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An extracellular lipase produced by marine fish intestinal isolate Halobacillus sp. AP-MSU 8 was purified and characterized. The lipase was purified to homogeneity using ammonium sulphate precipitation, DEAE-Sepharose anion exchange chromatography and Sephadex G-75 gel filtration chromatography. The overall purification protocols resulted in 25 % yield of lipase with 10.6-fold. The SDS-PAGE (12 %) analysis of purified lipase resulted in the molecular mass of the purified lipase as 25-kDa. The optimum pH and temperature required for maximum activity of purified lipase was 9.0 and 40 °C respectively. Also, this lipase is halo tolerant and requires 2.5 M NaCl for maximum activity. The activity of the purified lipase was more in the presence of BaCl2 and MgSO4, and in contrast the enzyme activity was totally inhibited in the presence of ZnSO4 and ZnCl2. The surfactants such as polyethylene glycol and Tween 20 enhanced the lipase activity. Likewise 10 % concentration of organic solvents such as benzene and acetone stimulated the lipase activity, whereas at 20 % concentration all the tested solvents inhibited the lipase activity.
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences – Springer Journals
Published: Nov 5, 2014
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