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Table 3 Minimal inhibitory concentration (MIC) of the studied plants extracts and chloramphenicol on the studied bacterial species

From: Antibacterial and antibiotic-potentiation activities of the methanol extract of some cameroonian spices against Gram-negative multi-drug resistant phenotypes

Bacterial strains Tested samples and MIC in μg/ml in the absence and presence of PAßN (in parenthesis)
  Aframomum citratum Aframomum melegueta Imperata cylindricum Cinnamomum zeylanicum Dorstenia psilurus Fagara leprieuri Monodora myristica Pentadiplandra brazzeana Piper guineense Scorodophloeus zenkeri Tetrapleura tetraptera CHL
E. coli             
ATCC8739 512 512 512 64 - 512 1024 1024 1024 1024 1024 1
ATCC10536 1024 512 1024 512 128 256 1024 512 1024 512 1024 (1024) 32 (<2)
AG100 1024 (1024) 1024 (1024) 1024 (256) - (64) - (1024) 1024 (1024) 512 1024 (1024) 1024 (512) 1024 (1024) 1024 (1024) 4 (<2)
AG100A 512 (128) 1024 (1024) 1024 (128) 512 (128) 512 (128) 512 (512) 1024 (1024) - (−) 1024 (1024) 1024 (1024) 1024 (1024) <2 (<2)
AG100ATET 512 (512) 1024 (1024) 1024 (1024) 512 (512) 512 (128) 1024 (1024) - - 1024 512 1024 32 (<2)
AG102 1024 - 1024 1024 512 1024 - - - - - 16 (<2)
MC4100 512 (512) 512 (256) 1024 (1024) 1024 (1024) 512 (256) 512 - (−) 1024 (1024) 1024 (1024) 1024 (1024) 512 (512) 4 (<2)
W3110 512 (256) 512 (512) 512 (512) 512 (512) 512 (256) 256 512 1024 (1024) 1024 (128) 512 512 (512) 1 (<2)
E. aerogenes             
ATCC13048 1024 - 1024 1024 1024 1024 1024 - - - - 8 (<2)
CM64 1024 (1024) 1024 (1024) 512 (128) 1024 (512) 512 (256) 1024 (1024) 1024 (1024) 1024 (1024) 1024 (1024) 1024 (1024) 512 (512) 32
EA27 512 (512) 1024 (1024) 512 (512) 512 (512) - (−) 1024 (1024) 1024 (1024) 1024 (1024) -(−) 1024 (1024) 1024 (512) 64 (32)
EA289 - 1024 - 1024 - - 1024 1024 - - 1024 256
EA298 1024 512 - - 1024 - 256 256 512 256 1024 256
EA3 - - - - - 1024 - - - - - 256
E. cloacae             
BM47 512 (512) 1024 (1024) 1024 (1024) 1024 (512) 1024 (128) 1024 (1024) 1024 (1024) 1024 1024 1024 1024 - (8)
BM67 512 (512) 1024 (1024) 1024 (1024) 1024 (1024) 1024 (128) - (−) - (−) - (−) - (−) - (−) - (−) - (32)
ECCI69 512 (512) 1024 (1024) 1024 (1024) 1024 (1024) -(−) -(−) 1024 (1024) - (−) 1024 (1024) 1024 (1024) 1024 (512) - (32)
K. pneumoniae             
ATCC12296 1024 1024 1024 1024 1024 1024 512 - - - 1024 4
K2 1024 - 1024 1024 1024 - 1024 - - - - -
K24 1024 1024 1024 1024 1024 1024 512 - - 1024 1024 32 (<2)
KP55 512 1024 256 512 512 1024 1024 - - - 1024 32(<2)
KP63 512 (512) 1024 (1024) 1024 (1024) 512 (512) 512 (128) 1024 (512) 1024 (1024) 512 1024 (1024) 1024 (512) 1024 (1024) 64(<2)
P. stuartuii             
ATCC29916 1024 (1024) - (−) -(−) -(−) 1024 (1024) -(−) -(−) -(−) 1024 (1024) 1024 (1024) 1024 (1024) 8
NEA16 1024 (512) - (−) 1024 (1024) 512 (512) 512 (256) 1024 1024 - - 1024 - 64(<2)
PS2636 1024 - - - - - - - - - - -
PS299645 512 512 1024 1024 1024 1024 - 1024 1024 512 1024 128
P. aeruginosa             
PA01 - - - - - - - - - - - -
PA124 - - - - - - - - - 1024 - 32(<2)
  1. (−): MIC not detected at up to 1024 μg/ml for the les extracts and 256 μg/ml for chloramphenicol. () : values in parenthesis are MIC of substance in the presence of PAßN at 20 μg/ml. The MIC of PAßN was 64 μg/ml on E. coli. AG100A. 512 μg/ml on ATCC11296. BM67. EA27. EA289; 1024 μg/ml on AG100ATET. ATCC13048. CM64; and > 1024 μg/ml on other bacteria. CHL: chloramphénicol; (in bold): significant MIC value.