Step 1: Understanding the Concept:
Traditional packaging acts as a passive barrier, protecting food from dust, moisture, and light.
In contrast, active packaging systems interact chemically or biologically with the food or headspace to actively extend its shelf life.
Detailed Explanation:
Active packaging is defined by the incorporation of active additives directly into the packaging material or film (or within sachets placed inside the package).
These additives interact with the food or the internal atmosphere to extend shelf life.
Examples of these active packaging additives include:
- Oxygen Scavengers: Absorb residual oxygen to prevent oxidation of fats and limit aerobic microbial growth.
- Moisture Regulators: Absorb excess moisture to prevent fungal growth on dry foods.
- Antimicrobial Agents: Slowly release organic acids or essential oils from the packaging film to inhibit bacterial growth on the food surface.
- Ethylene Absorbers: Remove ethylene gas to delay the ripening of fresh fruits and vegetables.
While Modified Atmosphere Packaging (MAP) focuses on maintaining or altering the initial gaseous composition (A), active packaging is characterized by the physical incorporation of active agents into the packaging structure itself.
Step 2: Final Answer:
Active packaging is defined by the incorporation of active additives into the packaging film.