Table 4 Minimal inhibitory concentrations (MICs) of Asarum heterotropoides root constituents against five harmful and two nonpathogenic intestinal bacteria using a microtiter plate-based antibacterial bioassay

δ-3-Carene

0.70 cB

0.70 eB

0.70 dB

0.18 cC

0.70 cB

0.18 dC

2.94 bA

Methyleugenol

0.70 cD

1.47 dC

5.80 bA

2.94 aB

2.94 aB

1.47 cC

1.47 cC

1,8-Cineole

1.47 bB

1.47 dB

2.94 cA

1.47 bB

2.94 aA

2.94 bA

2.94 bA

Pellitorine

2.94 aA

1.47 dB

0.70 dC

1.47 bB

2.94 aA

1.47 cB

1.47 cB

(−)-Asarinin

2.94 aA

2.94 cA

2.94 cA

2.94 aA

2.94 aA

2.94 bA

1.47 cB

α-Asarone

2.94 aC

5.80 bB

12.0 aA

1.47 bD

1.47 bD

2.94 bC

1.47 cD

Safrole

2.94 aD

23.50 aA

2.94 cD

2.94 aD

1.47 bE

7.20 aC

12.0 aB

Ciprofloxacin

0.25 dA

0.125 fB

0.125 eB

0.063 dC

0.125 dB

0.063 eC

0.063 dC