Question

The bactericidal contains ...........

• A. Membrane filtration
• B. Freeze-drying
• C. Ionizing radiation
• D. Deep freezing

Hint:

To distinguish these terms:
- "-cidal" means to kill (e.g., bactericidal, homicidal).
- "-static" means to stand still or stop growth (e.g., bacteriostatic).
Radiation and heat are bactericidal treatments, whereas freezing and drying are bacteriostatic.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Antimicrobial treatments used in food preservation are classified as either bactericidal (agents that directly kill microorganisms) or bacteriostatic (agents that inhibit microbial growth and reproduction without killing the cells).

Step 2: Detailed Explation:
Let's alyze the effects of the given treatments on bacterial cells:
1. Membrane filtration: This is a physical separation technique.
It removes bacteria from liquid foods based on pore size, but it does not chemically kill or destroy the bacterial cells themselves.
2. Freeze-drying (Lyophilization) and Deep freezing: These are bacteriostatic preservation methods.
They preserve foods by removing water or lowering the temperature to stop microbial metabolism.
While some cells may die during freezing, many remain viable and can resume active growth once the food is thawed or rehydrated.
3. Ionizing radiation (Cold Sterilization): This method uses high-energy gamma rays, electron beams, or X-rays to treat food.
The radiation penetrates bacterial cells and directly breaks chemical bonds in their D.
It also radiolyzes water molecules within the cell, creating reactive hydroxyl radicals that destroy cellular membranes and proteins.
This direct destructive action makes ionizing radiation a highly effective bactericidal treatment.

Step 3: Fil Answer
The treatment that acts as a true bactericidal agent among the options is Ionizing radiation.