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Food Science and Technology QUESTION #5909
Question 1
Detection of starch adulteration in milk involves adding iodine solution. A positive test gives:
  • A red/pink coloration due to casein-iodine complex
  • A deep blue-black coloration due to amylose-\(\text{I}_2\) complex formation✔️
  • A yellow precipitate due to starch hydrolysis
  • No color change; starch is detected by microscopy only
Correct Answer Explanation
Iodine solution (Lugol's iodine or dilute \(\text{I}_2/\text{KI}\)) reacts with the helical structure of amylose to form an amylose-iodine inclusion complex producing an intense blue-black color. This is a qualitative test for starch adulteration in milk.