Data/hora: 24/09/2024 08:38:13

Biblioteca(s): 	Embrapa Agroindústria de Alimentos; Embrapa Instrumentação.	
Data corrente: 	03/10/2011	
Data da última atualização: 	29/01/2019	
Autoria: 	FARINAS, C. S.; VITCOSQUE, G. L.; FONSECA, R. F.; BERTUCCI NETO, V.; COURI, S.	
Afiliação: 	CRISTIANE SANCHEZ FARINAS, CNPDIA; VICTOR BERTUCCI NETO, CNPDIA.	
Título: 	Modeling the effects of solid state fermentation operating conditions on endoglucanase production using an instrumented bioreactor.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Industrial crops and products, [S. l.], v. 34, n. 1, p. 1186-1192, 2011.	
ISSN: 	0926-6690	
DOI: 	10.1016/j.indcrop.2011.04.006	
Idioma: 	Inglês	
Conteúdo: 	Cellulase production is one of the most critical steps in the economics of second generation ethanol. Although solid-state fermentation (SSF) is an attractive process for the production of enzymes, SSF is highly limited by the difficulty in controlling the operating variables which affect microbial growth and metabolites production. In this context, this work evaluates the effects of operational conditions on endoglucanase production by a selected strain of Aspergillus niger cultivated under SSF using an instrumented lab-scale bioreactor equipped with an on-line automated monitoring and control system. The effects of air flow rate, inlet air relative humidity and substrate initial moisture on endoglucanase production were evaluated using a statistical design methodology. A correlation coefficient of 0.9106 and a calculated value of F, 5.46 folds higher than the listed value (P-value < 0.05) allowed the modeling of endoglucanase production under different process conditions. Higher endoglucanase production (56.1 U/g) was achieved for a selected condition of substrate initial moisture of 72%, air inlet humidity of 70%, and flow rate of 20 mL/min. A significant increase in endoglucanase production was also found to be achieved under forced aeration conditions (50.2 IU/g) compared to static conditions (29.8 IU/g) after 72 h of cultivation. Besides, respirometric analysis revealed that the total amount of CO2 produced was linearly correlated with enzyme production (R2 of 0.988). The bioreactor system used, as well as the methodology employed herein, was very effective in evaluating the influence of operational variables on enzymes production under SSF.	
Palavras-Chave: 	Bioetanol; Bioreactor; Biorreator; Cellulase; Endoglucanase; Enzimas; Fermentação em estado sólido; Solid-state fermentation.	
Thesagro: 	Celulase; Enzima; Fermentação.	
Thesaurus Nal: 	Bioethanol; Enzymes.	
Categoria do assunto: 	--
X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (13363-1) - UPC - AP - DD - PROCI-11.00038 -  - 2011.00038 - DIS
CTAA - (11052-1) - UPC - AP - PP - 2011/071 -  - 2011.00373 - DIS