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Food Science and Technology QUESTION #5922
Question 1
Which statement about UHT milk is TRUE?
  • UHT milk must be stored refrigerated immediately after production
  • UHT milk can be stored at room temperature for \(6\text{–}9\) months due to commercial sterility achieved by aseptic processing (\(135\text{–}150^{\circ}\text{C}\) for \(2\text{–}5\) s) and packaging✔️
  • UHT milk has a higher nutritional value than HTST-pasteurized milk due to higher temperature use
  • UHT processing completely destroys all vitamins in milk
Correct Answer Explanation
UHT milk achieves commercial sterility and is packaged aseptically, allowing ambient storage for \(6\text{–}9\) months. However UHT treatment causes more heat damage than HTST: lysine loss (\(\approx 5\text{–}10\%\)), thiamine loss (\(\approx 5\text{–}20\%\)), and slight cooked flavor from \(\text{H}_2\text{S}\) release and Maillard reactions.