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Table 2 Minimal inhibitory concentration (MIC) of C. khasianus essential oil (CKEO) and streptomycin alone and in combinations against E. coli

From: Antimicrobial activities and mechanism of action of Cymbopogon khasianus (Munro ex Hackel) Bor essential oil

Strain   MIC (alone) MIC (μg/mL) combination Fold reduction Fractional inhibitory concentration index (FICI) Result
E. coli Streptomycin 0.011 0.0007 16 0 .316 Synergy
CKEO 20 5 4
Ciprofloxacin 0.1875 0.0937 2 0.531 Partial Synergy
CKEO 20 0.625 32