Interest in the health-promoting effects of virgin olive oil, an important part of the "Mediterranean diet", prompted us to determine the antiinflammatory effects of erythrodiol, beta-sitosterol and squalene, identified as major components of the so-called "unsaponifiable fraction" of virgin olive oil, as well as of the phenolic compounds from the "polar fraction": oleuropein, tyrosol, hydroxyt...

Edible peanut seed represents approximately forty percent of the total mass of the peanut plant at harvest. This plant material is a potential source of nutraceutical compounds. Aqueous acetone was used to extract polar compounds from the leaves and roots of peanut plants, and from the shells of peanut seeds. The antioxidant activities of the extracts using ORAC were determined and compared. Th...

The cuticular lipid compounds, usually named waxes, present in the layering of Quercus suber adult leaves were extracted with solvents different polarities (n-hexane, dichloromethane and acetone) analysed by GC–MS. Q. have a substantial wax layer (2.8% leaf mass 239 μg/cm2), composed predominantly terpenes (43–63% all compounds), followed aliphatic long chain molecules, mainly fatty acids, smal...

The quest for solid-state materials with tailored chemical and physical features stimulates the search for general prescriptions to recognize and forecast their electronic structures providing valuable information about the experimentally determined bulk properties at the atomic scale. Although the concepts first introduced by Zintl and Hume–Rothery help to understand and forecast the bonding m...

Plant extracts may contain highly polar and/or highly non-polar substances which can interfere with the separation of pure compounds during isolation if they are present in a very high concentration. Commonly known examples of polar substances are carbohydrates, glycosides and amino acids, while non-polar substances include waxes, oils, sterols and chlorophylls (Klejdus et al. 1999). Preliminar...

Hydrophilic interaction chromatography (HILIC) was developed by Andrew Alpert for separation of highly polar compounds. HILIC is characterized by a high organic mobile phase concentration and the hydrophilic stationary phase. Thus, the retention times of highly polar compounds are increased with the increase of the hydrophilicity of the solutes. Recently, it became necessary to determine highly...

Deep eutectic solvents (DES) as a new kind of green solvent were used for the first time to excellently extract phenolic compounds from model oil. It was also proved that DES could be used to extract other polar compounds from non-polar or weakly-polar solvents by liquid-phase microextraction.

We show that polycyclic aromatic hydrocarbon (PAH) based field effect transistor (FET) arrays can serve as excellent chemical sensors for the detection of volatile organic compounds (VOCs) under confounding humidity conditions. Using these sensors, w/o complementary pattern recognition methods, we study the ability of PAH-FET(s) to: (i) discriminate between aromatic and non-aromatic VOCs; (ii) ...