Natamycin: ① It is a polyene macrolide antibiotic of the formula C33H47O13, crystallized as a white powder, containing three molecules of water of crystallization, a melting point of about 280 degrees Celsius. Natamycin is a natural, safe, efficient biological fungal inhibitors, are widely used in cheese, meat products, beverages and other food preservative, can effectively kill inhibit molds, yeasts and other fungal growth in food and inhibit fungal toxins, and can effectively reduce the cost of food production, to extend the shelf-life. (2) nearly white to cream yellow powder, odorless and tasteless, insoluble in water, slightly soluble in methanol, soluble in glacial acetic acid, used to mold easily proliferation, food surface exposed to the air, good resistance to mildew. Content: 50%