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Food Science and Technology QUESTION #5877
Question 1
The alcoholic acidity test on milk works on the principle that:
  • Alcohol raises the pH of milk
  • Unstable proteins due to high acidity or colostrum precipitate in alcohol✔️
  • Fat globules dissolve in alcohol revealing acidity
  • Lactose ferments rapidly in alcohol
Correct Answer Explanation
The alcohol precipitation test relies on ethanol (\(68\text{–}72\%\)) dehydrating proteins. Milk with elevated acidity, high calcium ions, or abnormal protein (colostrum, mastitic milk) has destabilized casein micelles that precipitate upon alcohol addition.