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Natural Product Research
Formerly Natural Product Letters
Volume 30, 2016 - Issue 24
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Research Articles

Novel illudalane sesquiterpenes from Encephalartos villosus Lehm. antimicrobial activity

Pages 2791-2797 | Received 07 Nov 2015, Accepted 14 Feb 2016, Published online: 24 Mar 2016
 

Abstract

Phytochemical investigation of Encephalartos villosus Lehm. leaves afford two new illudalane sesquiterpenes namely Encephaldiene 1 and Encephaldiene 2 together with four known flavone glycosides, Luteolin-7-rutinoside, Luteolin-7-glucoside, Luteolin-7-rhamnoside and Apigenin-7-glucoside. The structures of the isolated compounds were elucidated by means of spectroscopic methods including 1D and 2D NMR experiments along with HRESIMS spectrometry. Antimicrobial activity of CHCl3 and MeOH extracts was investigated. Both extracts showed antibacterial activity against Gram-positive bacteria Streptococcus pneumonia and Bacillus subtilis, and antifungal activity against Aspergillus fumigatus. While CHCl3 extract showed additional activity against Gram-negative bacteria Escherichia coli.

Acknowledgement

The authors would like to thank the Regional Center of Mycology and Biotechnology for antimicrobial tests.

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