Table 4.

Measurement of zone of inhibition of surfactin on C. perfringens growth at different concentrations

Concentration (μg/ml)	Surfactin from B. subtilis		Surfactin from Bacillus licheniformis fermented products
	Zone of inhibition (cm)
	Mean	SD	Mean	SD
31.25	0.6a,x,e	0.04	0.5a,y	0.00
62.5	0.6a,x	0.02	0.5a,y	0.01
125	0.9b,x	0.02	0.6b,y	0.03
250	1.0c,x	0.05	0.6b,y	0.03
500	1.3d,x	0.03	1.1c,y	0.03

^a–dMeans 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)

^eValues are expressed as mean ± SD (n = 3)