Abstract
BackgroundMentha plants containing over 25 species are aromatic perennial herbs. These species have been interested and widely used because of various clinical findings. Many volatile compounds facilitate environmental interactions such as protecting themselves from pathogens, parasites, and herbivores. Therefore, this study assessed comparison of volatile composition and antimicrobial activity from nine Mentha species. The composition of volatiles was investigated from the aerial parts of nine different Mentha species using gas chromatography-mass spectrometry (GC/MS). In addition, screened antimicrobial activities against six food borne pathogenic bacteria using extracts obtained these plants.Results77 volatile compounds were identified in total and it included 13 monoterpenoids, 19 sesquiterpenoids, and others. In particular, monoterpenoids such as eucalyptol (9.35–62.16 %), (±)camphorquinone (1.50–51.61 %), and menthol (0.83–36.91 %) were mostly detected as major constituents in Mentha species. The ethanol extract of nine Mentha species showed higher activity compared to other solvent extracts (methanol, hexane, di ethyl ether). Among these nine Mentha species chocomint showed higher inhibition activity against all bacteria.ConclusionsIt is concluded that monoterpenoids are mainly rich in Mentha plants. Moreover, most of extracts obtained from Mentha showed strong antimicrobial activity against bacteria. Of these, chocomint indicates the highest inhibition activity.
Highlights
Mentha plants containing over 25 species are aromatic perennial herbs
Volatile constituents of nine Mentha species The identified volatile constituents in different Mentha plants are shown in Table 1. 77 volatile components were found based on comparison of the mass spectrum in total
The content of plant volatiles expressed in percentages was as follows: peppermint (M. piperita), 98.27 %; water mint (M. aquatic), 94.95 %; apple mint (M. suaveolens), 98.54 %; spearmint (M. spicata), 97.42 %; chocolate mint (M x piperita ‘Chocolate’), 99.70 %; pineapple mint (M. suaveolens ‘Variegata’), 97.02 %; horsemint (M. longifolia), 99.70 %; eau de cologne mint (M x piperita f. citrate), 97.84 %; pennyroyal mint (M. pulegium), 99.81 %
Summary
Mentha plants containing over 25 species are aromatic perennial herbs. These species have been interested and widely used because of various clinical findings. This plant with various therapeutic values such as antidiarrheal, cardiovascular, and central nervous system (CNS) effects, and antimicrobial, antioxidant, and anti-inflammatory activities has the hopeful potential as a medicinal herb (Shaikh et al 2014). Commonly lipophilic liquids with high vapor pressures, represent the largest group of natural products in plants. These compounds have multiple effects on both floral and vegetative tissues (Pichersky et al 2006). Terpenoids, as the largest and diverse class of plant secondary metabolites with many volatile constituents, are derived from two basic C5 units, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP) (McGarvey and Croteau 1995)
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