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Food Science and Technology QUESTION #5899
Question 1
During spray drying of milk, if outlet temperature is too HIGH, the primary consequence is:
  • Product moisture content will be too high causing caking
  • Product will be over-dried causing scorching/browning and loss of heat-sensitive nutrients✔️
  • Fat will separate and coat the powder particles
  • Powder will not reconstitute properly in water
Correct Answer Explanation
High outlet temperature in a spray dryer results in over-drying: excessive moisture loss below target (\(3\text{–}4\%\)), scorching of powder particles on chamber walls, Maillard browning, loss of lysine and heat-sensitive vitamins, and poor solubility of reconstituted powder.