Organic Chemistry
Organic Chemistry
4th Edition
ISBN: 9780073402772
Author: Janice G. Smith
Publisher: MCG
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Chapter 29, Problem 29.37P

What is the predominant form of each of the following amino acids at pH = 1 ? What is the overall charge on the amino acid at this pH ? (a) threonine; (b) methionine; (c) aspartic acid; (d) arginine

Expert Solution
Check Mark
Interpretation Introduction

(a)

Interpretation: The predominant form of threonine at pH=1 and the overall charge on it at this pH is to be predicted.

Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. The overall charge on an amino acid at isoelectric point is 0.

Answer to Problem 29.37P

The predominant form of threonine at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  1

The overall charge on it is +1.

Explanation of Solution

At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. However, when the pH of solution goes below isoelectric point, the amine group and carboxyl group exists as N+H3 and COOH, respectively.

The isoelectric point of threonine is 5.60. Therefore, the predominant form of threonine at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  2

Figure 1

The overall charge on threonine at pH=1 is +1.

Conclusion

The predominant form of threonine at pH=1 is shown in Figure 1 and the overall charge on it is +1.

Expert Solution
Check Mark
Interpretation Introduction

(b)

Interpretation: The predominant form of methionine at pH=1 and the overall charge on it at this pH is to be predicted.

Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. The overall charge on an amino acid at isoelectric point is 0.

Answer to Problem 29.37P

The predominant form of methionine at pH=1 is

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  3

The overall charge on it is +1.

Explanation of Solution

At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. However, when the pH of solution goes below isoelectric point, the amine group and carboxyl group exists as N+H3 and COOH, respectively.

The isoelectric point of methionine is 5.74. Therefore, the predominant form of methionine at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  4

Figure 2

The overall charge on methionine at pH=1 is +1.

Conclusion

The predominant form of methionine at pH=1 is shown in Figure 2 and the overall charge on it is +1.

Expert Solution
Check Mark
Interpretation Introduction

(c)

Interpretation: The predominant form of aspartic acid at pH=1 and the overall charge on it at this pH is to be predicted.

Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. The overall charge on an amino acid at isoelectric point is 0.

Answer to Problem 29.37P

The predominant form of aspartic acid at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  5

The overall charge on it is +1.

Explanation of Solution

At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. However, when the pH of solution goes below isoelectric point, the amine group and carboxyl group exists as N+H3 and COOH, respectively.

The isoelectric point of aspartic acid is 2.98. Therefore, the predominant form of aspartic acid at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  6

Figure 3

The overall charge on aspartic acid at pH=1 is +1.

Conclusion

The predominant form of aspartic acid at pH=1 is shown in Figure 3 and the overall charge on it is +1.

Expert Solution
Check Mark
Interpretation Introduction

(d)

Interpretation: The predominant form of arginine at pH=1 and the overall charge on it at this pH is to be predicted.

Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. The overall charge on an amino acid at isoelectric point is 0.

Answer to Problem 29.37P

The predominant form of arginine at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  7

The overall charge on it is +3.

Explanation of Solution

At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as N+H3 and carboxyl groups as COO. However, when the pH of solution goes below isoelectric point, the amine group and carboxyl group exists as N+H3 and COOH, respectively.

The isoelectric point of arginine is 10.76. Therefore, the predominant form of arginine at pH=1 is,

Organic Chemistry, Chapter 29, Problem 29.37P , additional homework tip  8

Figure 4

The overall charge on arginine at pH=1 is +3.

Conclusion

The predominant form of arginine at pH=1 is shown in Figure 4 and the overall charge on it is +3.

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Chapter 29 Solutions

Organic Chemistry

Ch. 29 - Prob. 29.11PCh. 29 - Problem 29.13 What alkene is needed to synthesize...Ch. 29 - Problem 29.14 Draw the structure of each peptide....Ch. 29 - Name each peptide using both the one-letter and...Ch. 29 - Prob. 29.15PCh. 29 - Prob. 29.16PCh. 29 - Problem 29.18 Glutathione, a powerful antioxidant...Ch. 29 - Problem 29.19 Draw the structure of the...Ch. 29 - Problem 29.20 Give the amino acid sequence of an...Ch. 29 - a What products are formed when each peptide is...Ch. 29 - Prob. 29.21PCh. 29 - Devise a synthesis of each peptide from amino acid...Ch. 29 - Devise a synthesis of the following dipeptide from...Ch. 29 - Prob. 29.24PCh. 29 - Consider two molecules of a tetrapeptide composed...Ch. 29 - What types of stabilizing interactions exist...Ch. 29 - Prob. 29.27PCh. 29 - Draw the product formed when the following amino...Ch. 29 - With reference to the following peptide: a...Ch. 29 - Devise a synthesis of the following dipeptide from...Ch. 29 - Prob. 29.31PCh. 29 - Prob. 29.32PCh. 29 - Histidine is classified as a basic amino acid...Ch. 29 - Tryptophan is not classified as a basic amino acid...Ch. 29 - What is the structure of each amino acid at its...Ch. 29 - To calculate the isoelectric point of amino acids...Ch. 29 - What is the predominant form of each of the...Ch. 29 - 29.37 What is the predominant form of each of the...Ch. 29 - a. Draw the structure of the tripeptide A–A–A, and...Ch. 29 - Draw the organic product formed when the amino...Ch. 29 - 29.39 Draw the organic products formed in each...Ch. 29 - 29.40 What alkyl halide is needed to synthesize...Ch. 29 - 29.41 Devise a synthesis of threonine from diethyl...Ch. 29 - 29.42 Devise a synthesis of each amino acid from...Ch. 29 - Prob. 29.45PCh. 29 - Prob. 29.46PCh. 29 - Prob. 29.47PCh. 29 - Prob. 29.48PCh. 29 - Prob. 29.49PCh. 29 - 29.48 Brucine is a poisonous alkaloid obtained...Ch. 29 - Prob. 29.51PCh. 29 - Prob. 29.52PCh. 29 - Draw the structure for each peptide: (a) Phe–Ala;...Ch. 29 - 29.52 For the tetrapeptide Asp–Arg–Val–Tyr: a....Ch. 29 - Prob. 29.55PCh. 29 - Explain why a peptide CN bond is stronger than an...Ch. 29 - Prob. 29.57PCh. 29 - 29.55 Draw the amino acids and peptide fragments...Ch. 29 - Prob. 29.59PCh. 29 - Prob. 29.60PCh. 29 - Prob. 29.61PCh. 29 - 29.59 An octapeptide contains the following amino...Ch. 29 - Prob. 29.63PCh. 29 - Prob. 29.64PCh. 29 - Draw all the steps in the synthesis of each...Ch. 29 - 29.62 Write out the steps for the synthesis of...Ch. 29 - 29.64 Another method to form a peptide bond...Ch. 29 - Prob. 29.68PCh. 29 - Prob. 29.69PCh. 29 - Which of the following amino acids are typically...Ch. 29 - After the peptide chain of collagen has been...Ch. 29 - Prob. 29.72PCh. 29 - Prob. 29.73PCh. 29 - 29.70 The anti-obesity drug orlistat works by...Ch. 29 - Prob. 29.75P
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