Domanda del libro di testo
Draw the structure of the predominant form of
(e) a mixture of alanine, lysine, and aspartic acid at (iii) pH 2.
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Ch. 24 - Amino Acids, Peptides, and Proteins
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Capitolo 24, Problema 4b
Draw the structure of the predominant form of
(b) proline at pH 2.
Guida verificata passo dopo passo1
Step 1: Understand the structure of proline. Proline is an amino acid with a unique cyclic structure where the amino group is part of a five-membered ring. Its chemical formula is C5H9NO2, and it contains both an amino group (-NH2) and a carboxylic acid group (-COOH).
Step 2: Recall the behavior of amino acids at low pH. At pH 2, the environment is highly acidic, meaning there is an abundance of H⁺ ions. This causes the amino group to become protonated (-NH3⁺) and the carboxylic acid group to remain in its protonated form (-COOH).
Step 3: Identify the predominant form of proline at pH 2. Since the amino group is protonated and the carboxylic acid group is not deprotonated, the structure will include both -NH3⁺ and -COOH groups.
Step 4: Draw the structure of proline with the correct protonation states. Represent the cyclic structure with the amino group as -NH3⁺ and the carboxylic acid group as -COOH. Ensure the side chain and ring are accurately depicted.
Step 5: Verify the structure. Double-check that the protonation states match the conditions at pH 2 and that the cyclic structure of proline is correctly represented.
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Amino Acid Structure
Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has a central carbon atom bonded to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a variable side chain (R group). Proline is unique among amino acids due to its cyclic structure, where the side chain forms a ring with the amino group, affecting its properties and behavior in proteins.
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7:19
Charged Amino Acids
pH and Protonation
pH is a measure of the acidity or basicity of a solution, influencing the protonation state of functional groups in molecules. At low pH (acidic conditions), amino groups can be protonated to form -NH3+, while carboxyl groups can remain in their protonated form (-COOH). Understanding how pH affects the ionization of amino acids is crucial for predicting their predominant forms in different environments.
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01:46Why we use pKa instead of pH.
Zwitterion Formation
A zwitterion is a molecule that has both positive and negative charges, resulting in an overall neutral charge. In the case of proline at physiological pH, it exists predominantly as a zwitterion, where the amino group is protonated (-NH3+) and the carboxyl group is deprotonated (-COO-). This dual charge state is important for the solubility and reactivity of amino acids in biological systems.
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04:41Why Amino Acids Exist as Zwitterions
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