Question:
COB stands for:
COB stands for:
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The COB test is only positive when the acidity of the milk exceeds 0.20% (as lactic acid). Fresh milk (0.14–0.16% acidity) will never clot on boiling.
Updated On: Jul 4, 2026
- Clot on Boiling
- Crumble on Boiling
- Clotting of Bacteria
- Crumbling of Bacteria
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The Correct Option is A
Solution and Explanation
Concept:
The COB test is a rapid platform test used at milk collection centers to determine the freshness and heat stability of milk.
• Acidity: Bacteria in milk produce lactic acid over time.
• Coagulation: High acidity causes milk proteins (casein) to become unstable.
Step 1: Defining the test procedure.
A small sample of milk is taken in a test tube and heated to boiling. If the milk is acidic or colostrum is present, it will coagulate.
Step 2: Interpreting the results.
"Clotting" indicates that the milk has a high microbial load or has soured. Such milk cannot withstand the heat of pasteurization and is rejected.
Step 3: Final Identification.
The acronym COB stands for Clot on Boiling. Final Answer: (A)
• Acidity: Bacteria in milk produce lactic acid over time.
• Coagulation: High acidity causes milk proteins (casein) to become unstable.
Step 1: Defining the test procedure.
A small sample of milk is taken in a test tube and heated to boiling. If the milk is acidic or colostrum is present, it will coagulate.
Step 2: Interpreting the results.
"Clotting" indicates that the milk has a high microbial load or has soured. Such milk cannot withstand the heat of pasteurization and is rejected.
Step 3: Final Identification.
The acronym COB stands for Clot on Boiling. Final Answer: (A)
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