CFS Food Packaging & Shelf Life 1 — Questions and Answers
Question 1: What does MAP stand for in food packaging technology?
- Modified Atmosphere Packaging (Correct answer)
- Maximum Allowable Preservation
- Moisture-Adjusted Processing
- Microbial Activity Prevention
Correct answer: Modified Atmosphere Packaging
MAP stands for Modified Atmosphere Packaging, where the gas composition surrounding food is altered to extend shelf life by reducing oxidation or microbial growth.
Question 2: Which property of a packaging material measures its resistance to gas transmission?
- Tensile strength
- Oxygen Transmission Rate (OTR) (Correct answer)
- Seal integrity
- Burst strength
Correct answer: Oxygen Transmission Rate (OTR)
Oxygen Transmission Rate (OTR) measures how much oxygen can permeate through a packaging material per unit time and area, which is critical for oxygen-sensitive foods.
Question 3: A water activity (aw) value of 0.85 or below generally inhibits the growth of which organisms?
- Xerophilic molds
- Most pathogenic bacteria (Correct answer)
- Halophilic bacteria
- Osmophilic yeasts
Correct answer: Most pathogenic bacteria
Most pathogenic bacteria are inhibited at water activity levels at or below 0.85, making this a critical control threshold for intermediate-moisture foods.
Question 4: What type of packaging incorporates agents that actively interact with the food or its headspace environment?
- Passive packaging
- Modified atmosphere packaging
- Active packaging (Correct answer)
- Vacuum packaging
Correct answer: Active packaging
Active packaging incorporates functional agents such as oxygen scavengers, antimicrobials, or moisture absorbers that actively interact with the food or its environment to extend shelf life.
Question 5: Which packaging polymer is recognized as one of the best oxygen barrier materials used in multilayer food packaging?
- Polyethylene (PE)
- Polypropylene (PP)
- Ethylene vinyl alcohol (EVOH) (Correct answer)
- Polyester (PET)
Correct answer: Ethylene vinyl alcohol (EVOH)
EVOH (Ethylene vinyl alcohol) provides an exceptionally low oxygen transmission rate and is widely used as an inner barrier layer in multilayer food packaging structures.
Question 6: The Arrhenius equation is commonly applied in food shelf life studies to:
- Calculate microbial colony growth rates
- Predict chemical reaction rates at different storage temperatures (Correct answer)
- Determine packaging material burst strength
- Measure equilibrium relative humidity
Correct answer: Predict chemical reaction rates at different storage temperatures
The Arrhenius equation relates chemical reaction rate constants to temperature, allowing food scientists to predict how storage temperature affects shelf life-limiting deterioration reactions.
Question 7: Which test method is standardized to determine the seal strength of flexible food packaging?
- Burst test
- Peel test (Correct answer)
- Compression test
- Drop test
Correct answer: Peel test
The peel test measures the force required to separate a heat seal, quantifying seal strength and integrity of flexible food packaging.
CFS Food Packaging & Shelf Life 1
What does MAP stand for in food packaging technology?