IdentificationTest for Albumin: Biochemistry Practical, Lab Manual
BP209P Biochemistry Practical / B Pharmacy Syllabus and Notes
S.NO. | EXPERIMENT | OBSERVATION | INFERENCE |
1 | XANTHOPROTEIN TEST: To 3ml of protein solution add 1ml conc. nitric acid boil for about half a minute. Cool and observe the yellow colour. Now, add 2ml of conc. ammonia or 40% sodium hydroxide and observe the change in colour after the addition of alkali. | yellow colour is appears | Presence of aromatic amino acid. |
2 | MILLON’S TEST: To 1ml of protein solution add 1ml of 10% mercuric nitrate (prepared in 10% sulphuric acid). Boil gently for half a minute. Cool and add 3 drops of 1% solution of sodium nitrate. Mix and observe. | The red colour precipitate is obtained | Presence of tyrosine in a solution |
3 | SULPHUR TEST: To 3ml of protein solution add an equal volume of 40% sodium hydroxide and boil for 3 minutes. Cool and then add 1ml of lead acetate solution. | No dark grey or black precipitate is obtained. | Absence of sulphur-containing amino acid cysteine and cystine. Methionine does not answer this test due to the presence of thioether linkage which does not allow the release of sulphur in this reaction. |
4 | HELLER’S TEST: Take 3ml of con. nitric acid and add 2ml of urine along the sides of the test tube. | A white ring of meta proteins appears at the junction of the fluids. | Presence of proteins like albumin & globulins. |
5 | PRECIPITATION BY NEUTRAL SALT: HALF SATURATION: Take 3ml of protein solution in a test tube; add an equal volume of saturated ammonium sulphate solution to it, mixed and allowed to stand. FULL SATURATION: Take 3ml of protein solution, add ammonium sulphate salt to it and keep on adding and at the same time mix till protein solution become saturated. | No white precipitate is formed. White precipitate is formed. | Absence of Globulin, Casein. Presence of Albumin |
REPORT:
The given sample was found to be Albumin.
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Suggested readings:
BP209P Biochemistry Practical, Lab Manual, PDF, Journal, Book, D Pharm B Pharmacy Syllabus and Notes