کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2963 145 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Three-phasic fermentation systems for enzyme production with sugarcane bagasse in stirred tank bioreactors: Effects of operational variables and cultivation method
ترجمه فارسی عنوان
سیستم های تخمیر سه فاز برای تولید آنزیم با باگاس نیشکر در بیوراکتورهای مخزن مخلوط: اثر متغیرهای عملیاتی و روش کشت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
چکیده انگلیسی


• 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical Engineering Journal - Volume 97, 15 May 2015, Pages 32–39
نویسندگان
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