Question

Benzoic acid or benzoates are used to preserve food from
A. Insects
B. Yeast
C. Clostridia
D. Molds
Choose the correct answer from the options given below:

• A. A and B only
• B. B and C only
• C. A, C and D only
• D. B and D only

Hint:

Remember that benzoic acid and sorbic acid are classic anti-fungal preservatives used in acidic foods. Think of them as targeting the "fungal foes" of acidic products: yeasts and molds.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Benzoic acid and its salts (like sodium benzoate) are common chemical food preservatives. Their effectiveness is targeted against specific types of spoilage organisms, and they work best under certain conditions (acidic pH).
Step 2: Detailed Explanation:
Let's evaluate the targets of benzoic acid:


A. Insects: Benzoic acid is an antimicrobial agent, not an insecticide. It has no effect on insects.

B. Yeast: Yeasts are a primary target for benzoates. These preservatives are highly effective at inhibiting the growth of acid-tolerant fermentative yeasts in acidic foods like fruit juices, jams, and carbonated drinks.

C. Clostridia: Clostridia are bacteria, many of which are obligate anaerobes and can form spores. Benzoates have limited antibacterial activity and are generally not the preservative of choice against spore-forming bacteria like Clostridia. Nitrites are more commonly used for this purpose, especially in cured meats.

D. Molds: Like yeasts, molds are fungi and are also primary targets for benzoates. The preservative is effective in preventing mold growth on the surface of acidic foods.

Step 3: Final Answer:
Benzoic acid and benzoates are primarily used to preserve food from yeasts (B) and molds (D).