استُخدم 84 عزلة بكتيرية عزلت من عينات محلية مختلفة من تربة و فاكهة و خضار للكـشف عـن
إنتاج إنزيم البكتيناز باستخدام طريقة الوسط الـصلب method assay plate و قـد اسـتخدم بكتـين
الحمضيات كمصدر وحيد للكربون. أبدت 13 عزلة فقط (%5.15) القدرة على إنتـاج إنـزيم البكتينـاز،
اختير منها 4 عزلات كانت قطر الهالة المتشكلة حول مستعمراتها على الطبق الصلب أكبر مـن 3 سـم،
صنفت هذه العزلات الأربع فكانت جميعها من جنس Bacillus ،حدد نوعها باسـتخدام نظـام 50 API
CHB إذْ تبين أن ثلاثاً منها من نوع subtilis. B و واحدة من نوع cereus.B .اختيرت العزلـة التـي
أعطت أعلى فعالية على الطبق و كانـت subtilis Bacillus (العزلـة B30) . وصـف إنـزيم البـولي
غالاكتوروناز (PG) الذي تم الحصول عليه من هذه العزلة بدراسة الظروف المثلى لعمله. جرى الحصول
على أعلى فعالية له عند درجة الحرارة 52° م، و باهاء ( pH = (9 و استنتج أنه يمكن إنتـاج البـولي
غالاكتوروناز و توصيفه بعد تنقيته لاستخدامه في الصناعات ذات الظروف القلوية و يمكن استخدامه فـي
معالجة مخلفات مياه مصانع الأغذية الغنية بالبكتينات.
Eighty four bacterial strains, isolated from various local soils, vegetables
and fruits in decomposition were screened to detect pectinase using citrus
pectin as the sole carbon source according to solid plate assay.
Results showed that 13 strains showed ability to produce pectinase
depolymerization in assay plate as evidenced by clear hydrolization halos
formed around the colonies. Four strains among them presented considerable
pectinolytic activity since haloes with more than 3 cm in diameter were formed.
Based on morphological and chemical characteristics, 3 strains were classified
as Bacillus subtilis and 1 strain as Bacillus cereus. The Bacillus subtilis (B30)
strain which had the biggest halo and produced high activity of the enzyme was
incubated with polygalactuoronic acid under different conditions of
temperature and pH levels. This strain showed high activity to produce
polygalauoronase at 52°C and pH 9.0. It was concluded that there is an ability
to produce locally alkaline polygalactuoronase which can be used for
manufacturing purposes, especially for treatment the west products of food
processing units to remove pectins.
References used
Alkorta, I., C. Garbisu, M. J. Llama and J. L. Serra. 1998. Industrial applications of pectic enzymes: A review. Process Biochem., 33: 21-28
Babu, K. R. and T. Satyanarayana. 1995. N1-Amylase production by thermophilic Bacillus coagulans in solid state fermentation. Process Biochem., 30: 305-309
Bergey, D. H. and J.G. Holt. 2000. Bergey's manual of determinative bacteriology: Philadelphia, Lippincott Williams & Wilkins
يعد الميتانول و الإيتانول من أكثر المحلات شيوعاً، و بما أن درجة غليانها أقل من مئة
درجة مئوية فإنها تتطاير بشكل سريع. و على سبيل المثال، يستعمل الميتانول في تصنيع
الأصبغة و العقاقير و العطور.. و هو شديد السمية، لذلك من الضروري تطوير محسات لكشفه.
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Some characteristics of β-galactosidase enzyme that was isolated from a new
born goat brain were studied. This study concluded that the enzyme is glucoenzyme
in which the carbohydrate part constitutes 22.1% in accordance with
phenol –sulfate acid
B-D-Galactosidase (B-D- galactoside galactohydrolase , E. C. 3.2.1.23) , is one of the most important enzymes used in food processing . It a specific example of a glycosidase enzyme. Many organisms naturally synthesize B- galactosidase , including mi
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.
Nineteen locally selected potato lines were screened for water stress
tolerance by measuring the growth parameters in vitro. The stress was achieved
by adding 4% of sorbitol to the growth medium. Plant height and diameter,
leaf area, number, lengt