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Journal of Dairy Science Vol. 51 No. 10 1573-1578
© 1968 by American Dairy Science Association ®
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D-Leucine as an Auto-inhibitor of Lactic Streptococci1

S. E. Gilliland and M. L. Speck

Department of Food Science, North Carolina State University, Raleigh

ABSTRACT

A ninhydrin positive zone isolated by paper chromatography from the spent broth of a mixed strain lactic streptococcus culture which had been grown with automatic pH control was found to be inhibitory to the culture. Contents of the zone from the spent broth were stable to acid hydrolysis which indicated that a peptide was not responsible. Thin-layer chromatography of material eluted from the inhibitory zone indicated that the inhibitor was leucine. Experiments in which the effects of leucine on growth were studied indicated L-leucine was not inhibitory while D-leucine was at concentrations as low as 1 mg/ml, indicating the auto-inhibitor to be D-leucine.

FOOTNOTES

1 Paper number 2627 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, North Carolina.






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Copyright © 1968 by the American Dairy Science Association ®.