Journal
CHEMISTRY & BIODIVERSITY
Volume 14, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbdv.201700189
Keywords
Houttuynia cordata; Season; Plant parts; Essential-oil composition; Antimicrobial activity; Phytotoxic activity
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Fish-mint (Houttuynia cordata THUNB.), belonging to family Saururaceae, has long been used as food and traditional herbal medicine. The present study was framed to assess the changes occurring in the essential-oil composition of H. cordata during annual growth and to evaluate allelopathic, antibacterial, antifungal, and antiacetylcholinesterase activities. The essential-oil content ranged from 0.06 - 0.14% and 0.08 - 0.16% in aerial parts and underground stem, respectively. The essential oils were analysed by GC-FID, GC/MS, and NMR (H-1 and C-13). Major constituents of aerial-parts oil was 2-undecanone (19.4 - 56.3%), myrcene (2.6 - 44.3%), ethyl decanoate (0.0 - 10.6%), ethyl dodecanoate (1.1 - 8.6%), 2-tridecanone (0.5 - 8.3%), and decanal (1.1 - 6.9%). However, major constituents of underground-stem oil were 2-undecanone (29.5 - 42.3%), myrcene (14.4 - 20.8%), sabinene (6.0 - 11.1%), 2-tridecanone (1.8 - 10.5%), beta-pinene (5.3 - 10.0%), and ethyl dodecanoate (0.8 - 7.3%). Cluster analysis revealed that essential-oil composition varied substantially due to the plant parts and season of collection. The oils exhibited significant allelopathic (inhibition: 77.8 - 88.8%; LD50: 2.45 -3.05 mu l/plate), antibacterial (MIC: 0.52 - 2.08 mu l/ml; MBC: bacteriostatic) and antifungal (MIC: 2.08 - 33.33 mu l/ml; MFC: 4.16 - 33.33 mu l/ml) activities. The results indicate that the essential oil from H. cordata has a significant potential to allow future exploration and exploitation as a natural antimicrobial and allelopathic agent.
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