1, benzoic acid: benzoic acid, also known as benzoic acid, in acidic conditions on the growth and reproduction of molds, yeast and other inhibitory effect.

2, sorbic acid: sorbic acid can control the growth and reproduction of mold, yeast and other food, as well as control the production of toxins such as Clostridium botulinum.

3, sulfite: sulfite has antioxidant, antiseptic and bleaching functions, widely used in food processing.