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Food Science and Technology QUESTION #5881
Question 1
The Clot-on-Boiling (COB) test detects milk that would coagulate during sterilization. What condition causes a positive COB test?
  • Low fat content
  • High acidity \((>0.21\%\) lactic acid) or abnormal salt balance (colostrum/mastitic milk)✔️
  • Antibiotic residues
  • Excessive water adulteration
Correct Answer Explanation
COB-positive milk forms clots when boiled, indicating either high titratable acidity \((>0.21\%\) lactic acid) or abnormal protein/mineral balance as in colostrum or mastitic milk. Such milk cannot withstand sterilization temperatures.