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Extracellular solvent stable cold-active lipase from psychrotrophic Bacillus sphaericus MTCC 7526: partial purification and characterization

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Abstract

Psychrotropic Bacillus sphaericus producing solvent stable cold-active lipase upon growth at low temperature was isolated from Gangotri glacier. Optimal parameters for lipase production were investigated and the strain was able to produce lipase even at 15 °C. An incubation period of 48 h and pH 8 was found to be conducive for cold-active lipase production. The addition of trybutyrin as substrate and lactose as additional carbon source increased lipase production. The enzyme was purified up to 17.74-fold by ammonium sulphate precipitation followed by DEAE cellulose column chromatography. The optimum temperature and pH for lipase activity were found to be 15 °C and 8.0, respectively. The lipase was found to be stable in the temperature range 20–30 °C and the pH range 6.0–9.0. The protein retained more than 83 % of its initial activity after exposure to organic solvents. The lipase exhibited significant stability in presence of acetone and DMSO retaining >90 % activity. The enzyme activity was inhibited by 10 mM CuSO4 and EDTA but showed no loss in activity after incubation with other metals or inhibitors examined in this study.

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Acknowledgement

The authors are grateful to Department of Biotechnology Govt. of India for the grant (BT/PR2639/PID/24/112/2001) received to carry out this study.

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Correspondence to Babu Joseph.

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Joseph, B., Ramteke, P.W. Extracellular solvent stable cold-active lipase from psychrotrophic Bacillus sphaericus MTCC 7526: partial purification and characterization. Ann Microbiol 63, 363–370 (2013). https://doi.org/10.1007/s13213-012-0483-y

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  • DOI: https://doi.org/10.1007/s13213-012-0483-y

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