Abstract
A haloalkaliphilic solvent-tolerant lipase was produced from Alkalibacillus salilacus within 48 h of growth in liquid medium. An overall 4.9-fold enhanced production was achieved over unoptimized media after medium optimization by statistical approaches. Plackett–Burman screening suggested lipase production maximally influenced by olive oil, KH2PO4, NaCl, and glucose; and response surface methodology predicted the appropriate levels of each parameter. Produced lipase was highly active and stable over broad ranges of temperature (15–65 °C), pH (4.0–11.0), and NaCl concentration (0–30 %) showing excellent thermostable, pH-stable, and halophilic properties. The enzyme was optimally active at pH 8.0 and 40 °C. Majority of cations, except some like Co2+ and Al3+ were positive signals for lipase activity. In addition, the presence of chemical agents and organic solvents with different log P ow was well tolerated by the enzyme. Finally, efficacy of lipase-mediated esterification of various alcohols with oleic acid in organic solvents was studied.
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Acknowledgments
This work was supported financially by the Grant No. 93-01-90-25247 from Tehran University of Medical Sciences, Tehran, Iran to M.A.F.
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Communicated by A. Driessen.
M. R. Khoshayand is the correspondence for the section of statistical experimental design.
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Samaei-Nouroozi, A., Rezaei, S., Khoshnevis, N. et al. Medium-based optimization of an organic solvent-tolerant extracellular lipase from the isolated halophilic Alkalibacillus salilacus . Extremophiles 19, 933–947 (2015). https://doi.org/10.1007/s00792-015-0769-7
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DOI: https://doi.org/10.1007/s00792-015-0769-7