Natamycin (E235) is an anti-fungal compound produced by Streptomyces fermentation. Except inhibiting the growth of various molds and yeasts, Natamycin can also reduce the production of mycotoxins. As a food preservative, it’s usually used in cheese, cakes and other foods.

Nisin (E234) is an antimicrobial peptide produced by microbial fermentation. It can effectively inhibit the reproduction of Gram-positive bacteria and inhibit heat-resistant Bacillus and spores exclusively. As a food preservative, it’s usually used in meat products, dairy drinks and other fields.

Polylysine is a homopolymer of L-lysine, one of the essential amino acids. It is linked by peptide bond formed with α-carboxyl of L-lysine and ε-azyl from other L-lysine, with molecular weight between 4130-5776, usually used as food preservative.

Pullulan is a polymer biological polysaccharide produced by microbial fermentation. It has good film forming property, and its aqueous solution has good adhesion, which make it widely used in various food products for candy, snacks etc.

Gamma aminobutyric acid (GABA) is an amino acid that works as a neurotransmitter in human brain. Neurotransmitters function as chemical messengers. GABA is considered an inhibitory neurotransmitter because it inhibits some brain signals and decreases activity in human nervous system.