Pungent principle, a sinigrin, of crucifers is a

Options

A. Glycoside having sulphur
B. Glycoside having cyanide
C. Glycoside having special amino acids
D. Tannin

Answer

**Step-by-Step Solution:**

1. **Identify the Compound**: The pungent principle referred to in the question is sinigrin, which is associated with cruciferous plants.

2. **Classify Sinigrin**: Sinigrin is classified as a glucosinolate. Glucosinolates are a group of sulfur-containing compounds found in many plants, particularly in the family Brassicaceae (crucifers).

3. **Understand the Structure**: Glucosinolates, including sinigrin, contain a sulfur atom and a glycoside structure. This means they have a sugar component attached to a sulfur-containing moiety.

4. **Role of Myrosinase**: When plant tissues containing sinigrin are disrupted (for example, when they are crushed), an enzyme called myrosinase is activated. This enzyme is crucial for the breakdown of glucosinolates.

5. **Pungent Smell and Taste**: The action of myrosinase on sinigrin leads to the production of compounds that are responsible for the pungent smell and taste associated with cruciferous vegetables.

6. **Reference Material**: Sinigrin and myrosinase are often used as reference materials in the isolation and identification of glucosinolates in various studies.

7. **Conclusion**: Therefore, the pungent principle of sinigrin in crucifers is due to its classification as a glucosinolate containing sulfur, and its interaction with the enzyme myrosinase.

**Final Answer**: The pungent principle, sinigrin, of crucifers is a glucosinolate containing sulfur.

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