پديد آورنده :
فريدوني، احسان
عنوان :
توليد صمغ زانتان از كاه برنج با استفاده از پيش فرآوري قليايي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
چهارده، 96ص.: مصور
استاد راهنما :
كيخسرو كريمي
استاد مشاور :
محمدهادي جزيني
توصيفگر ها :
زانتاموناس كمپستريس , هيدروليز
تاريخ نمايه سازي :
1394/09/07
استاد داور :
حميد زيلويي، پوراندخت گلكار
تاريخ ورود اطلاعات :
1396/10/05
رشته تحصيلي :
مهندسي شيمي
چكيده انگليسي :
Xanthan Gum Production from Rice Straw by Alkali Pretreatment Ehsan Frydouni E Frydouni@ce iut ac ir Date of Submission July 12 2015 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Keikhosro karimi karimi@cc iut ac irAbstract Xanthan gum is one of the most important commercial bio polymers that are used in many industries dueto its rheological properties The gum generally is produced by the Xanthomonas Campestris bacterium Using an inexpensive substrate to reduce production costs has been considered always in xanthan productionprocess In recent years due to an increase in environmental pollution whole attitudes are gone towardrenewable energy As appropriate structure of lignocellulosic biomasses they are one of the most importantresources to secure substrate for use in the renewable energy sector Components of lignocellulosic materialsinclude cellulose lignin and hemicellulose Lignocellulosic materials exist in agricultural wastes forests andmeadows Large quantities of these materials are burned annually Rice straw as a lignocellulosic materialdue to high silica contents is not useable and can t use as livestock feed therefore is burned by farmers andcauses environmental pollution On the other hand the most important nutrient in the production of xanthangum by Xanthomonas campestris microorganism is glucose that is supplied by sucrose and inverted sugar Therefore if the cellulose in rice straw is separated and converted to glucose the primary costs of substratewill reduce dramatically and will prevent the increase of environmental pollution In this study rice straw wasused as an abundant and inexpensive substrate in the microbial production of xanthan gum Initially the ricestraw was pretreated by 8 NaOH at temperatures of 0 and 100 C and at 0 30 60 90 120 and 150 minutes In another part of the project pretreatment was performed by sodium carbonate at temperatures of 120 150and 180 C and at concentrations of 0 25 0 5 and 1 M In the following the pretreated straw was hydrolyzedby cellulose and Beta Glucosidase enzymes with enzymatic activity of 45 FPU ml and 147 IU mlrespectively The amount of released glucose was measured by glucose kit The maximum amount ofreleased glucose in enzymatic hydrolysis by 8 NaOH pretreatment at 100 C and 120 minutes and bysodium carbonate pretreatment at 180 C and 0 5 M sodium carbonate were obtained 36 6 and 33 4 grams perliter respectively The biomass growth and production of xanthan charts were analyzed in order to producexanthan The results showed xanthan production yield from glucose was 47 5 The maximum amount ofxanthan were derived by 8 NaOH pretreatment equaled to 13 2 grams per liter at 100 C and 120 minutesand by 0 5M sodium carbonate pretreatment equaled to 12 grams per liter at 180 C Key words Pretreatment Xanthomonas Campestris xanthan gum rice straw hydrolysis
استاد راهنما :
كيخسرو كريمي
استاد مشاور :
محمدهادي جزيني
استاد داور :
حميد زيلويي، پوراندخت گلكار
