Abstract
Homalomena vietnamensis is a rare species of the Homalomena genus and only found in Middle region of Vietnam. In this study, we found 10 compounds in ethanol extracts of leaf and rhizome of H. vietnamensis, such as cadinane-4β,5α,10α-triol, oplopanone, 4-epi-oplopananol, 2α-hydroxy homalomenol A, 1β,4β,7β-Trihydroxyeudesmane, homalomentetraol, 4-acetoxyoplopananol, 5,7-diepi-2a-acetoxyoplopanone, eudesma 4β, 7α- diol-1β-fumarate), and homalomenol F, via liquid chromatography-mass spectrometry (LC/MS). Moreover, the antibacterial activity of ethanol extracts of leaf and rhizome from this species has been evaluated by disc diffusion method for the first time. The results showed that rhizome extract of could inhibit the growth of 5 tested micro-organisms, including of Bacillus cereus (28.3 ± 1.5 mm), Salmonella enteritidis (19.5 ± 1.5 mm), Staphylococcus aureus (16.3 ± 1.5 mm), Escherichia coli (14.7 ± 1.2 mm), and Pseudomonas aeruginosa (8.2 ± 0.8 mm), while the leaf extract showed antibacterial effect against Bacillus cereus (22.0 ± 2.0 mm), S. enteritidis (14.7 ± 0.6 mm), and S. aureus (12.5 ± 1.8 mm).
Highlights
Homalomena Schott is a genus of the Araceae family and comprises of 250 species growing over the world (Boyce et al, 2012)
Antibacterial activity of ethanol extracts from rhizome and leaf of H. vietnamensis was evaluated by the diameter of inhibition zone against tested bacteria (Table 3 and Figure 3)
Ethanol extract of rhizome of this species showed the antibacterial effect against 5 tested microorganisms while those from leaf inhibited the growth of 3 bacterial strains, including of B. cereus, S. enteritidis, and S. aureus
Summary
Homalomena Schott is a genus of the Araceae family and comprises of 250 species growing over the world (Boyce et al, 2012). Antimicrobial and antioxidant activities of the compounds extracted from many species of Homalomena genus have been well-documented in literature (Singh et al, 2000; Rana et al, 2009; Liliwirianis et al, 2011; Yang et al, 2016). H. aromatica oil has antibacterial activity against five common and significant pathogens such as S. aureus, E. coli, P. aeruginosa, Klebsiella pneumoniae, and Proteus vulgaris (Laishram et al, 2006). Aromatica oil has antibacterial activity against five common and significant pathogens such as S. aureus, E. coli, P. aeruginosa, Klebsiella pneumoniae, and Proteus vulgaris (Laishram et al, 2006) These data suggest the essential oil of
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