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Open AccessFeature PaperArticle

Essential Oil Yield and Composition of the Balkan Endemic Satureja pilosa Velen. (Lamiaceae)

1
Department of Botany and Agrometeorology, Agricultural University, Mendeleev 12, 4000 Plovdiv, Bulgaria
2
Crop and Soil Science Department, Oregon State University, 3050 SW Campus Way, 109 Crop Science Building, Corvallis, OR 97331, USA
3
Natural Products Utilization Research Unit, USDA-ARS, University, MS 38677, USA
4
Faculty of Agriculture, Dalhousie University, PO Box 550, Truro, NS B2N 5E3, Canada
5
National Center for Natural Products Research, The University of Mississippi, University, MS 38677, USA
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(4), 827; https://doi.org/10.3390/molecules25040827 (registering DOI)
Received: 17 January 2020 / Revised: 9 February 2020 / Accepted: 10 February 2020 / Published: 13 February 2020
Satureja pilosa Velen. senso lato is a Balkan endemic plant that is not well characterized and is found on rocky outcrops of limestone base in Stara Planina (the Balkan Mountains) and the Rhodope Mountains. The objective of this study was to assess the variability of essential oil (EO) content and composition of S. pilosa collected at 33 locations across the Balkan and Rhodope Mountains in Bulgaria using advanced statistical methods including cluster analysis. The EO content in dried aboveground biomass varied from 0.52% to 2.03%. More than 21 EO constituents were identified, belonging to the groups of monoterpenes and sesquiterpenes. The monoterpenes were the predominant class, comprising 84.8% to 96.1% of the total EO. Thymol and carvacrol were the major constituents of the phenolic monoterpenoids. Thymol varied from 36.6% to 67.1% and carvacrol varied from 52.4% to 93.0% of the total oil. p-Cymene also varied widely, from 9.6%–34.0%. There were significant variations between locations and within a location in the EO content and composition. This study identified several chemotypes: (1) thymol and p-cymene; (2) thymol, p-cymene and γ-terpinene; (3) carvacrol and p-cymene; (4) carvacrol, p-cymene and γ-terpinene; and (5) carvacrol. This is the first comprehensive study on the endemic plant S. pilosa that identified several chemotypes based on the EO composition. The S. pilosa EO from the five different chemotypes exhibited larvicidal and mosquito repellent activity against Aedes aegypti. The identified chemotypes can be utilized for the development of new varieties with desirable compositions to meet specific industry needs and new mosquito management control products.
Keywords: Balkan endemic; savory; monoterpenes; thymol; carvacrol; chemotype; mosquitoes; biting deterrence Balkan endemic; savory; monoterpenes; thymol; carvacrol; chemotype; mosquitoes; biting deterrence
MDPI and ACS Style

Semerdjieva, I.B.; Zheljazkov, V.D.; Cantrell, C.L.; Astatkie, T.; Ali, A. Essential Oil Yield and Composition of the Balkan Endemic Satureja pilosa Velen. (Lamiaceae). Molecules 2020, 25, 827.

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