Chemical Compositions of the Volatile Oils and Antibacterial Screening of Solvent Extract from Downy Lavender

Abstract

The discovery of a new species exhibiting more effective antibacterial properties is necessary because of the demand on Lavandula species, which continues to increase in a variety of industries. Lavandula pubescens might be a good alternative, as it exhibits strong antibacterial activity. In this study, the chemical composition of the essential oils from different organs (flowers, leaves, stems, and roots) of L. pubescens was identified using gas chromatography-mass spectrometry. Furthermore, the antimicrobial activities of different solvent extracts (methanol, ethanol, diethyl ether, hexane, and ethyl acetate) and different organ (flower, leaf, stem, and root) extracts of L. pubescens were evaluated. Only the ethyl acetate extracts of L. pubescens exhibited antibacterial activity against all bacterial strains tested, including Staphylococcus haemolyticus, Escherichia coli (KF 918342), Aeromonas hydrophila (KCTC 12487), E. coli (ATCC 35150), Cronobacter sakazakii (ATCC 29544), and Aeromonas salmonicida (KACC 15136). In particular, the extracts exhibited significant activity against S. haemolyticus. Ethyl acetate extract of the leaf exhibited the best activity against all bacterial strains. This study provides valuable information on the chemical compositions in essential oils and antimicrobial properties of L. pubescens.

Liquid and Vapour Phase of Lavandin (Lavandula × intermedia) Essential Oil: Chemical Composition and Antimicrobial Activity

“…Different biological activities were found in common lavender and lavandin EOs such as anxiolytic, antioxidant, anti-inflammatory, antidepressant, analgesic, smooth-muscle relaxant, anti-parasitic, anticancer, and apoptosis induction activity, as well as having beneficial immunomodulatory effects on wound healing [14,15,16,17,18,19,20,21]. Moreover, it was reported that the EOs obtained from Lavandula are active on many types of bacteria such as foodborne pathogens, human pathogenic bacteria, and environmental bacteria [22,23,24,25,26,27]. Furthermore, Lavandula × intermedia and Lavandula Angustifolia essential oils, rich in specific constituents such as linalool, camphor, and 1,8-cineole, possess antibacterial activities against Listeria monocytogenes, especially against isolates from a clinical environment [28].…”

Downy Lavender Oil: A Promising Source of Antimicrobial, Antiobesity, and Anti‐Alzheimer’s Disease Agents

“…ere are no reports on the EO composition of L. pubescens growing wild in Palestine and only a few such reports are available worldwide [6,8,13,31]. Hydrodistillation of the L. pubescens leaves yielded 1.9 mL per 250 g fresh plant material.…”

“…e oil has also been utilized for relieving anxiety and associated sleep disorders [10], depression, and headache [11]. e EO of Lavandula species is also used widely in pharmaceutical fragrance, food, and household cleaners [12][13][14].…”

“…e EO of L. pubescens has been reported to exhibit a strong wide-ranging in vitro antibacterial activity against Gram-positive and Gram-negative bacteria including Salmonella enterica, Staphylococcus aureus, Micrococcus luteus, Enterococcus faecalis, and Escherichia coli [6,13,15] and hepatoprotective [16], cytotoxic, and xanthine-oxidase inhibitory activities [6,8].…”

Essential oil of Alchornea laxiflora (benth): phytochemical, antimicrobial and toxicity evaluations

“…A myriad of biological activities has been attributed to essential oils extracted from the flowers, leaves, stems, and roots of aromatic plants. Specifically leaf-derived essential have been studied for antibacterial [4,5], antioxidant [6,7], antifungal [8], anti-diabetic [9], anti-cancer [10,11] ; anti-parasitic [12,13], anti-aging [14], anti-inflammatory [15] and hepatoprotective [16,17] effects. The components and functional groups of the essential oils contribute to their bio-activities.…”