Table 2.

Inhibitory zones (ZOI), minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) of Pithecellobium dulce seed extract towards Gram-positive and Gram-negative clinical bacterial strains.

Bacterial strain	ZOI ceftriaxone (mm)	ZOI extract (mm)	MIC [mg/mL (extract)] ± SD∗	MBC [mg/mL(extract)] ± SD∗	MBC/MIC ratio
Methicillin-resistant Staphylococcus aureus [UNI 001]	14	10	300	600	2
Staphylococcus aureus [UNI 217]	16	9	300	600	2
Staphylococcus aureus [UNI 211]	27	11	300	600	2
Staphylococcus aureus [UNI 22]	30	10	300	600	2
Escherichia coli [UNI001]	11	9	300	750	2.5
Acinetobacter baumannii [UNI002]	0	9	233 ± 115	600	2.6

Determined minimal inhibitory concentration expressed as the mean of three replicates (mg/mL ± SD). SD: standard deviation ^∗ zero SD means that three replicates give the same MIC or MBC; mm: millimetre.