Data/hora: 01/06/2024 02:48:13

Provedor de dados: | 58
País: | Brazil
Título: | Comparative study between yeasts immobilized on alumina beads and on membranes prepared by two routes
Autores: | Kiyohara,Pedro K.; Lima,Urgel de Almeida; Santos,Helena de Souza; Santos,Persio de Souza.
Data: | 2003-06-01
Ano: | 2003
Palavras-chave: | Porous alumina; Channeled alumina; Immobilized yeast; Ethanol production.
Resumo: | Alumina channeled beads and rough surface membranes prepared from aqueous sols of fibrillar pseudoboehmite are able to immobilize yeasts for ethanol fermentation of sugar solutions. This paper describes comparative results of assays carried out with yeasts immobilized onto alpha-alumina beads and membranes prepared under two different conditions of processing and firing. The fermentation tests evaluated by the decrease of fermentable sugars, referred as Brix degrees per hour, indicated that the yeasts immobilized on beads had similar performance, probably because their surfaces, even being morphologically different, presented the same value of open porosity. One type of membrane (asymmetrical; precursor: pseudoboehmite; firing temperature 1,150ºC; crystal structure; alpha-alumina) had better performance than the other type (asymmetrical; precursor: fibrillar pseudoboehmite plus aluminum hydroxiacetate mixture; 1,150ºC; alpha-alumina) because the yeast cells entered into their porous interior through the surface slits, were immobilized and their growth was easier than on the external surface.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000200008
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822003000200008
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.34 n.2 2003
Fonte: | info:eu-repo/semantics/openAccess