Which of the following is not used as a food prevative ?

Options

A. Sodium salt of benzoic acid
B. Sodium salt of sorbic acid
C. Sodium salt of propanoic acid
D. Sodium salt of palmitic acid

Explanation

To determine which of the following options is not used as a food preservative, we will analyze each option provided:

1. **Sodium salt of benzoic acid**: This compound is widely recognized as an antifungal agent and is commonly used in various food products and pharmaceuticals to prevent spoilage. Therefore, it is a food preservative.

2. **Sodium salt of sorbic acid**: This substance is also used as a food preservative. It is effective against molds and yeasts and is often found in products like cheese, meat, and ketchup. Thus, it is a food preservative.

3. **Sodium salt of propanoic acid**: This compound is primarily used as a preservative for baked goods, such as cakes, breads, and cookies. It helps in preventing mold growth in these products, making it a food preservative.

4. **Sodium salt of palmitic acid**: Unlike the other three options, sodium salt of palmitic acid is not recognized as a food preservative. It is a saturated fatty acid and is primarily used in the production of soaps and cosmetics rather than in food preservation.

Based on the analysis above, the answer to the question "Which of the following is not used as a food preservative?" is:

**Sodium salt of palmitic acid.**