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Isolation and Purification of β-galactosidase From New Born Goat Brain

استخلاص و تنقية إنزيم galactosidase – β المستخلص من دماغ الماعز حديثة الولادة

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 Publication date 2010
  fields Biology
and research's language is العربية
 Created by Shamra Editor




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β-galactosidase enzyme was isolated from the new born goat brain by nine methods, It was found that the sodium acetate 0.2 Mole/Liter +0.2Mole/Liter NaCl PH5 method have given the highest specific activity of crude enzyme in comparison with the other methods. Also, this enzyme was purified by using four methods, the second one (cold acetone) was the butter. As a result the purification fold was about 135.46 times and the yield about 77.14% by using Sephacryl S200 (second step). This enzyme is 187.437 KDa as a molecular weight.

References used
Abed, A. (2006). Isolation, Purification and Characterization of β-galactosidase From Local Chicken liver. Ph.D.thesis. University of Baghdad- Education College. Iraq
AL-Obaidy, H., 1975. Broad bean Lipoxygenase. M. Sc. Thesis, Food Sci. Dept. Agricultural college, Baghdad University
Al-Tamimi, S. (1996). The Enzymes Dissolving Proteins in Intact Grain, Abu Ghraib Variety, Infected with Sunna Insect and its Effect on Some Specific Characteristics. Ph.D. Thesis, College of Agriculture, Baghdad University
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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 method. The optimum pH for the enzyme activity is 5.5. The enzyme lost its activity completely at pH8.5, and showed great stability at the range of pH 4-6. The results indicated that the optimum temperature for the enzyme activity is 55Co at the optimum pH. The stability temperature for the enzyme is 35-60Co. The analytical results of 5%lactose solution hydrolyzed by the enzyme have indicated that the hydrolysis rate is between 40% after 60 minutes, to 95% after 270 minutes.
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.
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 croorganisms , plants and animal cells . Among these possibilities , microbial sources are the best.
The study included the selection of the best methods to extract the enzyme among nine methods. The protein content was concentrated and precipitated by cold acetone among other five methods of concentration (partial purification). The purification stages were achieved by using ion exchange column chromatography (DEAE – Sephadex A 50 column). Followed by gel filtration chromatography using sephacryl S-300. The active parts were lyophlizated (free drying) to obtain Lipoxygenase with 43.18% yield and 8.16 folds of purification and specific activity of 1162.9 unit / mg. The purity of enzyme was confirmed by poly acryl amide gel electrophoresis under non denaturing conditions, with the appearance a single band .
This study was carried out using white German goat race during 2000-2001 at the Research Center of Animal Production Division, Humboldt University, Berlin, in order to examine the validity of the Lactocorder instrument, which has been used for det ermination of milking curve of cows, to determine the milking curve of goat, and to study the timing changes of this curve.
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