CPT Shelf Life & Product Protection 2

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?

Accepted Answer

Oxygen (O₂)

Answer

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?

Accepted Answer

Calcium oxide (quicklime)

Answer

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?

Accepted Answer

Iron powder

Answer

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?

Accepted Answer

Adding a UV-absorbing additive to the polymer resin

Answer

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:

Accepted Answer

Gases and vapors under specified conditions

Answer

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.

(CPT) Certified Packaging Technologist Practice Test

(CPT) Certified Packaging Technologist Practice Test

CPT Shelf Life & Product Protection 2