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purple
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What is the chemical indicator used to test protein?
To test for protein. Biuret or solutions of sodium hydroxide and copper sulfate. Tested with a dropper a + result will be purple or something
Why does biuret reagent turn the skin brownish purple?
Biuret reagent react with the skin proteins.
What is the result when albumin solution pepsin and HCl are mixed with biuret reagent?
When albumin solution, pepsin, and HCl are mixed with biuret reagent, the resulting solution would likely turn purple due to the presence of proteins in the albumin solution. The biuret reagent reacts with peptide bonds in proteins, forming a purple complex. Pepsin is a protease enzyme that can break down proteins, potentially affecting the intensity of the purple color.
Does biuret's reagent turn lavender when heated?
No, biuret's reagent typically turns violet or pink when heated, not lavender. This color change is a characteristic reaction with proteins in which the copper ions in the reagent complex with peptide bonds, forming a colored complex.
What is formed when cuso4 n naoh are used for protein test?
When CuSO4 and NaOH are used for the protein test (Biuret test), the formation of a purple-colored complex indicates the presence of proteins. This color change occurs due to the interaction of the copper ions in CuSO4 with the peptide bonds in proteins, leading to the formation of a coordination complex that absorbs light in the visible range.
What is the chemical indicator used to test protein?
To test for protein. Biuret or solutions of sodium hydroxide and copper sulfate. Tested with a dropper a + result will be purple or something
What color will a peptide bond be after using the Biuret test?
in biuret test the presence of peptide bonds gives a violet color. but it should be noted that a minimum of two peptide bonds should be present in the protein to get a positive answer to this test.
If biuret reagent turns purple what substance is present?
Proteins are present when biuret reagent turns purple. Biuret reagent reacts with peptide bonds in proteins, causing the color change.
What does it mean when the protein test turn purple?
When a protein test turns purple, it typically indicates the presence of protein in the sample being tested. This color change is commonly associated with the Biuret test, where proteins react with copper ions in an alkaline solution, resulting in a purple complex. The intensity of the purple color can reflect the concentration of protein present. This test is often used in laboratories to assess protein levels in various biological samples.
What color does biuret reagent turn if lipid is present?
If lipids are present, the solution will turn a purple/violet color.
Why does biuret reagent turn the skin brownish purple?
Biuret reagent react with the skin proteins.
What is the result when albumin solution pepsin and HCl are mixed with biuret reagent?
When albumin solution, pepsin, and HCl are mixed with biuret reagent, the resulting solution would likely turn purple due to the presence of proteins in the albumin solution. The biuret reagent reacts with peptide bonds in proteins, forming a purple complex. Pepsin is a protease enzyme that can break down proteins, potentially affecting the intensity of the purple color.
What indicators are used for each molecule simple sugars starches lipids proteins?
Simple sugars: Benedict's solution test for reducing sugars. Starches: Iodine test, which turns blue-black in the presence of starch. Lipids: Sudan IV test, where lipids turn a red color. Proteins: Biuret test, leading to a color change from blue to purple in the presence of proteins.
Does biuret's reagent turn lavender when heated?
No, biuret's reagent typically turns violet or pink when heated, not lavender. This color change is a characteristic reaction with proteins in which the copper ions in the reagent complex with peptide bonds, forming a colored complex.
What color does distilled water turn with Benedict's reagent?
The water turns a pale blue. In other words stating that it doesnt contain protein
What is formed when cuso4 n naoh are used for protein test?
When CuSO4 and NaOH are used for the protein test (Biuret test), the formation of a purple-colored complex indicates the presence of proteins. This color change occurs due to the interaction of the copper ions in CuSO4 with the peptide bonds in proteins, leading to the formation of a coordination complex that absorbs light in the visible range.
What color does starch turn mixed with biuret reagent and why?
Starch does not react with Biuret reagent, which is primarily used to test for proteins. When Biuret reagent is added to a solution containing proteins, it turns a purple color due to the formation of a complex between copper ions in the reagent and peptide bonds in proteins. Therefore, if starch is present, it will not cause any color change with Biuret; the solution will remain blue, indicating the absence of proteins.
