Question

Which is true about HTST pasteurization?

• A. 63°C for 30 min
• B. 50°C for 10 min
• C. 72°C for 15 sec
• D. 100°C for 5 sec

Hint:

LTLT = old batch; HTST = modern, faster, continuous!

Answer 1

The Correct Option is C

Key Concept: Pasteurization has two standard time-temperature combinations that achieve the same bacterial kill by trading time for heat.

Why it's correct: HTST (High Temperature Short Time) uses 72°C for 15 seconds in continuous-flow systems — fast, energy-efficient, and the industry standard in modern dairy plants.

Why others fail: 63°C/30 min is LTLT (the older batch method, not HTST); 50°C/10 min is too mild to kill pathogens; 100°C/5 sec would scorch/alter the milk and isn't a recognized pasteurization standard.