d) Ninhydrin is used to turn amino acids in fingerprints purple, make a good way to stain fingerprints. The reaction of ninhydrin with amino acids is different for proline than the other amino acids. For 19 amino acids including glycine, it takes two ninhydrin molecules to react with the amino acid to produce the purple pigment products. For proline, only one ninhydrin molecule reacts and the color of the product is not normally purple. a. What about the structure of proline causes it to react differently? b. Write mass balance equations for the reaction of glycine with ninhydrin (using [Glycine] total) and for the reaction of proline with ninhydrin (using [Proline] total). c. Now write the mass balance equation for each of the two reactions using [Ninhydrin]total. (Note: The mass balance reaction is different for the two reactions.)

Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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Ninhydrin is used to turn amino acids in fingerprints purple, make a good way to stain fingerprints. The reaction of ninhydrin with amino acids is different for proline than the other amino acids. For 19 amino acids including glycine, it takes two ninhydrin molecules to react with the amino acid to produce the purple pigment products. For proline, only one ninhydrin molecule reacts and the color of the product is not normally purple.
 
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d) Ninhydrin is used to turn amino acids in fingerprints purple, make a good way to
stain fingerprints. The reaction of ninhydrin with amino acids is different for proline
than the other amino acids. For 19 amino acids including glycine, it takes two
ninhydrin molecules to react with the amino acid to produce the purple pigment
products. For proline, only one ninhydrin molecule reacts and the color of the
product is not normally purple.
a. What about the structure of proline causes it to react differently?
b. Write mass balance equations for the reaction of glycine with ninhydrin
(using [Glycine]total) and for the reaction of proline with ninhydrin (using
[Proline]total).
c. Now write the mass balance equation for each of the two reactions using
[Ninhydrin]total (Note: The mass balance reaction is different for the two
reactions.)
Transcribed Image Text:d) Ninhydrin is used to turn amino acids in fingerprints purple, make a good way to stain fingerprints. The reaction of ninhydrin with amino acids is different for proline than the other amino acids. For 19 amino acids including glycine, it takes two ninhydrin molecules to react with the amino acid to produce the purple pigment products. For proline, only one ninhydrin molecule reacts and the color of the product is not normally purple. a. What about the structure of proline causes it to react differently? b. Write mass balance equations for the reaction of glycine with ninhydrin (using [Glycine]total) and for the reaction of proline with ninhydrin (using [Proline]total). c. Now write the mass balance equation for each of the two reactions using [Ninhydrin]total (Note: The mass balance reaction is different for the two reactions.)
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