Table 5. Comparison of diacetyl production with the addition of different concentrations of Fe2+ or Mn2+ ions
Concentration (%, w/v) | Diacetyl from LRCC5306 (mg/L) |
Iron | Manganese |
0 | 42.28±1.58 | 43.66±2.09 |
0.0001 | 43.03±1.76 | 42.18±1.76 |
0.001 | 66.58±2.73a | 62.25±0.78a |
0.01 | 66.52±2.82a | 62.96±2.12a |
0.1 | 63.60±1.45a | 61.25±1.20a |
1.0 | 65.46±2.34a | 60.83±2.42a |
Results are expressed as mean±SE (n=3).
MRS broth was used as the basal medium, citrate was added before sterilization (autoclave, 121°C, 15 min). The initial concentration of diacetyl was 0.
Means in the same column with different lowercase superscript letters are significantly different at p<0.05.