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Food Science and Technology QUESTION #5939
Question 1
The Reductase test (MBRT) result is interpreted based on:
  • The volume of methylene blue reduced per hour
  • The time taken for the blue color to disappear — shorter time indicates poorer milk quality (higher microbial load)✔️
  • The color produced when methylene blue reacts with fat
  • The \(\text{pH}\) change upon addition of methylene blue
Correct Answer Explanation
MBRT interpretation: Very Good: \(>5.5\;\text{h}\) (TPC \(<500{,}000/\text{mL}\)); Good: \(2\text{–}5.5\;\text{h}\); Fair: \(20\;\text{min}\text{–}2\;\text{h}\); Poor: \(<20\;\text{min}\) (TPC \(>20\) million/mL).