TABLE 2.

Lactate utilization by human fecal isolates

Strain/closest speciesChange in fermentation product concn (mM) on YCFA medium plus 35 mM dl-lactateaChange in product concn (mM) on YCFA mediumabCarbon recovery (%)c
Butyratel-Lactated-LactateFormateAcetateButyrateAcetate
E. hallii SL6/1/121.06 ± 1.06−15.29 ± 0.10−14.29 ± 0.510.0 ± 0.0−18.51 ± 0.961.42 ± 1.42−4.96 ± 3.2690.5
E. hallii SM6/125.70 ± 0.43−12.70 ± 0.50−18.70 ± 1.060.03 ± 0.03−21.20 ± 2.081.42 ± 0.05−2.61 ± 2.3698.8
E. hallii L2-722.58 ± 0.76−15.50 ± 0.0−16.50 ± 0.01.09 ± 1.55−14.77 ± 0.930.60 ± 0.03−1.58 ± 1.7398.3
A. caccae L1-9223.35 ± 1.16−13.66 ± 0.85−14.91 ± 0.87−0.05 ± 0.01−21.98 ± 2.451.99 ± 0.09−2.35 ± 2.0394.4
A. caccae P225.01 ± 1.0−15.50 ± 1.0−16.50 ± 1.01.03 ± 1.0−21.19 ± 1.01.92 ± 1.003.88 ± 1.0095.4
SS2/112.98 ± 0.190.57 ± 0.40−15.49 ± 1.010.18 ± 0.02−12.51 ± 1.272.24 ± 0.26−4.25 ± 4.6894.7
SSC/213.49 ± 0.0−0.1 ± 0.78−9.51 ± 6.10.36 ± 0.0−12.12 ± 0.02.37 ± 0.09−0.16 ± 1.32119.3
  • a Change in concentration compared with uninoculated controls during 24 h of incubation at 37°C. Values are means of triplicate cultures from one experiment and are shown ± standard deviation.

  • b No significant change in formate or lactate occurred in basal YCFA medium.

  • c Calculated as described in Table 3 footnotes.