Search results for "GC"

Chromatogrphic Profiles of Polyphenols and Terpenoids in the Herbs of Some Thymus L. Represntatives

2022

The aim of the work. To perform the identification of phenolic compounds and terpenoids in the aerial parts of Thymus pulegioides L. (cultivar ‘2/6-07’), Thymus richardii Pers. (cultivar 'Fantasy') and Thymus vulgaris L. (cultivar ‘Jalos’) using thin layer chromatography (TLC), as well as to conduct the gaschromatographic analysis of Thymus richardii essential oil. Materials and Methods. The TLC method was used in this study for the qualitative analyses of polyphenols and non-polar compounds in the aerial part of three Thyme (Thymus L.) species from the Lamiaceae Martinov family cultivated in Kherson region (Ukraine). The volatile compounds were determined in the essential oil of Thymus ric…

Confronto chemiotipico tra accessioni spontanee e coltivate del genere Thymus raccolte sui monti Nebrodi (Sicilia N-E)

2009

Il genere Thymus, largamente rappresentato all'interno della flora spontanea mediterranea, comprende numerose specie tradizionalmente adoperate dalle popolazioni residenti nel comprensorio, che ne fanno uso per svariate finalità alimentari, medicinali e artigianali. Per questo motivo numerosi timi, oltre che prelevati dallo spontaneo, vengono anche tradizionalmente coltivati all'interno di giardini e orti domestici, che presumibilmente avranno giocato un ruolo importante nelle dinamiche di differenziazione e conservazione delle specie. Con l'obiettivo di acquisire nuove informazioni in tal senso, nella primavera-estate del 2007 accessioni di Thymus spinulosus e Thymus longicaulis sono state…

Influence of organic amendments on diuron leaching through an acidic and a calcareous vineyard soil using undisturbed lysimeters.

2008

9 pages; International audience; The influence of different organic amendments on diuron leaching was studied through undisturbed vineyard soil columns. Two composts (A and D), the second at two stages of maturity, and two soils (VR and Bj) were sampled. After 1 year, the amount of residues (diuron þ metabolites) in the leachates of the VR soil (0.19e0.71%) was lower than in the Bj soil (4.27e8.23%), which could be explained by stronger diuron adsorption on VR. An increase in the amount of diuron leached through the amended soil columns, compared to the blank, was observed for the Bj soil only. This result may be explained by the formation of mobile complexes between diuron and water-extrac…

Continental weathering and climatic changes inferred from clay mineralogy and paired carbon isotopes across the early to middle Toarcian in the Paris…

2014

Abstract Lower Toarcian strata (Lower Jurassic) have been extensively studied with a view to understanding the oceanographic, climatic and biological processes that drove the Earth's system into an Oceanic Anoxic Event (OAE). For this time period, the evolution of the European marine seaways is now relatively well constrained owing to multiple geochemical studies, but investigations regarding climatic trends in the continental realm remain sparse. In the present study, we test the clay mineralogy as a continental climate-sensitive proxy in the well-documented Sancerre core (southern Paris Basin). We compare variations in the kaolinite content with p CO 2 fluctuations (derived from paired ca…

Preliminary Estimation of Deoxynivalenol Excretion through a 24 h Pilot Study

2015

A duplicate diet study was designed to explore the occurrence of 15 Fusarium mycotoxins in the 24 h-diet consumed by one volunteer as well as the levels of mycotoxins in his 24 h-collected urine. The employed methodology involved solvent extraction at high ionic strength followed by dispersive solid phase extraction and gas chromatography determination coupled to mass spectrometry in tandem. Satisfactory results in method performance were achieved. The method"s accuracy was in a range of 68%108%, with intra-day relative standard deviation and inter-day relative standard deviation lower than 12% and 15%, respectively. The limits of quantitation ranged from 0.1 to 8 μg/Kg. The matrix effect w…

Nitrogen isotope evidence for stepwise oxygenation of the ocean during the Great Oxidation Event

2019

24 pages; International audience; The Earth’s oxygenation represents one of the most important environmental drivers of life’s evolution, with the first rise, known as ‘the Great Oxidation Event’ (GOE), corresponding to unpreceded accumulation of atmospheric O2, changes in the flux of marine nutrients and possibly global glaciations. However, the detailed evolution of the GOE is still debated, as for instance the accumulation trends of oceanic versus atmospheric oxygen and the nature of biogeochemical responses to oxygenation. Here, we combine organic carbon and bulk nitrogen isotope compositions with major element concentrations and iron speciation data of sedimentary rocks recovered from …

Comparison of the volatile oils ofHypericum scabrum L. andHypericum perforatum L. from Turkey

1997

The composition of the volatile oils obtained from the aerial parts of Hypericum scabrum L. and H. perforatum L. was analysed by GC and GC‐MS. While the oil of H. scabrum L. contained a-pinene (71.6%), b-caryophyllene (4.8%), myrcene (3.8%), cadalene (3.4%) and b-pinene (2.9%), the oil of H. perforatum L. contained a-pinene (61.7%), 3-carene (7.5%), b-caryophyllene (5.5%), myrcene (3.6%), cadalene (3.2%) and other components. Twenty-nine and 27 terpenoid compounds have been identified in the volatile oils of H. scabrum L. and H. perforatum L., respectively. #1997 by John Wiley & Sons, Ltd.

In the rail sector, France needs to do more to connect its regional networks to the European network

2023

In an article for "Le Monde" newspaper, the legal expert Martial Pernet notes that, despite the texts in force, which he urges to be applied, efforts must be made to achieve the unification of the European rail network.

A fine tuned strategy by Trissolcus Brochymaenae (Hymenoptera: Scelionidae) to eploit chemical traces left by Murgantia histrionica (Heteroptera:Pent…

2008

Effect of bioclimatic area on the composition and bioactivity of Tunisian Rosmarinus officinalis essential oils

2014

The chemical composition of eight Tunisian Rosmarinus officinalis L. populations (A-H) from different bioclimatic areas has been examined by gas chromatography (GC) and GC-mass spectrometry. The essential oils are characterised by high amounts of oxygenated monoterpenes (58.2-71.7%) followed by monoterpene hydrocabons (15.1-26.7%). 1,8-Cineole, camphor, α-pinene and borneol are the main representative components. The antioxidant activity was investigated by 2,2-diphenyl-1-picrylhydrazyl radical (DPPH), ferric reducing ability power assay and β-carotene bleaching test. Samples showed antiradical activity by inhibiting DPPH radical with IC50 values ranging from 375.3 to 592.8 μg mL(- 1) for s…