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https://hdl.handle.net/1822/27520
Título: | Influence of volumetric oxygen transfer coefficient (kLa) on xylanases batch production by Aspergillus niger van Tieghem in stirred tank and internal-loop airlift bioreactors |
Autor(es): | Michelin, Michele Mota, A. Polizeli, Maria de Lourdes T. M. Silva, Daniel Pereira da Vicente, A. A. Teixeira, J. A. |
Palavras-chave: | Bioreactors Xylanase ß-xylosidase Corncob Aspergillus k(L)a K a L β-Xylosidase |
Data: | 5-Mai-2013 |
Editora: | Elsevier 1 |
Revista: | Biochemical Engineering Journal |
Resumo(s): | Oxygenation is an important parameter involved in the design and operation of mixing-sparging bioreactors and it can be analyzed by means of the oxygen mass transfer coefficient (kLa). In this study, batch fermentations in stirred tank bioreactor (STB) and airlift bioreactor (ALB) were operated under a range of kLa values, in attempts to optimize and compare the activities of extracellular xylanase and β-xylosidase synthesized by the fungus Aspergillus niger van Tieghem, using corncob as inducer source. The higher xylanase levels were observed on STB (9000 U l−1; kLa = 30 h−1), while the β-xylosidase production was similar in both bioreactors. However, when the enzymatic activity was compared for the same kLa value (12 h−1) in STB and ALB, the xylanase and β-xylosidase productions were higher in ALB (7000 U l−1 xylanase; 2100 U l−1 β-xylosidase) than STB (4500 U l−1 xylanase; 1800 U l−1 β-xylosidase). |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/27520 |
DOI: | 10.1016/j.bej.2013.09.002 |
ISSN: | 1369-703X |
e-ISSN: | 1369-703X |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S1369703X1300243X-main.pdf | 1,16 MB | Adobe PDF | Ver/Abrir |