Question

An example for heterocyclic biogenic amine is __________.

• A. Tryptamine
• B. Spermine
• C. Phenylethylamine
• D. Cadaverine

Hint:

Remember: Biogenic amines containing nitrogen-heterocycles in their rings are heterocyclic (e.g., Tryptamine with an indole ring, Histamine with an imidazole ring).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Biogenic amines are basic nitrogenous compounds formed primarily by the decarboxylation of amino acids by bacterial enzymes in foods during storage, aging, or spoilage.
They are chemically classified into aliphatic, aromatic, or heterocyclic amines based on their molecular structures.

Step 2: Detailed Explanation:
Let us analyze the chemical structure and classification of each biogenic amine listed:
1. Tryptamine (A): Formed by the decarboxylation of the amino acid tryptophan. It contains an indole ring system (which consists of a benzene ring fused to a nitrogen-containing pyrrole ring). Because this indole ring system contains a heteroatom (nitrogen) within its cyclic structure, tryptamine is classified as a heterocyclic biogenic amine. Thus, (A) is correct.
2. Cadaverine (D) & Spermine (B): These are straight-chain hydrocarbons containing multiple amino groups. They lack any ring structures and are classified as aliphatic biogenic amines.
3. Phenylethylamine (C) (typo: "Phenylethylamne" in the paper): Formed from phenylalanine. It contains a benzene ring (carbocyclic, containing only carbon atoms in the ring) attached to an ethylamine chain. It is classified as an aromatic biogenic amine.

Step 3: Final Answer:
Therefore, Tryptamine is an example of a heterocyclic biogenic amine.