Nisin is a food preservative which is well-known around the world. "Silver-Elephant" brand nisin is developed by Microbiology Research Institute of the Science Academy of China and Zhejiang Silver-Elephant Bio-engineering Co., Ltd. as part of a major program by the Chinese government to develop products for the Chinese food industry. Natamycin (pimaricin) is an antimycotic product which has broad and effective action 2) It not only inhibits the growth of different moulds and yeasts, but also inhibits the production of their toxin 3) Commercial natamycin contains 50% of the active substance 4) Small quantities of natamycin can inhibit all moulds and yeasts, which causes food spoilage