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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

a.Which amino acid has the lowest pI value?

b.Which amino acid has the highest pI value?

c.Which amino acid has the greatest amount of negative charge at pH = 6.20?

d.Which amino acid has a greater negative charge at pH = 6.20, glycine or methionine?

alpha- Amino acids can be prepared by treating an aldehyde with ammonia/trace acid, followed by hydrogen cyanide, followed by acid-catalyzed hydrolysis.

a. Draw the structures of the two intermediates formed in this reaction.

b. What amino acid is formed when the aldehyde that is used is 3-methylbutanal?

c. What aldehyde is needed to prepare isoleucine?

Reaction of a polypeptide with carboxypeptidase A releases Met. The polypeptide undergoes partial hydrolysis to give the following peptides.

What is the sequence of the polypeptide?

1. Ser, Lys, Trp4. Leu, Glu, Ser 7. Glu, His 10. Glu, His, Val

2. Gly, His, Ala 5. Met, Ala, Gly8. Leu, Lys, Trp11. Trp, Leu, Glu

3. Glu, Val, Ser 6. Ser, Lys, Val 9. Lys, Ser 12. Ala, Met

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

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

Show the steps in the synthesis of the tetrapeptide Leu- Phe- Ala- Val
See all solutions

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