Question

Which of the following options describe pasteurisation?

• A. Heating at 70℃ followed by rapid cooling to 10℃.
• B. Heating at 70℃ followed by gradual cooling to 10℃.
• C. Heating at 45℃ followed by rapid cooling to 15℃.
• D. Heating at 45℃ followed by gradual cooling to 15℃.

Answer 1

The correct option is A Heating at 70℃ followed by rapid cooling to 10℃.

Pasteurisation is a technique used to preserve milk. In pasteurisation, the normal milk is heated for 15-30 secs at 70℃ and then rapidly cooled to 10℃. This sudden change of temperature ruptures the cell membrane of the microorganisms, eventually killing them. This helps to preserve the milk.