Potassium sorbate is a potassium salt of sorbic acid, which is a naturally occurring compound. It is commonly used as a food preservative to inhibit the growth of molds, yeasts, and some bacteria. Here's some information about potassium sorbate:

1. Function: Potassium sorbate is primarily used as a food preservative due to its ability to inhibit the growth of microorganisms. It helps to prevent spoilage and extend the shelf life of various food products, including processed meats, baked goods, dairy products, beverages, and sauces.

2. Antimicrobial Properties: Potassium sorbate is effective against a wide range of microorganisms, including molds, yeasts, and some bacteria. It works by interrupting the metabolism of these microorganisms, preventing their growth, and thereby maintaining the quality and safety of food products.

3. Safety: Potassium sorbate has been extensively studied and is generally recognized as safe for consumption when used in accordance with approved guidelines and regulations. It has a long history of use in the food industry and is considered non-toxic.

4. Usage and Dosage: The appropriate usage and dosage of potassium sorbate vary depending on the specific food product and the regulatory requirements of different countries. Generally, it is used in small quantities, typically ranging from 0.1% to 0.3% of the total weight of the food product.

5. Combination with Other Preservatives: Potassium sorbate is often used in combination with other preservatives, such as sodium benzoate, to enhance the overall effectiveness in inhibiting microbial growth. This combination offers a broad spectrum of protection against different types of microorganisms.

6. Limitations: While potassium sorbate is effective against many microorganisms, it does have limitations. It is less effective against some bacteria and may not completely inhibit the growth of certain molds and yeasts at higher pH levels or in acidic conditions. Therefore, it is important to consider other preservation methods and factors when formulating food products.

7. Labeling: In many countries, including the United States and European Union, potassium sorbate must be listed on food labels if it is used as an ingredient.

When using potassium sorbate or any food preservative, it is important to follow the approved usage levels and guidelines specified for different food products. Adherence to good manufacturing practices and proper storage conditions is also crucial to maintain the quality and safety of food products.