Question

Ultra high temperature (UHT) process of pasteurization of milk is achieved by heating at

• A. 145\(^\circ\)F for 30 minutes
• B. 161\(^\circ\)F for 15 seconds
• C. 280\(^\circ\)F for 2 seconds
• D. 400\(^\circ\)F for 15 seconds

Hint:

UHT pasteurization uses high temperatures (around 280\(^\circ\)F) for very short times (2 seconds) to sterilize the milk without compromising its quality.

Answer 1

The Correct Option is C

The Ultra High Temperature (UHT) pasteurization process is a method of heat treatment used in the food industry, particularly for milk, to destroy harmful microorganisms while preserving the quality of the product. The principle of UHT pasteurization is to rapidly heat the product to a very high temperature for a very short period of time, typically around 280\(^\circ\)F for 2 seconds. - The key purpose of UHT is to achieve sterilization without affecting the flavor, nutritional content, or quality of the milk as significantly as other methods.
- Option (A) represents a lower temperature for a much longer time (145\(^\circ\)F for 30 minutes), which corresponds to the regular pasteurization process but is not considered UHT.
- Option (B) (161\(^\circ\)F for 15 seconds) corresponds to the standard pasteurization process known as HTST (High-Temperature Short-Time) pasteurization, which is also used for milk, but it's not classified as UHT.
- Option (C) (280\(^\circ\)F for 2 seconds) is the correct choice, as this is the typical UHT process that achieves rapid pasteurization, increasing shelf life while maintaining the milk's quality.
- Option (D) (400\(^\circ\)F for 15 seconds) is much higher than required and would likely cause degradation of the milk.
Thus, the correct answer is 280\(^\circ\)F for 2 seconds. Final Answer: \boxed{(C) 280\(^\circ\)F for 2 seconds}