Isolation of Nisin-resistant Streptococcus thermophilus

Abstract

Abstract: The MIC of nisin to Streptococcus thermophilus was determined by serial twofold dilutions in skim milk medium and whey medium. In skim milk medium, Streptococcus thermophilus 9 was tamed by gradually increasing the nisin concentration until its resistance reaching 300 IU of nisin per ml. The two nisin-resistant Streptococcus thermophilus strains 9.31 and 9.4, fit for two yogurt culture were gained and assayed by production performance identification and genetic stability test.

Key words: nisin, isolation of nisin-resistant, Streptococcus thermophilus

JIAO Shi-Yao, ZHANG Lan-Wei. Isolation of Nisin-resistant Streptococcus thermophilus[J]. FOOD SCIENCE, 2005, 26(4): 115-118.

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Isolation of Nisin-resistant Streptococcus thermophilus

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