Table 3

Minimum inhibitory and bacteriostatic concentrationsa
Extract E. coli B. subtilis M. mycoides capri
MIC (mg/mL) MBCb(mg/mL) MIC (mg/mL) MBCb(mg/mL) MIC (mg/mL) MBCb(mg/mL)
Astragalus-Aq >10 N/A >10 N/A >10 N/A
Astragalus-ETOH >10 N/A 0.001 0.001 1.0 BC
Astragalus-Com >50 N/A >50 N/A >50 N/A
Goldenseal-Aq >10 N/A >10 N/A 0.05 0.5
Goldenseal-ETOH 1.0 1.0 1.0 BC 1.0 1.0
Goldenseal-Comc 0.1 BC >1 N/A >1 N/A
Elderberry-G 0.0038 0.0038 3.8 3.8 0.38 0.38
Elderberry-365 0.1 BC >10 N/A 0.001 BC
Oregano-LE 0.033 BC 0.00033 BC 0.033 BC
Oregano oil 0.167 BC 0.0167 BC 0.092 0.167
Thyme 1.0 BC >100 N/A 0.5 BC
Calendula >95 N/A >95 N/A >95 N/A
Colloidal silver >0.003 N/A 0.0003 0.0003 >0.003 N/A
Water NI N/A NI N/A NI N/A
95 % Ethanol NI N/A NI N/A NI N/A
Olive oil NI N/A NI N/A NI N/A

aNā€‰=ā€‰3 replicates; MIC/MBC concentrations reflect mean values across trials. Abbreviations: N/A (not applicable); BC (bactericidal); NI (no inhibition by solvents at the lowest dilution [1:10]). Efficacious compounds with a measureable inhibitory concentration or bactericidal activity are bolded.

bColumns marked N/A or BC indicate that MBCs could not be determined due to lack of inhibition (N/A) or bactericidal activity (BC).

cConcentration reflects total alkaloid content.

Arjoon et al.

Arjoon et al. BMC Complementary and Alternative Medicine 2012 12:169   doi:10.1186/1472-6882-12-169

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