Give the methods of biurete experiment.?
Answers: Effect of pH on Protein Solubility
Description: Casein dissolves in aqueous plinth. When acid is added to the solution slowly, the protein precipitates, but dissolves surrounded by excess acid. The process may be reversed by accumulation base to the sharp solution.
Biuret reagent
A biuret method has be developed which provides quantitative measurements of protein in regular urine without interference from drugs or pigments. This method is intended for use contained by monitoring clinical trials of new drugs—to detect nephrotoxicity. Protein is precipitated from duplicate sample of urine by addition of cold ethanolic phosphotungstic sour. The protein precipitates are separated by centrifugation and washed next to ethanol. Protein from one of the duplicate samples is dissolvel within biuret reagent. Protein from the second sample is dissolved contained by an alkaline tartrate reagent which is identical to the biuret reagent, excepting that copper sulfate have been omitted. After 20 min., the differential absorbance of the two sample is measured at 540 mu. The limit of sensitivity for detection of protein within urine is 0.5 mg./100 ml. The coefficient of variation of replicate analyses of protein surrounded by normal urine is 4.2%. The taking back of protein added to urine averages 103 ± 3%. Analyses of urinary protein by the biuret procedure provide close correlation with measurements by an amido black staining method.
Protein (biuret test). To more or less 2 cm^3 of test solution add on an equal volume of biuret solution, down the side of the test tube. A blue ring forms at the surface of the solution, which disappears on shaking, and the solution turns lilac-purple, indicating protein. The colour is due to a complex between nitrogen atoms within the peptide chain and Cu2+ ions, so this is really a exam for peptide bonds.
The medicine and robustness information post by website user , ByeDR.com not guarantee correctness , is for informational purposes only and is not a substitute for medical warning or treatment for any medical conditions.
Related Questions and Answers