The colour would change to a purple, dark purple colour.
One can test for protein in a sample by using a method called the Biuret test. This test involves adding a reagent to the sample, which causes a color change if protein is present. The intensity of the color change can indicate the amount of protein in the sample.
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A common chemical test for proteins is the Biuret test. This test involves adding a solution of copper sulfate and sodium hydroxide to the protein sample, resulting in a color change from blue to purple if proteins are present. The intensity of the purple color can provide an estimate of the protein concentration in the sample.
You can test the presence of protein in milk using the Biuret test. This test involves adding Biuret reagent to the milk sample, which reacts with proteins to give a purple color change. The intensity of the color change is proportional to the protein concentration in the milk sample.
A positive test for protein typically appears as a violet or purple color when using chemical indicators such as Biuret reagent. This color change indicates the presence of proteins in the test sample.
The indicator used to test for protein hydrolysis that results in a yellow color is phenol red. In an alkaline environment due to the release of ammonia from protein breakdown, phenol red changes from red to yellow, indicating a positive test for protein hydrolysis.
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changes color
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.
A positive test for protein typically shows a color change in a reagent used during the test. For instance, in a urine protein test, the presence of protein may cause the test strip to change color, indicating a concentration above normal levels. In laboratory settings, a positive result might also be quantified, showing specific levels of protein that can suggest conditions like kidney disease or infection. The exact appearance will depend on the specific test method employed.
SST separated tube
For protein electrophoresis, a clear or colorless test tube is typically used. This allows for easy visualization of the protein bands after electrophoresis is complete. Any other colored test tube could interfere with accurate observation and analysis of the results.