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Chapter 21: Q15P (page 997)

What aldehyde is formed when valine is treated with ninhydrin?

Short Answer

Expert verified

The aldehyde formed is 2-methyl propanal.

Step by step solution

01

Step-by-Step SolutionStep 1:Structure of valine

The structure of valine is as follows:

Structure of valine

02

Aldehyde formed when valine is treated with ninhydrin

Valine is an aminoacid that forms coloured compounds when treated with ninhydrin.The possible mechanism to get the aldehyde is shown below:

Mechanism of the reaction

Ninhydrin treated with valine gives ninhydrin-amine and 2-methyl propanal as products.

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Most popular questions from this chapter

Write the mechanism for the reaction of a cysteine side chain with iodoacetic acid.

Which would have the greatest percentage of polar amino acids, a spherical protein, a cigar-shaped protein, or a subunit of a hexamer? b. Which would have the smallest percentage of polar amino acids?

A mixture of amino acids that do not separate sufficiently when a single technique is used can often be separated by two-dimensional chromatography.In this technique, the mixture of amino acids is applied to a piece of filter paper and separated by chromatographic techniques. The paper is then rotated90掳,and the amino acids are further separated by electrophoresis, producing a type of chromatogram called a fingerprint.Identify the spots in the fingerprint obtainedfrom a mixture of Ser, Glu, Leu, His, Met, and Thr.

Draw the predominant form for glutamate in a solution with the following pH:

a.0 b. 3 c. 6 d. 11

After the polypeptide shown below was treated with maleic anhydride, it was hydrolyzed by trypsin. (After a polypeptide is treated with maleic anhydride,

trypsin will cleave the polypeptide only on the C-side of arginine.)

Gly-Ala-Asp-Ala-Leu-Pro-Gly-Ile-Leu-Val-Arg-Asp-Val-Gly-Lys-Val-Glu-Val-Phe-Glu-Ala-Gly-

Arg-Ala-Glu-Phe-Lys-Glu-Pro-Arg-Leu-Val-Met-Lys-Val-Glu-Gly-Arg-Pro-Val-Gly-Ala-Gly-Leu-Trp

a. After a polypeptide is treated with maleic anhydride, why does trypsin no longer cleave it on the C-side of lysine?

b. How many fragments are obtained from the polypeptide?

c. In what order will the fragments be eluted from an anion-exchange column using a buffer of pH = 5?
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