Question

The Pasteurization does not destroy.

• A. Bacterial toxins
• B. Bacteria
• C. Moulds
• D. Yeast

Hint:

Pasteurization kills bacteria but not all toxins—this is a commonly tested concept in food microbiology.

Answer 1

The Correct Option is A

Concept: Pasteurization is a heat treatment process used to destroy pathogenic microorganisms in milk and extend its shelf life. However, it does not eliminate all substances present in milk.

Step 1: Purpose of Pasteurization.
Pasteurization aims to:
• Destroy harmful bacteria (pathogens)
• Reduce microbial load
• Increase shelf life

Step 2: Temperature-Time Combinations.
Common pasteurization methods:
• LTLT: 63°C for 30 minutes
• HTST: 72°C for 15 seconds

Step 3: Effect on Microorganisms.

• Bacteria → Mostly destroyed
• Moulds → Destroyed
• Yeasts → Destroyed

Step 4: Bacterial Toxins.
Bacterial toxins are heat-stable chemical substances produced by bacteria. Many toxins:
• Are resistant to pasteurization temperatures
• Remain in milk even after bacteria are killed

Step 5: Conclusion.
Thus, pasteurization does not destroy bacterial toxins.