- MeSH
- Technology, Pharmaceutical MeSH
- Plants, Medicinal MeSH
- Plant Oils isolation & purification MeSH
- Publication type
- Pharmacopoeia MeSH
- Comparative Study MeSH
- Geographicals
- Czech Republic MeSH
- Europe MeSH
- Keywords
- ARTHROSAN (ALPA A.S.),
- MeSH
- Analgesics therapeutic use MeSH
- Biomedical Research MeSH
- Pain drug therapy MeSH
- Camphor therapeutic use MeSH
- Humans MeSH
- Ointments therapeutic use MeSH
- Menthol therapeutic use MeSH
- Oils, Volatile therapeutic use MeSH
- Rheumatic Diseases drug therapy MeSH
- Check Tag
- Humans MeSH
A method employing the headspace single-drop microextraction (HS-SDME) is presented for the determination of essential oils in dried herbal leaves. By optimising the key experimental parameters, a linear response for the individual target compounds was obtained in the concentration range from LOQ to 4 mg/mL (r(2) = 0.9912-0.9998), with LODs from 3.3 up to 20.5 microg per 100 g of dried leaves, and the repeatability within the RSD of 2.1-8.9%. The HS-SDME-based procedure, enabling a rapid and simple analysis of essential oils in herbs, was applied to selected real samples (nine essential oils in four different samples) in combination with GC-FID identification and quantification of the target volatiles.
- MeSH
- Chromatography, Gas methods MeSH
- Financing, Organized MeSH
- Oils, Volatile analysis MeSH
- Temperature MeSH
- Publication type
- Validation Study MeSH
Headspace solid-phase microextraction (HS-SPME) and solid-phase microextraction coupled with hydrodistillation (HD-SPME) were used for detection and determination of essential oils in dried leaves of Mentha piperita L., Lavandula augustifolia L. and Salvia officinalis L. The results were compared with those obtained using steam distillation, which is a reference method. The extraction time 15 min and the minimal fibre depth 1.4 cm are suitable for a 50/30 ?m polydimethylsiloxane/divinylbenzene/ carboxen fibre. The method was compared with HS-SPME and steam distillation.
The aim of this study, linked-up with a previous study on bergamot oils, was the evaluation of phototoxic potential of essential oils (orange, lemon and Litsea cubeba), used as cosmetic ingredients. The applied tiered testing strategy included chemical analysis of the substances (by means of capillary gas chromatography/mass spectrometry), in vitro 3T3 NRU phototoxicity test and EpiDerm™ skin phototoxicity test. In order to clarify the situation in man, the highest non-phototoxic/non-cytotoxic concentrations and concentrations 10 x lower (safety factor 10) were tested xin vivo by means of human skin photopatch test in a limited group of human volunteers. The study revealed, that phototoxicity of the essential oils was dependent on the content of photoactive components and the solvent used. The highest non-phototoxic concentrations obtained by the skin model assay proved to be a useful starting point for subsequent confirmatory human photopatch test aimed to identify safe concentration for human use. However, the highest non-phototoxic concentration obtained in the skin model assay cannot be applied directly for human practice (3 of 8 tested oils evoked a phototoxic reaction). A safety factor of 10 should be applied for extrapolation of experimental data from the skin model assay to man.
- MeSH
- Adult MeSH
- Dermatitis, Phototoxic etiology MeSH
- Cosmetics toxicity MeSH
- Skin Tests MeSH
- Middle Aged MeSH
- Humans MeSH
- Litsea toxicity MeSH
- Oils, Volatile toxicity MeSH
- Plant Oils toxicity MeSH
- Check Tag
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Recently, a growing number of plant essential oils (EOs) have been tested against a wide range of arthropod pests with promising results. EOs showed high effectiveness, multiple mechanisms of action, low toxicity on non-target vertebrates and potential for the use of byproducts as reducing and stabilizing agents for the synthesis of nanopesticides. However, the number of commercial biopesticides based on EOs remains low. We analyze the main strengths and weaknesses arising from the use of EO-based biopesticides. Key challenges for future research include: (i) development of efficient stabilization processes (e.g., microencapsulation); (ii) simplification of the complex and costly biopesticide authorization requirements; and (iii) optimization of plant growing conditions and extraction processes leading to EOs of homogeneous chemical composition.
The article presents the results of research into component composition of raw calendula's essential oil. The study was conducted by gas chromatography mass spectrophotometry method under the following conditions: column - CP- Wax58FFAPCB 24,5 mm x 250 mm x 0,20 mm nominal, the mobile-phase-He (helium), speed-column mobile phase -1.0 ml /min, volume sample injection - 5 mkl; resolutions (5:1), in the Split, high-boiling chamber -220°C, detector temperature 275°C; Aux-200°C, column temperature 70°C gradually increased from 10°C / min to 250°C, maintained to the end of analysis temperature regime (250°C) for 5 min. muurololnaftalenol-8.522%. In addition, it was ascertained that in different parts of the world calendula's essential oils differ from each other in qualitative composition and quantitative components.
Different types of mathematical models were applied in the last decade to simulate kinetics of supercritical fluid extraction (SFE) of essential oils from aromatic plants. Compared to the extraction of fatty oils, modeling of extraction of essential oils is more complicated due to their potential fractionation, co-extraction of less soluble compounds, and stronger effect of flow pattern on extraction yield, which is connected with solute adsorption on plant matrix. Fitting the SFE models to experimental extraction curves alone usually does not enable reliable selection among the models. Major progress was made when detailed models for the extraction from glandular structures of plants were developed. As the type of glands is characteristic for plant families, the choice of models for SFE of essential oils is substantially facilitated. As the extracts from aromatic plants contain also cuticular waxes and other less soluble substances, and essential oils themselves are mixtures of substances of different solubility in supercritical carbon dioxide, modeling of extraction of mixtures and their fractionation in time deserves more attention.
Thirty-four essential oils were tested for insecticidal activity (fumigation or topical application) against larvae Spodoptera littoralis. Twenty essential oils applied by fumigation were highly toxic to the third instar of S. littoralis larvae. Two essential oils Nepeta cataria and Thuja occidentalis were highly toxic, with LC50< or =10.0 ml/m3. Five essential oils Salvia sclarea, Thymus mastichina, Origanum majorana, Pogostemon cablin and Mentha pulegium were toxic with LC50 between 10.1 and 20.0 l ml/m3. Twenty-three essential oils were highly toxic to the third instar of S. littoralis larvae after topical application. Eight essential oils Mentha citrata, N. cataria, S. sclarea, O. vulgare, O. compactum, Melissa officinalis, T. mastichina, and Lavandula angustifolia were highly toxic with LD50 < or =0.05 microl/larvae.
