Lease me loves. a sample of white powder is given to you to identify. you may use the the benedict test, the lugol test, the biuret test, and the sudan red test to identify it. 1.what will each test tell you? 2.if the white powder was an starch, how would each of the tests turn out? ,
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Ответ:
Lugol test is a test using iodine to check for the presence of starch. If starch is present, a deep blue-black color will appear.
Biuret test is a test for the presence of peptide bonds which is found in proteins. If peptide bonds are present the solution will turn violet with the intensity of the color being proportional to the concentration of peptide bonds.
Sudan Red test is a test for the presence of lipids (fat). If present, the fats will be stained reddish-orange.
2. Since the white powder is a starch, we will get the following:
Benedict test - Clear to light blue. Little to no reaction.
Lugol test - deep blue-black color will appear. Positive reaction.
Biuret test - remains blue in color, no reaction.
Sudan Red test - No red-orange color will appear.
Ответ:
So true