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Special Issue "Recent Research Advances in Essential Oils: From Green Extraction and Synthesis to Sustainable Applications and Utilization"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: 31 December 2019

Special Issue Editors

Guest Editor
Dr. Valtcho Jeliazkov

Department of Crop and Soil Science, 431A Crop Science Building, 3050 SW Campus Way, Oregon, State University, Corvallis, OR 97331, United States
Website | E-Mail
Interests: bioactive compounds; biopesticides; scanning electron microscopy; heavy metals in soil-plant system; organic food production
Guest Editor
Prof. Dr. Murray B Isman

Faculty of Land and Food Systems, 248-2357 Main Mall, Vancouver, Canada
Website | E-Mail
Phone: 1-604-822-2329
Interests: entomology and toxicology
Guest Editor
Prof. Dr. Farid Chemat

Université d´Avignon et des Pays du Vaucluse, France
Website | E-Mail
Phone: 0033490144465
Guest Editor
Prof. Dr. Vassya Bankova

Bulgarian Academy of Science, Institute of Organic Chemistry with Centre of Phytochemistry, Acad. G. Bonchev Street, Bl. 9, 1113 Sofia, Bulgaria
Website | E-Mail
Phone: ++359 2 9606 149
Guest Editor
Prof. Dr. Niko Radulović

Department of Chemistry, Faculty of Science and Mathematics, University of Niš, Serbia
Website | E-Mail

Special Issue Information

Dear Colleagues,

Plant natural products or secondary metabolites include essential (volatile) oils (EOs). The EO components are produced by plants in order to protect them from pathogenic bacteria, fungi and viruses, as well as to repel herbivores and act as insecticides against herbivorous insects. The role of EOs as allelochemicals determines their pronounced biological activity.

Interest in EOs is increasing, as they are economically important, and are preferred by consumers as flavor and fragrance materials over synthetic chemicals. EO utilization is expanding rapidly in different areas such as alternatives to synthetic plant hormones and growth regulators, as biopesticides, as agents to reduce methane production in ruminant animals and overall anthropogenic greenhouse production, and the development of new drugs and products. This Special Issue will provide some of the recent knowledge and discoveries in the area of EO production, extraction, phytochemistry, and utilization. Consumer preferences towards natural products vs synthetics are driving the production and utilization of EOs. In the last decade, another trend, 'ethical consumerism', has expanded in scope and scale and has become mainstream. This originally environmentally-related behavior now encompasses issues of human health, animal welfare, human rights, country of origin, fair trade, and others. This is a way for consumers to try to avoid corporate practices of which they disapprove, through their choice of various products. Consumers are also willing to absorb the price of more natural and ethically-produced goods. 

Global production and trade in EOs as flavors and fragrances in foods and beverages, as fragrances in household products, and for aromatherapy have made many of these materials widely available at modest cost. The exemption of certain EOs and their major constituents from registration by the US EPA facilitated their commercialization as pesticides, and the use of such products has now expanded into Latin America and the EU. Prolific research on the use of EOs as alternatives to plant growth hormones and pesticides should lead to the use of many such oils from various sources and regions in years to come.

This Special Issue will focus on “Recent advances in EOs: From green extraction and synthesis to sustainable applications and utilization”.

Dr. Valtcho Jeliazkov
Dr. Murray Isman
Prof. Dr. Farid Chemat
Prof. Dr. Vassya Bankova
Prof. Dr. Niko Radulović
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Volatile oils
  • Green chemistry
  • Innovative extraction
  • Dual utilization
  • Biopesticides
  • EOS as growth regulators

Published Papers (3 papers)

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Research

Open AccessArticle
Hydrodistillation Extraction Kinetics Regression Models for Essential Oil Yield and Composition in Juniperus virginiana, J. excelsa, and J. sabina
Molecules 2019, 24(5), 986; https://doi.org/10.3390/molecules24050986
Received: 14 February 2019 / Revised: 2 March 2019 / Accepted: 7 March 2019 / Published: 11 March 2019
PDF Full-text (2271 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The chemical profile and antioxidant capacity of Juniperus virginiana, J. excelsa, and J. sabina essential oil (EO) fractions as a function of time was the subject of this study. The hypothesis was that, capturing EO in sequential timeframes during hydrodistillation would [...] Read more.
The chemical profile and antioxidant capacity of Juniperus virginiana, J. excelsa, and J. sabina essential oil (EO) fractions as a function of time was the subject of this study. The hypothesis was that, capturing EO in sequential timeframes during hydrodistillation would generate fractions containing unique compositions and antioxidant capacity. In J. virginiana, the highest limonene (43%) was found in the 0–5 min oil fraction, with safrole (37%) being highest in the 10–20 and 20–40 min fractions, and elemol (34%) being highest in the 160–240 min fraction. In J. excelsa, α-pinene (34-36%) was the highest in the 0–5 min fraction and in the control (non-stop 0–240 min distillation) oil, limonene (39%) was the highest in the 0–10 min fractions and cedrol (50-53%) was the highest in the 40–240 min fractions. In J. sabina, sabinene (80%) was highest in the 0–3 min fraction. The highest antioxidant capacity of J. virginiana was demonstrated by the 5–10 min fraction; the one in J. sabina by the 3–10 min fraction; and, the one in J. excelsa, by the control. The kinetics regression models that were developed can predict EO composition of the three juniper species eluted at different timeframes. Various industries could benefit from the results from this study. Full article
Figures

Figure 1

Open AccessCommunication
Chemical Composition and Antimicrobial Activity of Laurus nobilis L. Essential Oils from Bulgaria
Molecules 2019, 24(4), 804; https://doi.org/10.3390/molecules24040804
Received: 25 January 2019 / Revised: 13 February 2019 / Accepted: 16 February 2019 / Published: 22 February 2019
PDF Full-text (1045 KB) | HTML Full-text | XML Full-text
Abstract
Laurel, Laurus nobilis L. is an evergreen plant belonging to the Lauraceae family, native to Southern Europe and the Mediterranean area. This is the first report on the composition and bioactivity of laurel essential oil (EO) from Bulgaria. The oil yield was 0.78%, [...] Read more.
Laurel, Laurus nobilis L. is an evergreen plant belonging to the Lauraceae family, native to Southern Europe and the Mediterranean area. This is the first report on the composition and bioactivity of laurel essential oil (EO) from Bulgaria. The oil yield was 0.78%, 0.80%, and 3.25% in the fruits, twigs, and leaves, respectively. The main constituents in the fruit EO were 1,8-cineole (33.3%), α-terpinyl acetate (10.3%), α-pinene (11.0%), β-elemene (7.5%), sabinene (6.3%), β-phellandrene (5.2%), bornyl acetate (4.4%), and camphene (4.3%); those in the twig EO were 1,8-cineole (48.5%), α-terpinyl acetate (13.1%), methyl eugenol (6.6%), β-linalool (3.8%), β-pinene (3.4%), sabinene (3.3%) and terpinene-4-ol (3.3%); and the ones in the leaf EO were 1,8-cineole (41.0%), α-terpinyl acetate (14.4%), sabinene (8.8%), methyl eugenole (6.0%), β-linalool (4.9%), and α-terpineol (3.1%). The antibacterial and antifungal properties of laurel EOs were examined according to the agar well diffusion method. The leaf EO showed antibacterial and antifungal activities against almost all strains of the microorganisms tested, whereas the twig EO was only able to inhibit Staphylococcus aureus. Pseudomonas aeruginosa ATCC 9027 and Escherichia coli ATCC 8739 were the bacterial strains that showed the highest resistance to the laurel EO. The results can benefit the EO industry and biopesticide development. Full article
Figures

Figure 1

Open AccessCommunication
Chemical Composition of the Essential Oil of the Endemic Species Micromeria frivaldszkyana (Degen) Velen.
Molecules 2019, 24(3), 440; https://doi.org/10.3390/molecules24030440
Received: 9 January 2019 / Revised: 24 January 2019 / Accepted: 25 January 2019 / Published: 26 January 2019
PDF Full-text (242 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Micromeria frivaldszkyana is an endemic species found only in Bulgaria. Its essential oil (EO) composition is unknown. This study assessed the EO yield and composition of M. frivaldszkyana as a function of the location and of drying prior to the EO extraction. M. [...] Read more.
Micromeria frivaldszkyana is an endemic species found only in Bulgaria. Its essential oil (EO) composition is unknown. This study assessed the EO yield and composition of M. frivaldszkyana as a function of the location and of drying prior to the EO extraction. M. frivaldszkyana was sampled from two natural habitats, Uzana and Shipka in the Balkan Mountains; the EO was extracted via hydrodistillation and analyzed on GC/MS. The plants from the two locations had distinct EO composition. The EO content (in dried material) was 0.18% (Uzana) and 0.26% (Shipka). Monoterpene ketones were the major group of the EO constituents. Also, hydrocarbons predominated in the EO from Shipka, and alcohols predominated in the EO from Uzana. The EO from Uzana had a greater concentration of menthone (56% vs. 17% from Shipka) and neomenthol (7.8% vs. 2.4%). Conversely, the EO from Shipka had greater concentrations of pulegone (50% vs. 20% from Uzana), limonene (10.1% vs. 2.6%), and germacrene D (3.4% vs. 1.1%). Drying prior to the EO extraction altered the concentration of some constituents. This is the first report of M. frivaldszkyana EO yield and composition. The EO showed some similarities with the chemical profile of other Micromeria species, but overall, it has an unique chemical profile and may have distinctive applications. Full article
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