Isolation, Screening and Production of Extracellular Alkaline Lipase from a Newly Isolated Bacillus sp. PD-12

Research Article

**Isolation, Screening and Production of Extracellular Alkaline Lipase from a Newly Isolated Bacillus sp. PD-12**

Praveen Dahiya and Sharmishtha Purkayastha

There is limited available information on the characterization of alkali-stable Bacillus sp. producing lipase and its commercial production. Therefore, thirty bacterial strains were isolated from oil industry soil samples and were screened for lipolytic activity. Bacillus sp. PD-12 was selected for lipase production because of its high lipolytic activity (4.2 IU mL^-1). Bacillus sp. PD-12 lipase was optimally active at pH 8.0 and at 40°C temperature. The lipase is capable of hydrolyzing vegetable oils and synthetic triglycerides. Maximum lipase production by Bacillus sp. PD-12 was obtained when grown under shaking conditions (250 rpm) at 30°C for 24 h. In order to increase lipase production, optimization of carbon and nitrogen sources was studied. Maximum lipolytic activity (4.25±0.020 IU mL^-1) was obtained with olive oil as a carbon source followed by coconut oil (2.5±0.030 IU mL^-1). Among nitrogen sources, ammonium nitrate resulted in maximum lipolytic activity (15.6±0.036 IU mL^-1). Lipase production by Bacillus sp. PD-12 was studied in a 3 liter fermentor with a working volume of 1.8 liter under optimized conditions resulted in lipolytic activity of 22 IU mL^-1 after 21 h. Thus, short fermentation time (21 h) makes this fermentation system a promising one in terms of lipase productivity and alkali-stable Bacillus sp. can be used in detergent industry.

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Praveen Dahiya and Sharmishtha Purkayastha, 2011. Isolation, Screening and Production of Extracellular Alkaline Lipase from a Newly Isolated Bacillus sp. PD-12. Journal of Biological Sciences, 11: 381-387.

DOI: 10.3923/jbs.2011.381.387

URL: https://scialert.net/abstract/?doi=jbs.2011.381.387

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Praveen Dahiya

Sharmishtha Purkayastha

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Research Article

**Isolation, Screening and Production of Extracellular Alkaline Lipase from a Newly Isolated Bacillus sp. PD-12**

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