Isolation and identification of a lipase producing Bacillus sp. from soil.
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 x 7H2O, 2 g L(-1) glucose, 0.6 mM MgCl2 and 15 ml L(-1) olive oil, pH 8.5 at 30 degrees C for 24 h and low agitation. The amount oflipase 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.
Heravi
Kambiz Morabbi
KM
Department of Microbiology, Faculty of Biological Sciences, Shahid Beheshti University, Chamran Highway, Evin, Tehran, Iran.
Eftekhar
Fereshteh
F
Yakhchali
Bagher
B
Tabandeh
Fatemeh
F
D001407:Bacillus / Q000201:enzymology*; D002474:Cell-Free System; D003001:Cloning, Molecular; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D007218:Industrial Microbiology / Q000379:methods*; D008049:Lipase / Q000737:chemistry* / Q000502:physiology*; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry; D012336:RNA, Ribosomal, 16S / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry; D012492:Salts / Q000737:chemistry; D017423:Sequence Analysis, RNA; D012987:Soil; D012988:Soil Microbiology; D013696:Temperature
D003470:Culture Media; D000069463:Olive Oil; D010938:Plant Oils; D012336:RNA, Ribosomal, 16S; D012235:Rhodamines; D012492:Salts; D012987:Soil; D008049:Lipase; C029773:rhodamine B