Antibacterial activity of Bacillus species-derived surfactin on Brachyspira hyodysenteriae and Clostridium perfringens

AMB Express

Table 2 Measurement of zone of inhibition of surfactin on B. hyodysenteriae growth at different concentrations

Concentration (μg/ml)	Surfactin from B. subtilis		Surfactin from B. licheniformis fermented products
	Zone of inhibition (cm)
	Mean	SD	Mean	SD
50	0.3^a,x,d	0.02	0.2^a,y	0.01
100	0.6^b,x	0.03	0.2^a,y	0.01
250	0.9^bc,x	0.02	0.4^b,y	0.01
500	1.4^c,x	0.04	0.5^b,y	0.02

^a–cMeans within a column with no common superscript are significantly different (P <0.05)
^x–yMeans within a row with no common superscript are significantly different (P <0.05)
^dValues are expressed as mean ± SD (n = 3)