Abstract
Introduction: Essential oils from natural plants are widely use around the world to relief mental conditions. The aim of this investigation was to determine the anxiolytic-like effect of essential oils extracted from Lippia alba and Lippia citriodora. Methods: The oil was extracted by hydro-distillation for 3 hours using a modified Clevenger-type apparatus and then chemical composition was investigated by gas chromatography analysis (GC) and gas chromatography-mass spectrometry (GC-MS). Moreover, a randomized experimental trial was conducted, where 95 participants were divided into 3 groups, comprising a waiting list control group and two experimental groups treated with essential oils by inhalation. The anxiety index was evaluated by State-Trait Anxiety Inventory (STAI). Measures were taken two times: pretest and posttest. Results: chemical analysis showed that carvone was the main component (64.5%) for Lippia alba essential oil and geranial (39.8%) for Lippia citriodora. State and Trait anxiety scores showed a decrease in posttest study phase in comparison with pretest in all experimental groups (p<0.05). Cohen's D and Hedges’ G scores show a large size effect in state anxiety for experimental group treated with Lippia alba while moderate changes were found for the rest of variables in all experimental groups. Conclusion: the essential oils extracted from Lippia alba and Lippia citriodora may be useful as a mean to counteract anxiety, specifically state anxiety showing short-terms benefits.
Highlights
Essential oils from natural plants are widely use around the world to relief mental conditions
The oil was extracted by hydro-distillation for 3 hours using a modified Clevenger-type apparatus and chemical composition was investigated by gas chromatography analysis (GC) and gas chromatography-mass spectrometry (GC-MS)
A randomized experimental trial was conducted, where 95 participants were divided into 3 groups, comprising a waiting list control group and two experimental groups treated with essential oils by inhalation
Summary
Essential oils from natural plants are widely use around the world to relief mental conditions. The aim of this investigation was to determine the anxiolytic-like effect of essential oils extracted from Lippia alba and Lippia citriodora. Conclusion: the essential oils extracted from Lippia alba and Lippia citriodora may be useful as a mean to counteract anxiety, state anxiety showing short-terms benefits. There is a growing acceptation for Complementary and Alternative Medicine (CAM) treatments, since are perceived as natural, lowrisk, economical, with fewer side effects and as effective as conventional drugs[9] In this context, aromatherapy employs essential oils (EOs), secondary metabolites mainly extracted from leaves, flowers, rhizomes, seeds, barks, and resins of aromatic plants[10]
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