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Beijing Oriental Rada Biotech Polylysine is a natural substance from microbial metabolism. It is widely used as food preservative. It can inhibit the growth of Gram(+) and Gram(-) bacteria such as E. coli and Bacillus subtilis, yeast, lactic acid bacteria, Staphlacoccus aureus, ect..ε-Polylysine is produced by the aerobic fermentation of streptomyces albulus and followed with a series of filtration, extraction and purification processes.ε-Polylysine is slightly bitter, hygroscopic, light yellow power. It is soluble in water, slightly soluble in ethanol. The molecular of ε-Polylysine is a straight chain polymer of L-lysine. Its activity is not affected by pH, and stable when heated（120℃ for 20 min）.

Beijing Oriental Rada Biotech Nisin is a polypeptide, with 34 amino acid residues widely used as a food preservative. Nisin possesses anti-microbial activity against a wide range of Gram-positive bacteria and their spores in food.