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Table 3 Minimal inhibitory concentrations (MIC), minimal bactericidal concentration (MBC) and minimal fungicidal concentration (MFC) of the essential oils of Plectranthus species (mg/mL)

From: Phytochemical analysis and evaluation of the cytotoxic, antimicrobial and antioxidant activities of essential oils from three Plectranthus species grown in Saudi Arabia

Microorganisms Activity P. cylindraceus P. asirensis P. barbatus RAa RAb
Bacteria B. subtilis MIC 0.275 0.275 0.275 7.8 NT
MBC 0.55 0.55 0.55 15.6 NT
S. mutans MIC 1.10 2.20 1.10 7.8 NT
MBC 2.20 4.40 2.20 15.6 NT
B. laterosporus MIC 0.137 0.275 0.137 3.9 NT
MBC 0.275 0.55 0.275 7.8 NT
S. typhi MIC 0.275 0.55 0.137 3.9 NT
MBC 0.55 1.10 0.275 7.8 NT
Fungi C. albicans MIC 0.55 2.20 0.55 NT 3.5
MFC 1.10 4.40 1.10 NT 7.0
C. neoformans MIC 0.275 0.275 0.275 NT 3.5
MFC 0.55 0.55 0.55 NT 7.0
  1. B. subtilis: Bacillus subtilis ATCC 6633, S. mutans: Streptococcus mutans ATCC 25175, B. laterosporus: Brevibacillus laterosporus wild strain, Salmonella typhi wild strain, C. albicans: Candida albicans ATCC 60193 and C. neoformans: Cryptococcus neoformans wild strain, RAa, Reference antibiotic (Gentamycin), RAb Reference antibiotic (Nystatin). Values are given as mg/ml for essential oils and μg/ml for standard antibiotics, NT not tested