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Register a new userOptimization of Cellulase Enzyme Production Conditions from Bacillus cereus 21 Using Submerged Fermentation
أمثلة ظروف إنتاج أنزيم السيلولاز من بكتريا Bacillus cereus 21 باستخدام طريقة التخمير المغمور
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Damascus University ورقة بحثية
Publication date
2013
fields
Food Sciences
and research's language is
العربية
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Shamra Editor
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جرت أمثلة ظروف إنتاج أنزيم السيلولاز باستخدام قشور الذرة كركيزة و السلالة المحلية Bacillus cereus 21 المنتجة للأنزيم وفق طريقة التخمير المغمور، و درس فيها تأثير خمسة متغيرات (درجة حرارة الحضن، و درجة الحموضة، و مدة الحضن، و حجم اللقاحة، و تركيز الركيزة) في نمو السلالة المستخدمة و إنتاج الأنزيم، و ذلك باستخدام البرنامج الإحصائي Minitab و التصميم الإحصائي Response Surfac e Methodology (RSM).
The conditions for producing cellulase enzyme were optimized using corn husks as substrate in submerged fermentation. The effects of five parameters (incubation temperature, pH, substrate concentration, inoculum volume, fermentation time) on the strain growth and enzyme production were studied. For this purpose the statistical program Minitab and the statistical design Response Surface Methodology (RSM) were applied.
References used
Abou-Taleb, K. A., W. A. Mashhoor, A. Sohair, M.S. Sharaf, and H. M. Hoda. 2009. Nutritional and Environmental Factors Affecting Cellulase Production by Two Strains of Cellulolytic Bacilli, Australian Journal of Basic and Applied Sciences 3(3): 2429-2436
Bailey, M. J. and K. M. H. Nevalainen. 1981. Induction, isolation and testing of stable Trichoderma reesei mutants, Enzyme Microb. Technology 3: 153-157
Buchert J., Suurnakki A., Tenkanen M. and Viikari L. 1996. Enzymatic characterization of pulps, in enzymes for pulp and paper processing, Edited by T. W. Jeffries, L Viikari, ACS Symp Ser 655. 38-43
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In the framework of this research, bacteria belonging to the genus Bacillus were isolated from some Syrian soils in the governorate of Damascus and its countryside, and the governorates of Daraa and Quneitra. Some morphological, agricultural and bioc
hemical traits of the colonies were studied and the isolates producing cellulase enzyme were selected. The average diameters of the halos of the produced isolates ranged between 1 and 3.6 cm and the analysis efficiency ranged between 1.1 and 4, 20 out of 65 isolates producing the enzyme were classified using the (API 50 CH) system. DNA using a modified reference method.
45 samples were collected from various sources (soil, degraded wood and
mushroom compost) from three cities (Damascus, Homs and Lattakia). 18
Trichoderma isolates were isolated and identified by microscope. These isolates
were screened using CMC m
edium with Congo red dy to identify their ability
to produce cellulase complex. The amount of enzyme production was
determined depending on the radius of clear zone around the colony. Results
showed that the most productive isolate was Tr with radius 7 ± 0.2 cm followed
by Tg and Ti. Optimization of cellulase production was performed using
response surface methodology (RSM). The optimal parameters were:
temperature 29.5 ˚C, pH = 6، incubation time 4 days, aeration speed 175 rpm
and wheat straw concentration 3%. All studied parameters had significant
effect on cellulase enzyme activity.
The study was conducted in 2016. The samples of rice Oryza sativa L. straw
were collected from Dewania governorate/Iraq, and were brought to laboratory of
Directorate of Environmental and Water in Ministry of Science and Technology.
The samples we
re cleaned and milled, then stored in sterile containers. Local
cellulolytic bacterial isolate was cultivated and isolated on mineral and cellulose
medium, at 37 ºC for (24± 2) hours, the bacterial isolate was diagnosed as Bacillus sp.
depending on phenotypes of bacterial colonies on solid medium, microscopic
characters and some biochemical tests. Milled rice straw was chemically treated
with 1% of sodium hydroxide, then biological treatment by bacterial isolate Bacillus sp
cultivate in mineral medium with alkali treated rice straw as carbone source and
compared with cellulose standard medium. The bacterial growth was measured at
600 nm, which reached 0.974 in rice straw medium, while in cellulose medium
reached 0.853. For glucose concentration, the value reached 250 μg/ml in rice straw
medium, while in cellulose medium it was 210 μg/ml. The results concluded the
possibility of getting rid of rice husks, which is an environmental contaminant, and
to use it in the production of glucose.
40 samples were collected from milk from Homs to isolate the
bacteria and study their ability to produce the enzyme β-
galactosidase and diagnose isolates the most efficient in the
production of the enzyme, the results showed the presence of 25
sporeforming isolates producing the enzyme β-galactosidase , the
effectiveness of β-galactosidase was estimated using
spectrophotometer at a wavelength of 420 nm.
Producing of biofuel from crops wastes is considered one of the
advanced eco- friendly technologies. This research was conducted
in the General Commission For Biotechnology in order to study the
possibility to use the juice of sugar sorghum plant
as alternative
substrate to produce bioethanol using S. cerevisiae and optimize
the production’ conditions.
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