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Journal of Dairy Science Vol. 75 No. 9 2353-2363
© 1992 by American Dairy Science Association ®
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Use of a Nisin-Producing Starter Culture Suitable for Cheddar Cheese Manufacture

R. F. Roberts 1, E. A. Zottola 1, and L. L. Mckay 1

1 Minnesota-South Dakota Dairy Foods Research Center, Department of Food Science and Nutrition, University of Minnesota, St. Paul 55108

A nisin-producing starter culture that produced acid at rates suitable for Cheddar cheese manufacture was developed by combining the naturally occurring lactose-fermenting, nisin-producing, and proteinase-positive strain Lactococcus lactis ssp. lactis NCDO 1404 and the lactose-positive, nisin-positive, proteinase-positive transconjugant Lactococcus lactis ssp. cremoris JS102. Cheddar cheese manufactured with 1% NCDO 1404 and .5% JS102 as starter cultures exhibited normal acid development; the cheese was of normal composition and contained ca. 700 IU of nisin/g. Experiments using a nisin resistance factor from plasmid pFG010 to increase resistance to nisin by L. lactis ssp. lactis C2 revealed that nisin resistance and acid development by the recipient increased in the presence of nisin. However, the mechanism of resistance encoded by pFG010 resulted in inactivation of nisin in the test system.

Key Words: nisin • starter culture • plasmid • cheese

Submitted on December 23, 1991
Accepted on April 20, 1992




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