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Purification and partial characterization of a lipase from Bacillus coagulans ZJU318
Authors:Tang Lianghua  Xia Liming
Affiliation:(1) Department of Chemical Engineering and Bioengineering, Zhejiang University, 310027 Hangzhou, China;(2) College of Bioengineering, Fujian Normal University, 350007 Fuzhou, China
Abstract:
An extracellular lipase was purified from the fermentation broth of Bacillus coagulans ZJU318 by CM-Sepharose chromatography, followed by Sephacryl S-200 chromatography. The lipase was purified 14.7-fold with 18% recovery and a specific activity of 141.1 U/mg. The molecular weight of the homogeneous enzyme was (32 kDa), determined by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis. The enzyme activity was maximum at pH 9.0 and was stable over a pH range of 7.0–10.0, and the optimum temperature for the enzyme reaction was 45°C. Little activity loss (6.2%) was observed after 1 h of incubation at 40°C. However, the stability of the lipase decreased sharply at 50 and 60°C. The enzyme activity was strongly inhibited by Ag+ and Cu2+, whereas EDTA caused no inhibition. SDS, Brij 30, and Tween-80 inhibited lipase, whereas Triton X-100 did not significantly inhibit lipase activity.
Keywords:Lipase   Bacillus coagulans   purification  characterization  stability
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