Table 4
The diameter of zone of inhibition of Cynanchi wilfordii root extracts against Propionibacterium acnes and Staphylococcus aureus

Bacteria	Extract	Diameter of zone of inhibition (mm)
		2 mg/disc	5 mg/disc	10 mg/disc
P. acnes	Water	0.0	6.2±0.2	7.2±0.1
	Ethanol	0.0	7.0±0.1	8.9±0.2
	Butanol	0.0	6.3±0.1	7.5±0.1
S. aureus	Water	0.0	6.1±0.1	7.2±0.1
	Ethanol	0.0	7.1±0.2	9.1±0.1
	Butanol	0.0	6.2±0.1	7.9±0.2