JEE Advanced · 2024 · 26 May 2024 · Paper 1 · Biomolecules

Aspartame, an artificial sweetener, is a dipeptide aspartyl phenylalanine methyl ester. The structure of aspartame is

(A)(see structure)
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

Aspartame is formed by condensation of aspartic acid (with a free carboxylic acid side chain) and the methyl ester of phenylalanine. The correct structure shows aspartic acid's amino group forming a peptide bond with the carboxyl of phenylalanine, whose own carboxyl is esterified as a methyl ester. The structure in option (B) correctly represents this dipeptide with the methyl ester at the C-terminus.

JEE Advanced · 2024 · 26 May 2024 · Paper 1 · Single correct option

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