Phytochemical Composition and Antibacterial Activity of Hydroalcoholic Extracts of Pterospartum tridentatum and Mentha pulegium against Staphylococcus aureus Isolates

Table 4

Minimum inhibitory concentration (MIC) of P. tridentatum and M. pulegium aqueous and methanolic extracts expressed as .

Isolate	Reference	Type	Gentamicin (commercial antibiotic)	P. tridentatum	M. pulegium
S. aureus	ATCC 13565	Standard	<39 (+++)	312.5 (++)	2500 (−)
S. aureus	MJMC021	MRSA	<39 (+++)	78.1 (+++)	2500 (−)
S. aureus	MJMC024	MRSA	<39 (+++)	78.1 (+++)	2500 (−)
S. aureus	MJMC026	MRSA	<39 (+++)	78.1 (+++)	2500 (−)
S. aureus	MJMC025	MSSA	<39 (+++)	39.1 (+++)	39.1 (+++)
S. aureus	MJMC027	MSSA	<39 (+++)	39.1 (+++)	78.1 (+++)
S. aureus	MJMC029	MSSA	<39 (+++)	39.1 (+++)	39.1 (+++)

Inside brackets there is the classification of the antibacterial activity effect: strong (+++), if MIC values ≤ 100 μg⋅mL⁻¹, moderate (++) when 100 < MIC ≤ 500 μg⋅mL⁻¹, weak (+) when 500 < MIC ≤ 1000 μg⋅mL⁻¹, and null (−) (without effect) when MIC > 1000 μg⋅mL⁻¹.