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Niacin Saturation Constants for Lactobacillus plantarum and Treponema bryantii^{1, 2,}

University of Wisconsin, Madison 53706

ABSTRACT

Lactobacillus plantarum 17-5 and Treponema bryantii RUS-1 were grown in batch culture with niacin as the growth-limiting nutrient. Growth rates determined from linear portions of plots of natural log optical density versus time were used to estimate the saturation constants for niacin. These were .00066 µg/ml (5.36 nM) for Treponema bryantii and .0012 µg/ml (9.75 nM) for Lactobacillus plantarum. These saturation constants suggest that .012 to .022 µg/ml, respectively, would provide for 95% of their maximum specific growth rates. Niacin concentrations usually present in rumen fluid of animals not receiving supplemental dietary niacin are sufficient to support maximum growth rates of these two bacterial species that require niacin.

¹ Paper number 869 from the Department of Meat and Animal Science. Research supported by the College of Agricultural and Life Sciences, University of Wisconsin-Madison, Hatch Grant Number 2629 and the Tunisia Agricultural Technology Transfer project.

² We thank N. J. Benevenga for his helpful advice.