Propionic acid, sodium salt, also known as sodium propionate, is a food additive and preservative commonly used in various food products. Here's some information about sodium propionate:

1. Function: Sodium propionate is primarily used as a preservative to inhibit the growth of molds, bacteria, and other microorganisms in food. It helps extend the shelf life of food products by preventing spoilage and maintaining their quality and safety.

2. Chemical Properties: Sodium propionate is the sodium salt of propionic acid. It is typically available as a white crystalline powder or granular form, which is easily soluble in water. When added to food, it dissociates into sodium ions and propionate ions, which exert their preservative effect.

3. Common Uses: Sodium propionate is used in a wide range of food products, including bread, baked goods, dairy products, processed meats, beverages, and snack foods. It is particularly effective in inhibiting the growth of mold and mold-related spoilage in bakery products.

4. Preservative Action: Sodium propionate works by inhibiting the growth of microorganisms, including molds and bacteria, that cause food spoilage. It acts by disrupting the metabolism and cellular processes of these microorganisms, preventing their growth, and ultimately extending the shelf life of the food product.

5. Safety Considerations: Sodium propionate is considered safe for consumption when used in accordance with the approved limits and regulations. It has undergone thorough evaluation by regulatory authorities, such as the U.S. Food and Drug Administration (FDA), and is recognized as a safe food additive. However, some individuals may be sensitive or allergic to sodium propionate, and it may cause adverse reactions in rare cases.

6. Regulation and Labelling: The usage of sodium propionate as a food additive is regulated in many countries, and food manufacturers are required to comply with specific guidelines and usage levels. It may be listed on food labels under its respective international numbering system (E281 in the European Union) or as "sodium propionate."

As with any food additive, it is important to note that individual sensitivities and dietary needs may vary. If you have concerns about sodium propionate or any specific food additive, it is advisable to consult with a healthcare professional or a registered dietitian who can provide guidance based on your specific circumstances.