Antagonistic Potential of Soil Streptomyces Isolates from Southern Thailand to Inhibit Foodborne Bacterial Pathogens

Table 4

Antibacterial property of crude extracts against selected pathogenic bacteria determined using the agar well diffusion assay and colorimetric broth microdilution method.

Crude extract and control	Diameter of the inhibition zone (mm)		MIC/MBC (μg/ml)
	SA	BC	SA	BC
7BAC-1FE	0.00 ± 0.00^c	0.00 ± 0.00^c	nd	nd
1BAC-7FE	8.17 ± 0.29^a	9.33 ± 1.15^a	512/>1024	512/512
11BAC-7FE	0.00 ± 0.00^c	0.00 ± 0.00^c	nd	nd
12BAC-7FE	8.83 ± 0.29^a	13.00 ± 0.00^ab	256/512	256/256
2BAC-10FE	0.00 ± 0.00^c	0.00 ± 0.00^c	nd	nd
4TAK-5FE	0.00 ± 0.00^c	0.00 ± 0.00^c	nd	nd
9TAK-5FE	0.00 ± 0.00^c	0.00 ± 0.00^c	nd	nd
Streptomycin	19.50 ± 0.87^b	26.50 ± 3.04^b	3.13/6.25	3.13/6.25

Data are expressed as mean ± SD of 3 replicates. Results with different lowercase superscripts in the same column are significantly different at (Dunnett’ T3 test). FE: filtrate of the ethyl acetate crude extract; SA: S. aureus ATCC25923; BC: B. cereus MTCC430; nd: not determined.