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Pakistan Journal of Biological Sciences
  Year: 2008 | Volume: 11 | Issue: 5 | Page No.: 740-745
DOI: 10.3923/pjbs.2008.740.745
Isolation and Identification of a Lipase Producing Bacillus sp. from Soil
Kambiz Morabbi Heravi, Fereshteh Eftekhar, Bagher Yakhchali and Fatemeh Tabandeh

Lipase production in an indigenous lipolytic Bacillus sp. was detected in media containing Tributyrin-Tween 80 and Rhodamine B-Olive oil. The statistical Taguchi model was used to predict the optimum experimental conditions for bacterial growth and lipase production. Partial optimization was carried out for selection of salt base, oil, glucose, NH4Cl and yeast extract concentrations, inoculum density, pH and agitation. Maximum lipase activity was detected in the cell free supernatants of cultures grown in a medium containing 10 g L-1 yeast extract, 15 g L-1 NH4Cl, 3 g L-1 K2HPO4, 1 g L-1 KH2PO4, 0.1 g L-1 MgSO4.7H2O, 2 g L-1 glucose, 0.6 mM MgCl2 and 15 ml L-1 olive oil, pH 8.5 at 30 °C for 24 h and low agitation. The amount of lipase produced in the designed medium was in agreement with the predicted values by the statistical method. 16S rRNA cloning and sequencing identified the test organism as Bacillus pumilus.
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