CPT Shelf Life & Product Protection 2 — Questions and Answers
Question 1: Modified Atmosphere Packaging (MAP) for fresh red meat typically uses a high concentration of which gas to maintain the bright red oxymyoglobin color?
- Nitrogen (N₂)
- Carbon dioxide (CO₂)
- Oxygen (O₂) (Correct answer)
- Argon (Ar)
Correct answer: Oxygen (O₂)
High-oxygen MAP (typically 70–80% O₂) is used for fresh red meat to maintain the bright red color associated with oxymyoglobin, which consumers associate with freshness.
Question 2: Which desiccant material works by adsorbing moisture through a chemical reaction rather than physical adsorption, making it effective at very low humidity levels?
- Silica gel
- Molecular sieve
- Calcium oxide (quicklime) (Correct answer)
- Activated clay
Correct answer: Calcium oxide (quicklime)
Calcium oxide (quicklime) reacts chemically with water to form calcium hydroxide, making it highly effective at very low humidity levels where physical adsorbents like silica gel are less effective.
Question 3: Oxygen scavengers incorporated into packaging are most commonly based on which active ingredient?
- Activated carbon
- Iron powder (Correct answer)
- Citric acid
- Bentonite clay
Correct answer: Iron powder
Iron powder-based oxygen scavengers work by oxidizing iron in the presence of moisture, effectively consuming oxygen from the package headspace and extending product shelf life.
Question 4: For products sensitive to ultraviolet (UV) light, which packaging solution provides the most direct and effective protection?
- Adding a UV-absorbing additive to the polymer resin (Correct answer)
- Using transparent PET bottles
- Increasing wall thickness
- Adding nitrogen flush
Correct answer: Adding a UV-absorbing additive to the polymer resin
Incorporating UV-absorbing additives (such as UV stabilizers or pigments) directly into the polymer resin provides effective light barrier protection throughout the packaging material.
Question 5: Hermetic sealing is defined as packaging that prevents the passage of:
- Liquids only
- Solids, liquids, and gases
- Gases and vapors under specified conditions (Correct answer)
- Only pathogenic microorganisms
Correct answer: Gases and vapors under specified conditions
A hermetic seal is one that prevents the passage of gases and vapors under specified test conditions, providing a complete barrier to atmospheric gases and maintaining the internal package environment.
Question 6: Which of the following packaging formats provides the best combination of oxygen and moisture barrier for long shelf life dry products without refrigeration?
- Standard polyethylene bag
- Paper bag with wax coating
- Metallized film or foil laminate pouch (Correct answer)
- Oriented polypropylene (OPP) film bag
Correct answer: Metallized film or foil laminate pouch
Metallized film or aluminum foil laminate pouches provide excellent barriers to both oxygen and moisture vapor, making them ideal for dry products requiring extended ambient shelf life.
Question 7: Tamper-evident packaging features are required under which U.S. regulatory framework for over-the-counter drug products?
- USDA FSIS regulations
- FDA 21 CFR Part 211 (cGMP for OTC drugs) (Correct answer)
- EPA pesticide regulations
- FTC labeling requirements
Correct answer: FDA 21 CFR Part 211 (cGMP for OTC drugs)
FDA 21 CFR Part 211 (Current Good Manufacturing Practice regulations for OTC drug products) requires tamper-evident packaging features to protect consumers from product tampering.
CPT Shelf Life & Product Protection 2
Modified Atmosphere Packaging (MAP) for fresh red meat typically uses a high concentration of which gas to maintain the bright red oxymyoglobin color?