Question

Which of the following is the time-temperature combination for LTST pasteurization?

(a) 72°C to 74°C for 15 to 20 seconds

(b) 135°C to 140°C for 2 to 4 seconds

(c) 63°C for 30 minutes

(d) 57°C to 68°C for 15 min

I got this question by my school principal while I was bunking the class.

My question is taken from Heat Exchangers topic in division Building Blocks of Dairy Processing of Dairy Engineering

Answer 1

Correct answer is (c) 63°C for 30 minutes

Explanation: Low temperature long time (LTLT) pasteurization involves heating the milk to 63°C for 30 minutes. The extended holding time causes alteration in the milk protein structure and taste.