To make homemade biuret reagent, mix together copper sulfate (0.1g), sodium hydroxide (0.3g), and potassium iodide (0.6g) with distilled water (100ml). Allow the mixture to dissolve completely. This solution can be used for testing the presence of proteins.
Biuret is named after the compound from which it is derived, biuret (also known as carbamyl urea). Biuret reagent reacts with proteins to form a complex that has a distinctive purple color, making it a useful tool for detecting the presence of proteins.
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Amino acids doesn't react with the biuret reagent.
Pepsin does not test positive in the biuret test. The biuret test is used to detect the presence of proteins in a solution, which contain peptide bonds. Pepsin is an enzyme that breaks down proteins into smaller peptides, so it does not give a positive result in the biuret test.
Not all amino acids react with the Biuret reagent. The Biuret test specifically detects the presence of peptide bonds, which are formed when amino acids link together in proteins. Therefore, free amino acids without peptide bonds do not produce a color change with the Biuret reagent. However, when amino acids are part of a polypeptide or protein, they will react positively with the Biuret test.
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Biuret is named after the compound from which it is derived, biuret (also known as carbamyl urea). Biuret reagent reacts with proteins to form a complex that has a distinctive purple color, making it a useful tool for detecting the presence of proteins.
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Biuret reagent detect peptide bonds.
The biuret solution used in the biuret test for peptide bonds is blue in the absence of peptide bonds or biuret which also results in a positive result. A positive result for peptide bonds or biuret is apparent as the biuret solution turns purple/violet in color.
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Amino acids doesn't react with the biuret reagent.
Proteins are present when biuret reagent turns purple. Biuret reagent reacts with peptide bonds in proteins, causing the color change.