Question

Which of the following is the source of contamination of milk with vinyl chloride?

• A. Detergents
• B. Pesticides
• C. Mould infestation
• D. Packaging material

Hint:

Vinyl chloride is the monomer of Polyvinyl Chloride (PVC). Its presence in food is always due to migration from plastic packaging materials.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Chemical contaminants can enter the milk supply chain at various stages, including production, processing, and packaging.
Vinyl chloride is a synthetic organic compound used as a precursor monomer in the manufacturing of plastics.

Step 2: Detailed Explanation:
Vinyl chloride is the monomer used to produce Polyvinyl Chloride (PVC), a plastic widely used in food packaging, tubing, and storage containers.
If the polymerization process is incomplete, trace amounts of unreacted, free vinyl chloride monomer remain trapped within the plastic matrix of the packaging material.
Because vinyl chloride is a small, lipophilic molecule, it can migrate from the PVC packaging, gaskets, or transfer tubes directly into the milk, especially into the fat phase.
Detergents used in dairy sanitization do not contain vinyl chloride.
Pesticides and agricultural run-offs introduce other organochlorine or organophosphate residues, but not vinyl chloride monomer.
Mould infestations produce mycotoxins (such as aflatoxins) rather than synthetic plastic monomers.
Therefore, packaging material is the primary source of vinyl chloride contamination in milk.

Step 3: Final Answer
The correct option is (D).