no!
no change in colour confirms presence of cysteine
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Yes, cysteine would test positive in a biuret test. This is because cysteine, like other amino acids, contains peptide bonds that react with the copper ions in the biuret reagent to form a purple color complex.
No, phenol does not give a positive biuret test. The biuret test is used to detect the presence of proteins, not phenol. Phenol is a type of organic compound that does not contain the peptide bonds that the biuret test reacts with.
Yes, albumin would typically give a positive biuret test. The biuret test detects proteins by forming a violet color complex in the presence of peptide bonds, which are found in proteins like albumin.
No, glucose would not give a positive result with the Biuret test. The Biuret test is specific for detecting proteins, not sugars like glucose. It works by reacting with peptide bonds in proteins to form a colored complex.
Nitroprusside test detects the presence of cysteine and cystine amino acids. These amino acids react with nitroprusside to form a purple color complex, indicating a positive test for cysteine or cystine.
If both Biuret and Millon's tests give a positive result, it suggests the presence of proteins in the sample. Biuret test is specifically for proteins containing peptide bonds, while Millon's test is used for identifying proteins with tyrosine residues. The positive results from both tests provide strong evidence for the presence of proteins in the sample.