Natamycin is also called pimarcin or tennecetin, which is produced by Streptomyces sp. and purified by modern separation technology. Natamycin is a fungicide that prevents yeasts and moulds from appearing in foods. It is extremely effective when used in small amounts. It is used in smaller quantities than potassium sorbate, and unlike other sorbates it prevents yeasts and moulds from migrating into the product, eliminating the cost of reapplication. The action of natamycin does not destroy other microorganisms, meaning that it does not alter the foodâ??s natural maturing process. Natamycin contains 50% lactose/glucose/salt and 50% Natamycin, which prevents the formation of moulds and yeasts on the surface.Unlike other antimicrobial agents, it does not affect the appearance, taste or colour of the products.