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Appl Environ Microbiol. 1990 November; 56(11): 3515-3518
Copyright © 1990, American Society for Microbiology. All Rights Reserved.

Effect of Dicarboxylic Acids and Aspergillus oryzae Fermentation Extract on Lactate Uptake by the Ruminal Bacterium Selenomonas ruminantium

¹ Departments of Animal and Dairy Science and Microbiology, ² The University of Georgia, Athens, Georgia 30602

ABSTRACT

The objective of this study was to determine the effects of L-aspartate, fumarate, L-malate, and an Aspergillus oryzae fermentation extract (Amaferm) on growth on lactate as well as lactate uptake by Selenomonas ruminantium HD4. Growth of S. ruminantium in medium that contained 2 g of DL-lactate per liter was stimulated approximately twofold by 10 mM L-aspartate, fumarate, or L-malate after 24 h. Both L-aspartate and fumarate increased lactate uptake over 4-fold, while L-malate stimulated uptake over 10-fold. Amaferm enhanced lactate uptake at all concentrations tested (0.5 to 50 g/liter), and the 10-g/liter level increased uptake over 12-fold. A filter-sterilized Amaferm filtrate increased lactate uptake over sevenfold, and growth on lactate was stimulated over twofold by either 2 or 5% (vol/vol) Amaferm filtrate. The Amaferm filtrate also increased the production of acetate, propionate, total volatile fatty acids, and Y_LACTATE from lactate-grown cells. Since the increase in propionate production was greater relative to acetate, a decrease in the acetate:propionate ratio was observed. The concentration of L-malate in the Amaferm filtrate was 1.45 mM, and it appeared that the L-malate content of Amaferm played a role in the stimulation of growth on lactate as well as lactate uptake by S. ruminantium treated with Amaferm.

^* Corresponding author.

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