Lipase production by bacterial isolates from petroleum contaminated soil - DOI: 10.4025/actascitechnol.v32i1.7550

• Autor(a) principal: Feitosa, Ingrid Cavalcanti
• Data de Publicação: 2009
• Outros Autores: Barbosa, José Murillo de Pinho, Orellana, Sara Cuadros, Lima, Álvaro Silva, Soares, Cleide Mara Faria
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/7550
• topic: submerged fermentation; lipolytic activities; inducer; fermentação submersa; atividade lipolítica; indutor

Lipase production by bacterial isolates from petroleum contaminated soil. This paper aims to present alternatives to the production of lipolytic enzymes from microorganisms isolated from soil with a history of contact with oil from the region of Sergipe, by submerged fermentation using palm oil as inducer. The experiments were conduced in 250 mL Erlenmeyer flasks in a shaker (170 rpm), containing 125 mL (%, w v-1) of KH2PO4, MgSO4.7H2O, NaNO3, yeast extract, peptone and starch. The pH was 5.0 and 7.0; incubation temperature was 30 and 37°C, respectively; fermentation time was 24, 48, 72, 96h, 120 and 144h; and the inducer concentration was 3 and 4%, added after 72h of fermentation. The determination of lipolytic activity was examined at 37°C, in a shaker in thermostatic bath with rotation of 82 rpm, using gum arabic 7% (w v-1), olive oil and water. The reactions were conducted for 10 min with agitation and later stopped by the addition of an acetone:ethanol:water solution, where released fatty acids were titrated with a solution of KOH (0.04 N), using phenolphthalein as an indicator. The maximum activity was determined as 4369.75 U mL-1 pH 7.0 and a temperature of 37°C, with the percentage of the inducer oil palm to 4%.