Por favor, use este identificador para citar o enlazar este ítem:
https://repositorio.ufba.br/handle/ri/15182
metadata.dc.type: | Artigo de Periódico |
Título : | Bioconversion from crude glycerin by xanthomonas campestris 2103: xanthan production and characterization |
Otros títulos : | Brazilian Journal of Chemical Engineering |
Autor : | Brandão, Líllian Vasconcellos Assis, Denilson de Jesus López, J. A. Espiridião, M. C. A. Echevarria, E. M. Druzian, Janice Izabel |
metadata.dc.creator: | Brandão, Líllian Vasconcellos Assis, Denilson de Jesus López, J. A. Espiridião, M. C. A. Echevarria, E. M. Druzian, Janice Izabel |
Resumen : | The production and rheological properties of xanthan gum from crude glycerin fermentation, a primary by-product of the biodiesel industry with environmental and health risks, were evaluated. Batch fermentations (28 °C/250 rpm /120 h) were carried out using crude glycerin, 0.01% urea and 0.1% KH2PO4, (% w/v), and compared to a sucrose control under the same operational conditions, using Xanthomonas campestris strain 2103 isolate from Brazil. Its maximal production by crude glycerin fermentation was 7.23±0.1 g·L-1 at 120 h, with an apparent viscosity of 642.57 mPa·s, (2 % w/v, 25 °C, 25 s-1), 70% and 30% higher than from sucrose fermentation, respectively. Its molecular weight varied from 28.2 to 36.2×106 Da. The Ostwald-de-Waele model parameters (K and n) indicated a pseudoplastic behavior at all concentrations (0.5 to 2.0 %, w/v) and temperatures (25-85 °C), while its consistency index indicated promising rheological properties for drilling fluid applications. Therefore, crude glycerin has potential as a cost-effective and alternative substrate for non-food grade xanthan production. |
Palabras clave : | Xanthan Biodiesel waste Xanthomonas isolate Drilling fluid |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI : | http://repositorio.ufba.br/ri/handle/ri/15182 |
Fecha de publicación : | oct-2013 |
Aparece en las colecciones: | Artigo Publicado em Periódico (PPEQ) |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
0104-66322013000400006.pdf | 316,16 kB | Adobe PDF | Visualizar/Abrir |
Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.