Aspergillus niger and Saccharomyces cerevisiaet

نویسنده

  • MOHAMED M. ABOUZIED
چکیده

Direct fermentation of unhydrolyzed potato starch to ethanol by monocultures of an amylolytic fungus, Aspergilus niger, and cocultures ofA. niger and Saccharomyces cerevisiae was investigated. Amylolytic activity, rate and amount of starch utilization, and ethanol yields increased several-fold in coculture versus the monoculture due to the synergistic metabolic interactions between the species. Optimal ethanol yields were obtained in the pH range 5 to 6 and amylolytic activity was obtained in the pH range 5 to 8. Ethanol yields were maximal when fermentations were conducted anaerobically. Increasing S. cerevisiae inoculum in the coculture from 4 to 12% gave a dramatic increase in the rate of ethanol production, and ethanol yields of >96% of the theoretical maximum were obtained within 2 days of fermentation. These results indicate that simultaneous fermentation of starch to ethanol can be conducted efficiently by using cocultures of the amylolytic fungus A. niger and a nonamylolytic sugar fermenter, S. cerevisiae.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Bioethanol potentials of corn cob hydrolysed using cellulases of Aspergillus niger and Penicillium decumbens

Corn cob is a major component of agricultural and domestic waste in many parts of the world. It is composed mainly of cellulose which can be converted to energy in form of bioethanol as an efficient and effective means of waste management. Production of cellulolytic enzymes were induced in the fungi Aspergillus niger and Penicillium decumbens by growing them in mineral salt medium containing al...

متن کامل

Studies about expression of CbhB encoding gene from Aspergillus niger into Saccharomyces cerevisiae

Celullases are one of the most important industrial enzymes involved in lignocellulosic raw materials degradation for bioethanol production. In the enzymes cocktail, cellobiohydrolases are the key for the total hydrolysis processe. In this study, the ORF sequence of the type I cellobiohydrolase, CbhB fom the fungus Aspergillus niger was fused to the sequence of the glucoamilase Sta1 signal pept...

متن کامل

Production, Purification And Antimicrobial Activity Of Biosurfactants From Saccharomyces Cerevisiae And Pseudomonas Aeruginosa

Chemical surfactants are highly toxic to the environment so the Biosurfactants have paying attention by many scientists because of their low toxicity, biodegradability and ecological acceptability. The aim of this present study is to produce the Biosurfactants from Saccharomyces cerevisiae and Pseudomonas aeruginosa and to check its antimicrobial activity against several bacterial (Such as Esch...

متن کامل

اثر پروبیوتیکی مخمر ساکارومایسس سرویزیا (Saccharomyces cerevisiae) و آسپرژیلوس نایجر (Aspergillus niger) بر رشد و پاره‎ای از شاخص‎های ایمنی فیل ماهیان جوان (Huso huso) پرورشی

هدف از این تحقیق، ارزیابی اثرات پروبیوتیکی مخمر ساکارومایسس سرویزیا و آسپرژیلوس نایجر بر رشد و بازماندگی، نرخ ترشح آمونیاک، برخی از پارامترهای ایمنی و میکروبیوتای روده فیل ماهیان جوان (Huso huso) پرورشی بود. این پژوهش در قالب یک طرح کاملاً تصادفی با 4 تیمار و 3 تکرار انجام شد که شامل تغذیه فیل ماهیان جوان با جیره‎های غذایی حاوی 106×2، 106×4 و 106×6 سلول در گرم غذای پروبیوتیک و تیمار شاهد با جیره...

متن کامل

Production of high concentrations of ethanol from inulin by simultaneous saccharification and fermentation using Aspergillus niger and Saccharomyces cerevisiae.

Pure nonhydrolyzed inulin was directly converted to ethanol in a simultaneous saccharification and fermentation process. An inulinase-hyperproducing mutant, Aspergillus niger 817, was grown in a submerged culture at 30 degrees C for 5 days. The inulin-digestive liquid culture (150 ml) was supplemented with 45 g of inulin, 0.45 g of (NH4)2SO4, and 0.15 g of KH2PO4. The medium (pH 5.0) was inocul...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2003