天然生化防腐剂乳酸链球菌素(Nisin)

Natural preservative through biotechnology:Nisin

Nisin是由乳链球菌乳酸菌株在非脂性奶汁中产生的多肽细菌素,它能有选择地抑制菌母的生长繁殖,它不抑制革兰氏阴性菌,酵母或真菌、却抑制多数的革兰氏阳性菌。防腐剂Nisin在酸性条件下,抗菌活性强、溶解性和稳定性增大,是理想的食品防腐剂。

Nisin is a Polypeptide bacteriocin produced by fermentation of a Streptococcus lactis lactic-acid bacterium strain in a non-fat medium. Nisin can inhibit spore-forming bacteria selectively, such as, it does not inhibit Gram-negative organisms, yeasts or fungi but does inhibit most Gram-positive organisms. Nisin demonstrats increased antimicrobiol activity at low PH and is more soluble and stable under acid conditions.