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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