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http://dx.doi.org/10.5352/JLS.2013.23.1.110

Culture Conditions for Improving Extracellular Lipolytic Enzyme Production by a Novel Thermophilic Geobacillus sp. AR1  

Park, Su-Jin (Department of Biotechnology & Bioengineering, Dong-Eui University)
Jeon, Sung-Jong (Department of Biotechnology & Bioengineering, Dong-Eui University)
Publication Information
Journal of Life Science / v.23, no.1, 2013 , pp. 110-115 More about this Journal
Abstract
A microorganism (strain AR1) producing an extracellular lipolytic enzyme was isolated from hot springs located in Beppu, Japan. Phylogenetic analysis based on the 16S rDNA sequence and biochemical studies indicated that AR1 belongs to the genus Geobacillus. This study focused on novel strategies to increase extracellular lipolytic enzyme production by this novel Geobacillus sp. AR1. Cultures of the AR1 strain grew within a wide temperature range (from 35 to $75^{\circ}C$); the optimum temperature was $65^{\circ}C$. The pH for optimal growth was 6.5, whereas the optimum pH for lipolytic enzyme production was 8.5. The presence of oils in the culture medium led to improvements in lipolytic enzyme activity. Soybean oil was the most efficient inducer, and it yielded better results when added in the exponential phase. On the other hand, the addition of chemical surfactants led to lipolytic enzyme production. Their addition to the culture could affect the location of the enzyme activity. The addition of Tween 20 in the stationary phase significantly increased the proportion of the extracellular enzyme activity. According to the results, following the addition of soybean oil and Tween 20 in the exponential and stationary phases, the extracellular lipolytic activity was increased 2.4-fold compared with that of a control.
Keywords
Geobacillus; lipolytic enzyme; oil; surfactant;
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