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In addition to its antimicrobial properties, potassium metabisulfite also acts as an antioxidant. It helps to prevent oxidation, a process that can alter the color, taste, and nutritional value of food products. For example, when fruits are cut and exposed to air, they tend to brown due to enzymatic oxidation. Adding potassium metabisulfite can slow down this process, keeping fruits looking fresh and appealing for longer. This is particularly beneficial in the production of dried fruits, where appearance plays a crucial role in marketability.
potassium metabisulfite preservative

Potassium sorbate is generally recommended as safe to consume, according to the FDA and the CSPI. Defined as a food additive and preservative, it’s used in very small quantities. Although the specific amount varies by manufacturer, federal law dictates that a product cannot contain more than 0.3 percent potassium sorbate by weight, notes the USDA.