It is used as a buffering agent in solutions, emulsions, beverage and food stuffs as well as an antioxidant. It is approved by the FDA CFR 181.29 as an indirect additive. Na4EDTA forms water-soluble coordination compounds with multivalent metal ions over a wide pH range. Potassium Benzoate replaces sodium benzoate in applications where the preserving power of benzoic acid is required and a low sodium content is desirable. Potassium Gluconate has applications similar to sodium gluconate and is also used as a potassium source in diabetic food and pharmaceuticals.
Potassium Sorbate is the very soluble salt of sorbic acid.
It is used in many food products as a preservative with an effective pH range up to approximately 5.5 making it useful over a wider range than benzoates. Many dairy products with standards of identity allow the use of potassium sorbate as an optional ingredient, especially to check mold growth in certain kinds of cheese. Sodium Benzoate , the sodium salt of benzoic acid, is most suitable for use as an antimicrobial agent in foods and beverages which are naturally in the pH range below 4.5 or can be brought there by addition of a suitable acidulant. Sorbic acid is used in cheese making, pickles and other food applications. Mainly used for its humectant properties in various food products, it also is used in sugarfree confections for crystallization control.