527 Q15 CO2 Utilization in Food

The monoethanolamine (MEA) absorption process produces food-grade and beverage-grade CO₂.

• True

• False

Which of the following is a property of CO₂ that gives it an advantage to be used in food industries?

(check all that applies; no partial credit)

• Non-oxidizing

• Inhibitive and partial disinfecting action on certain bacteria

• Ability to stimulate taste sensation

• Non-carcinogenic

• Extraction of certain food constituents

The most common application of CO₂ is in

• producing carbonated soft drinks and soda water.

• preserving grains and meats.

• extracting proteins and oils.

• controlling the ripening rate of fruits and vegetables.

Increasing the CO₂ level in the surroundings of food material prolongs its shelf life but has an adverse effect on food quality.

• True

• False

Which of the following storage atmospheres are used in modified atmosphere packaging (MAP) and controlled atmosphere storage (CAS)?

• CO₂ + N₂ + little O₂

• O₂ + little CO₂

• O₂ + little N₂

• CO₂ + chemical insecticides

Use of pressurized CO₂ with no or mild heat treatment could provide an alternative to high-temperature pasteurization for heat-sensitive foods.

• True

• False

High-pressure CO₂ treatment is better than low-pressure one.

• True

• False

Liquid CO₂ is used

(check all that applies; no partial credit)

• as a safe, low-cost refrigerant

• for cryo-grinding of foods

• for the extraction of food flavors, proteins, and fats

• for cryogenic freezing and preservation of food

• as a low-cost solvent for carbon capture

Dry ice (solid CO₂) is a better refrigerant than normal ice (solid H₂O) because

(check all that applies; no partial credit)

• dry ice has a greater refrigeration effect (i.e., latent heat of CO₂ sublimation, compared to latent heat of H₂O melting).

• dry ice has a lower temperature.

• after sublimation, the gaseous CO₂ reduces the O₂ content in the air, thus preserving the food.

Compared to traditional extraction solvents, supercritical CO₂ offers the advantage of being easily separable from the extract after the extraction process.

• True

• False