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Open Access Highly Accessed Research article

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

Veeramuthu Duraipandiyan12, Naif Abdullah Al-Harbi1, Savarimuthu Ignacimuthu2* and Chinnasamy Muthukumar1

Author Affiliations

1 Department of Botany and Microbiology, Addiriyah Chair for Environmental Studies, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia

2 Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Chennai 600 034, India

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BMC Complementary and Alternative Medicine 2012, 12:13  doi:10.1186/1472-6882-12-13

Published: 7 March 2012

Abstract

Background

Costus speciosus (Koen ex.Retz.) Sm (Costaceae) is an Indian ornamental plant which has long been used medicinally in traditional systems of medicine. The plant has been found to possess diverse pharmacological activities. Rhizomes are used to treat pneumonia, rheumatism, dropsy, urinary diseases, jaundice, skin diseases and leaves are usedto treat mental disorders.

Method

Antibacterial and antifungal activities were tested using Disc diffusion method and Minimum Inhibitory Concentration (MIC). Column chromatography was used to isolate compounds from hexane extract. X-ray crystallography technique and GC-MS analysis were used to identify the compounds

Results

Antibacterial and antifungal activities were observed in hexane, chloroform, ethyl acetate and methanol extracts. Hexane extract of C.speciosus showed good activity against tested fungi also. Two sesquiterpenoid compounds were isolated (costunolide and eremanthin) from the hexane extract. Both the compounds did not inhibit the growth of tested bacteria. But, both the compounds inhibited the tested fungi. The compound costunolide showed significant antifungal activity. The MIC values of costunolide were; 62.5 μg/ml against Trichophyton mentagrophytes, 62. μg/ml against T. simii, 31.25 μg/ml against T. rubrum 296, 62.5 μg/ml against T. rubrum 57, 125 μg/ml against Epidermophyton floccosum, 250 μg/ml against Scopulariopsis sp, 250 μg/ml against Aspergillus niger, 125 μg/ml against Curvulari lunata, 250 μg/ml against Magnaporthe grisea.

Conclusion

Hexane extract showed promising antibacterial and antifungal activity. The isolated compound costunolide showed good antifungal activity.

Keywords:
Antibacterial; Antifungal; Sesquiterpeneoids; Costus speciosus; Costunolide; Eremanthin; MIC