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Table 1 Minimum inhibitory concentration of different crude extracts of Costus speciosus rhizome against selected bacteria and fungi

From: Antimicrobial activity of sesquiterpene lactones isolated from traditional medicinal plant, Costus speciosus (Koen ex.Retz.) Sm

Tested organisms Minimum inhibitory concentration (mg/ml)
Bacteria He Ch E.a Me W
Staphylococcus aureus 1.25 0.625 1.25 0.625 > 5
Staphylococcus epidermidis 0.625 0.312 5 0.625 > 5
Bacillus subtilis 1.25 > 5 > 5 1.25 > 5
Fungi Minimum inhibitory concentration (μg/ml)
Trichophyton mentagrophytes 0.62 1000 0.62 1000 1000
Epidermophyton floccosum 0.62 1000 0.62 0.125 1000
Trichophyton simii 0.62 > 1000 0.62 1000 > 1000
Trichophyton rubrum 296 0.62 1000 0.125 500 1000
Trichophyton rubrum 57/01 0.125 500 0.125 0.125 1000
Curvularia lunata 500 1000 0.250 > 1000 > 1000
Aspergillus niger 500 > 1000 > 1000 > 1000 > 1000
Botrytis cinerea 1000 > 1000 > 1000 > 1000 > 1000
Scopulariopsis sp. 500 > 1000 > 1000 500 > 1000
Magnaporthe grisea 0.125 > 1000 1000 > 1000 > 1000
Candida albicans > 1000 > 1000 > 1000 > 1000 > 1000
  1. He-Hexane extract; Ch-Chloroform extract; E.a-Ethyl acetate extract; Me -Methanol extract; W-Water extract