Journal
BIOTECHNOLOGY & BIOTECHNOLOGICAL EQUIPMENT
Volume 27, Issue 3, Pages 3776-3781Publisher
TAYLOR & FRANCIS LTD
DOI: 10.5504/BBEQ.2012.0140
Keywords
lipase; Trichoderma harzianum; solid state fermentation (SSF); submerged fermentation (SmF); lipase characterization
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Funding
- DGEST through a project on lipase production from fungus as biodiesel catalyst [4321.11-P]
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The growing interest in lipase production is related to the potential biotechnological applications that these enzymes present. Current studies on lipase production by solid state fermentation involve the use of agro-industrial residues, aiming at increasing the economic attractiveness. Based on these aspects, the objective of this work was to investigate lipase production by a local strain Trichoderma harzianum in solid-state fermentation (SSF), using wheat bran as a solid substrate, and compare this lipase production with submerged fermentation (SmF) using a mineral culture medium. The maximum lipase activity, 1.82 U.mL(-1) +/- 0.01 U.mL(-1), was obtained during submerged fermentation in a medium containing 2% sucrose and 2% olive oil. However, 71.3 U.g(-1) +/- 1.48 U.g(-1) of dry solid substrate equivalent to 14.3 U.mL(-1) of lipase activity was reached using a solid-state fermentation process with a medium containing 0.75 % ammonium sulphate and 0.34 % urea, 2 % olive oil and wheat bran as a solid substrate. The pH and temperature optima for lipase were 8.03 and 40 degrees C, respectively. The Michaelis constant (K-M = 6.6 mmol.L-1) was obtained from two different plots, i.e. Lineweaver-Burk and Hanes-Woolf. V-max of the enzyme reaction was found to be 7.5 U.mL(-1).
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