Question

High Temperature Short Time (HTST) pasteurization gives a continuous flow of milk which is heated to -

• A. 72°C for 15 seconds
• B. 63°C for 30 minutes
• C. 44°C for 44 seconds
• D. 34°C for 34 seconds

Hint:

Memorize the three main pasteurization standards: {LTLT (Batch):} 63°C for 30 minutes. {HTST (Flash):} 72°C for 15 seconds. {UHT (Ultra-High Temp):} 135°C-150°C for 1-2 seconds. These are very frequently asked questions.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Pasteurization is a heat treatment process designed to kill pathogenic microorganisms in milk and reduce the number of spoilage organisms, thereby extending its shelf life. There are different standard time-temperature combinations for this process. The question specifically asks for the standard for High Temperature Short Time (HTST) pasteurization.
Step 2: Detailed Explanation:
Let's analyze the given options:
(A) 72°C for 15 seconds: This is the internationally recognized standard for HTST pasteurization, also known as flash pasteurization. It is used for continuous flow systems and is the most common method in modern large-scale dairies.
(B) 63°C for 30 minutes: This is the standard for Low Temperature Long Time (LTLT) pasteurization, also known as the batch or holder method. It is an older method used for smaller quantities.
(C) 44°C for 44 seconds: This temperature is too low for effective pasteurization.
(D) 34°C for 34 seconds: This temperature is in the range of incubation for many bacteria and is not a pasteurization temperature.
Step 3: Final Answer:
The correct time-temperature combination for HTST pasteurization is 72°C for a minimum of 15 seconds.