Essential Oils: Sources, Chemical Composition and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: 20 April 2024 | Viewed by 673

Special Issue Editors

Department of Chemical Engineering, Faculty of Sciences, University of Granada, 18071 Granada, Spain
Interests: chemical engineering; cleaning; enzymes; surfactant; essential oils
Special Issues, Collections and Topics in MDPI journals
Department of Chemical Engineering, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain
Interests: chemical engineering; cleaning; enzymes; surfactant; essential oils
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Essential oils are a mixture of volatile compounds such as monoterpenes, such as limonene, alpha-pinene and linalool; sesquiterpenes, such as beta-caryophyllene and germacrene; alcohols; esters; ketones; and phenols, such as thymol and carvacrol. They are extracted from plants such as oregano, thyme, citrus, eucalyptus, rose geranium, rosemary, garlic, cloves and others. Their chemical composition can vary greatly depending on the plant or extraction method, such as steam distillation, cold pressing, or solvent extraction.

Research on essential oils has focused on their chemical characterization, biological activity and mode of action using advanced analytical techniques, such as gas chromatography–mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) spectroscopy, to identify and quantify the chemical constituents of essential oils.

They are used in a wide range of applications, such as perfumery, cosmetics, food flavouring and traditional medicine. In recent years, interest in essential oils and their application in food preservation has grown due to the increasingly negative consumer perception of synthetic preservatives as they come from renewable sources. Recent studies have also explored the potential due to their biological activities, including antimicrobial, anti-inflammatory, antioxidant, and insecticidal properties. There is also growing interest in the use of essential oils as disinfecting agents in cleaning-related products. However, further research is needed to understand the mechanisms of action and to optimize their use in different applications.

For this Special Issue, papers concerning the identification of new sources of essential oils; the development and optimisation of more efficient methods for the extraction of essential oils from plant sources, including steam distillation, solvent extraction and supercritical fluid extraction; experimental techniques that allow more accurate characterization of essential oils; optimization and new methods for quality control and sustainable production; and, above all, different applications in which essential oils can be used.

Dr. Jose Maria Vicaria
Prof. Dr. Encarnación Jurado Alameda
Guest Editors

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Keywords

  • essential oils
  • composition
  • characterization
  • applications
  • disinfection

Published Papers (1 paper)

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Research

10 pages, 1661 KiB  
Article
Isolation of Geranyl Acetate and Chemical Analysis of the Essential Oil from Melaleuca armillaris (Sol. ex Gaertn.) Sm.
Appl. Sci. 2024, 14(5), 1864; https://doi.org/10.3390/app14051864 - 24 Feb 2024
Viewed by 339
Abstract
A method was developed for the isolation of geranyl acetate from the crude essential oil (EO) of Melaleuca armillaris (Sol. ex Gaertn.) Sm. leaves, and the purity of the isolated compound was analyzed by GC/MS spectral and NMR analysis and was found to [...] Read more.
A method was developed for the isolation of geranyl acetate from the crude essential oil (EO) of Melaleuca armillaris (Sol. ex Gaertn.) Sm. leaves, and the purity of the isolated compound was analyzed by GC/MS spectral and NMR analysis and was found to have high purity (98.9%). In addition, the EO isolated presented 0.907 g/cm3, 1.474 and [α]D20=17.6 of density, refraction index and optical rotation, respectively. The chemical composition of the EO obtained for steam distillation from M. armillaris was analyzed by gas chromatographic and spectroscopic techniques (GC/MS and GC/FID). Thirty-eight compounds were identified, representing 99.92% of the total EO analyzed on a DB-5 ms (5% phenylmethylpolysiloxane) capillary column. This analysis showed that the EO consisted mainly of oxygenated monoterpenes (77.01%), followed by monoterpene hydrocarbons (21.31%) and sesquiterpene hydrocarbons (1.31%). Furthermore, the essential oil of M. armillaris was rich in 1,8-cineol (67 ± 2%), followed by limonene (10 ± 1%), α-Terpineol (9 ± 1%) and α-Pinene (5 ± 1%). Finally, the results suggest that the geranyl acetate isolated with high purity from crude essential oil is recommended to be explored as a component in medicinal or industrial use. Full article
(This article belongs to the Special Issue Essential Oils: Sources, Chemical Composition and Applications)
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