Data/hora: 09/06/2024 04:26:06

Provedor de dados: | 91
País: | Brazil
Título: | Effect of nutrient sources on bench scale vinegar production using response surface methodology
Autores: | Ferreira,Joelma M.; Swarnakar,Ramdayal; Silva,Flávio L. H. da.
Data: | 2005-03-01
Ano: | 2005
Palavras-chave: | Factorial design; Acetic fermentation; Ethanol; Fermentation process.
Resumo: | The present work aims to evaluate on a bench scale, the effects of nitrogen and phosphorous nutrient source concentrations in vinegar production, a process that is used by small scale industries in the State of Paraiba. The response surface methodology has been utilized for modeling and optimization of the fermentation process. Initially a 2³ complete factorial design was used, where the effects of initial concentrations of ethyl alcohol, phosphorous and nitrogen sources were observed. After this analysis the concentration range of the nutrient variables were extended and a two level plus a star configuration factorial experimental design was performed. The experimental values are well represented by the linear and quadratic model equations obtained. The optimum concentration of ethanol was 4% in which the yield and the productivity of the acetic acid were maximized to the values of 70% and 0.87 g L-1 h-1 respectively, for a 24 hours fermentation period. The evaluation of the quadratic models showed that the yield of vinegar is maximized from 28.1 to 51.04% and the productivity from 0.69 to 1.29 g L-1 h-1 when the concentration of the nitrogen nutrient in the medium is increased from 0.2 to 2.3 g mL-1. Thus, at the optimized nitrogen nutrient concentration both the yield and the productivity of the vinegar are increased by 1.85 times.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662005000100011
Editor: | Departamento de Engenharia Agrícola  - UFCG
Relação: | 10.1590/S1415-43662005000100011
Formato: | text/html
Fonte: | Revista Brasileira de Engenharia Agrícola e Ambiental  v.9 n.1 2005
Fonte: | info:eu-repo/semantics/openAccess