Abstract

AbstractThe emergence of resistance for antipedicular agents and the need of potent acetylcholinesterase (AChE) therapeutics for the treatment of a neurodegenerative disorder such as Alzheimer disease has led researchers to the exploration of new therapeutic alternatives such as natural volatile oils. Therefore, the current investigation aimed to identify the components of Satureja capitata L. volatile oil (VO), and examine the VO anticholinesterase, and antipedicular activities. The plant phytoconstituents were identified using Gas chromatography mass spectrometry (GC-MS) method, while the anticholinesterase activity was determined against butyryl- and acetyl-cholinesterase using Ellman’s method. In addition, antipedicular activity was established using the diffusion method. The obtained GC-MS results identified 16 compounds in S. capitata VO with the major constituents being carvacrol, γ-terpinene, and p-cymene. Anticholinesterase analysis showed a marked inhibition potential against acetyl- and butyryl-cholinesterase enzymes with half maximal inhibitory concentration (IC50) values of 28.24±0.97 μg/ml and 92.31±1.22 μg/ml, respectively in comparison with the reference compound galantamine, which has IC50 values against the same enzymes of 5.21±0.07 μg/ml and 10.33±0.37 μg/ml, respectively. In addition, the VO, at a concentration of 20%, was effective against head lice, similar to benzyl benzoate, which resulted in 100% mortality. In addition, the VO completely inhibited the emergence of lice nits after 6 and 14 days. On the basis of the obtained results, S. capitata VO is a promising natural alternative to synthetic antipedicular and anticholinesterase drugs, which can be employed in drug development, and may lead to new candidates against head lice and neurodegenerative diseases.

Highlights

  • Since ancient times, plants and other natural products have been traditionally employed as therapeutic agents [1]

  • The current investigation aimed to identify the components of Satureja capitata L. volatile oil (VO), and examine the VO anticholinesterase, and antipedicular activities

  • On the basis of the obtained results, S. capitata VO is a promising natural alternative to synthetic antipedicular and anticholinesterase drugs, which can be employed in drug development, and may lead to new candidates against head lice and neurodegenerative diseases

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Summary

Introduction

Plants and other natural products have been traditionally employed as therapeutic agents [1]. VOs are considered secondary metabolic products, which are composed of a complex mixture of aromatic compounds produced in various plant parts such as flowers, leaves, barks, roots, seeds, and fruits [3]. Satureja capitata (L.) Cav., which belongs to the Lamiaceae family, is an aromatic perennial shrubby herbaceous plant that is widely distributed in the mountains of Palestine and other Mediterranean basin countries. It is commonly used as a food and medicine due to its nutrient and therapeutic effects [5, 8]. It is utilized in Arabian traditional medicine for the treatment of cold symptoms, throat infections and in low doses it is utilized to boost mood and to improve cognition

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