Question

What is the temperature of thermisation for milk?

(a) 125 – 138°C

(b) 115 – 120°C

(c) 63°C

(d) 63 – 65°C

This question was posed to me in final exam.

Enquiry is from Process Engineering Applications in chapter Process Engineering Applications in Food Industry of Food Processing Unit Operations

Answer 1

Right choice is (d) 63 – 65°C

For explanation: Ultra-pasteurization temperature is 125 – 138°C for 2-4 seconds. Sterilization of milk in container is 115 – 120°C for 20-30 minutes. LTLT pasteurization of milk is 63°C for 30 minutes and for thermisation it is 63 – 65°C for 15 seconds.