Abstract
Satureja myrtifolia (Boiss. & Hohen.) Greuter & Burdeta medicinal plant belonging to the Lamiaceae family was collected from south of Lebanon and hydro-distilled by Clevenger method. Essential oil composition from aerial parts was analyzed by GC-MS technique. The odor of essential oil is characteristic, and clear yellow liquid oil was obtained after hydro-distillation. The yield of the essential oil was 1.25±0.02 % of dry matter (w/w). Thirty nine volatile components were identified in the Satureja myrtifolia oil, which shows a high amount of hydrocarbons class (57.82±0.1 %). Other classes were also identified such assesquiterpene hydrocarbons (12.96±0.1 %), oxygenated sesquiterpenes (10.65±0.2 %), phenolic compounds (10.32±0.1 %), acids (5.53±0.1 %), and monoterpenes hydrocarbons (2.21±0.1 %).In addition, a comparison with the unique study performed on Satureja myrtifolia was also carried out.
Highlights
High resolution mass spectrometry (HRMS) is being used increasingly in the context of suspect and non-targeted screening for the identification of bioorganic molecules
Examples are the many lists on the Network of reference laboratories (NORMAN) Suspect List Exchange [41] and the corresponding merged database SusDat [43], the CompTox Chemicals Dashboard [42] and a series of topical databases from the Wishart laboratory and collaborators (e.g., Human Metabolome Database (HMDB) [28, 30], DrugBank [44], the Toxin and Toxin Target Database (T3DB) or Toxic Exposome Database (TEDB) [45] and the Exposome Explorer database [46])
As several reviews have covered the number of overlapping substances in tandem mass spectral libraries in various contexts recently [16, 17, 54], the focus here will be on substances of interest for the environmental and biomonitoring contexts, using the resources mentioned
Summary
This article first explores representative percent coverage of measured tandem mass spectra in selected major environmental suspect databases of interest in the context of human biomonitoring, demonstrating the current extensive gap between the number of potential substances of interest (up to hundreds of thousands) and measured spectra (0.57–3.6% of the total chemicals have spectral information available). Instruments and settings that are less comparable are revealed, primarily linear ion trap instruments, which show distinctly lower comparability
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