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Three-phasic fermentation systems for enzyme production with sugarcane bagasse in stirred tank bioreactors: Effects of operational variables and cultivation method

Paper ID Volume ID Publish Year Pages File Format Full-Text
2963 145 2015 8 PDF Available
Title
Three-phasic fermentation systems for enzyme production with sugarcane bagasse in stirred tank bioreactors: Effects of operational variables and cultivation method
Abstract

•Operational variables strongly affect the three-phasic stirred tank bioreactor cultivations.•Endoglucanase and xylanase production can be increased in around 3.2 and 7.5-fold.•There is a combined effect of agitation speed and substrate type on enzyme production.•A sequential fermentation method improves cellulolytic enzymes production.•Smaller particles of pretreated bagasse benefit enzyme production in bioreactors.

The high cost of enzymes is one of the main bottlenecks affecting the industrial production of cellulosic ethanol, which therefore requires the development of improved bioprocesses for the manufacture of cellulases. The present work concerns the selection of operating parameters for enzyme production in three-phasic bioreactors, using sugarcane bagasse as substrate. The parameters considered included cultivation method, substrate particle size and pretreatment, agitation speed, and pH. For both shake flask and stirred tank bioreactor (STB), a new sequential cultivation method employing steam explosion pretreated sugarcane bagasse significantly improved enzyme production, compared to conventional submerged fermentation. Larger substrate particle size provided a better support for fungal growth in shake flasks, while smaller particles resulted in greater homogeneity in stirred tank bioreactors. Maximum endoglucanase and xylanase production in the STB were 1599 ± 66 and 4212 ± 133 IU L−1, respectively, under sequential cultivation using pretreated bagasse particles smaller than 0.5 mm, agitation speed of 700 rpm, and pH 5.0. The findings provide useful information concerning the influence of operational variables on (hemi) cellulases production in STB three-phasic cultivations, which should contribute to the development of bioprocesses using lignocellulosic materials in large-scale bioreactors.

Keywords
Enzyme production; Cellulase; Filamentous fungi; Submerged culture; Xylanase; Sugarcane bagasse
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Three-phasic fermentation systems for enzyme production with sugarcane bagasse in stirred tank bioreactors: Effects of operational variables and cultivation method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 97, 15 May 2015, Pages 32–39
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us