products is gaining ground. We here present how distillery waste is combined with a by-product from a sugar production, molasses, to form a medium for the growth of Lactobacillus plantarum with yields and biomass densities comparable with conventional industrial media. Such approach enables a cost-effective utilization of the problematic wastewater from ethanol and a by-product from sugar production. It is the first approach that attempts to find low-cost media for the production of Lactobacillus plantarum biomass. Results: This study suggests that sieved wheat stillage enriched by adding 1.77 g/l yeast extract and 10 percent molasses (v/v), with NH4OH used for pH adjustment, may be used as a media for large-scale cultivation of L. plantarum. Such composition of the medium permits a high density of lactic acid bacteria (1.6 x 10(10) cfu/ml) to be achieved. Conclusions: The use of a fermentation medium consisting of distillery wastewater and molasses to obtain value-added products (such as LAB biomass and lactic acid) is a possible step for classical ethanol production to move towards a biorefinery model production in which all by and waste products are utilized to increase produced values and reduce waste production. This enables a cost-effective utilization of the problematic wastewater from ethanol and sugar production.


Asunto(s)
Hidróxidos/metabolismo , Lactobacillus plantarum/metabolismo , Melaza , Triticum/metabolismo , Biomasa , Técnicas de Cultivo , Destilación , Etanol , Fermentación , Concentración de Iones de Hidrógeno , Residuos Industriales , Ácido Láctico , Levaduras/metabolismo
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA