Background: Essential oils and various extracts from plant are of great interests in the industry and scientific research.   Objective: This study was designed to examine the chemical composition of essential oil and of Echinophora platyloba from Iran.   Method: The chemical composition of the hydrodistilled essential oil of the air-dried aerial parts of Echinophora platyloba growing wild in ...

The zinc-cadmium oxide (ZnO-CdO) nanocomposites with different weight percentages of cadmium oxide (CdO) nanoparticles were successfully synthesized by the sonochemical method using zinc and cadmium nitrates as precursors to probe their nano-structured surfaces for the decomposition reactions of chloroethyl phenyl sulfide (CEPS) as a surrogate of sulfur mustard agent simulant. Scanning electron...

The gas chromatography-olfactometry (GC-O) technique couples traditional gas chromatographic analysis with sensory detection in order to study complex mixtures of odorous substances and to identify odor active compounds. The GC-O technique is already widely used for the evaluation of food aromas and its application in environmental fields is increasing, thus moving the odor emission assessment ...

The first molded gas chromatography (GC) microcolumn is described. This microcolumn consists of a single microtextured thermoset polymer composite which acts as both the structural material and the stationary phase. The resultant microcolumn is inexpensive and has been coupled to a disposable colorimetric sensor array, creating a disposable column-detector unit and demonstrating a proof of conc...

Inverse gas chromatography (IGC) represents a unique refinement of a classic chromatographic method has the potential to unlock some of the more difficult to measure physicochemical properties of pharmaceutical materials such as powder surface energies, acid/base/polar functionality of surfaces, diffusion kinetics, solubility parameters, surface heterogeneity and phase transition temperatures/h...

Four of the major HS-GC analyses that are typically performed at breweries are described here (Table 1). The first, and most important, is monitoring for vicinal diketones (VDK) in the beer, which include 2,3-butanedione (diacetyl) and 2,3-pentanedione. VDK are considered extremely important since they are known to affect the taste of the beer. These components produce a butterlike flavor and a...

The liquid product obtained via the biomass flash pyrolysis is commonly called bio-oil or pyrolysis oil. Bio-oils can be used as sources for chemicals or as fuels, primarily in mixtures or emulsions with fossil fuels. A detailed chemical characterization of bio-oil is necessary to determine its potential uses. Such characterization demands a powerful analytical technique such as comprehensive t...

the volatile constituents of aerial parts of euphorbia aellenii rech.f. and e. microsciadea boiss. were analyzed by gas chromatography (gc) and gc-mass spectrometry (ms) methods. the main volatile constituents of e. aellenii were phytol isomer (47.3%), camphene (31.9%) and caryophyllene oxide (20.6%), while the major volatile components of e. microsciadea were trans-anethole (74.5%), limonene (...

Elongating shoots of rapidly growing clones of Salix viminalis L. (clone 683-4) and Salix dasyclados Wimm. (clone 908) harvested in early August were analyzed for endogenous gibberellins (GA). Distribution of GA-like activity, determined by Tan-ginbozu dwarf rice microdrop bioassay after reverse phase C(18) high performance chromatography, was similar for both species. For S. dasyclados, combin...

Gas chromatography/mass spectrometry (GC/MS) of the MOD flake Micro-samples (3.3 mg from the MOD flake and less than 1 mg from the other samples, see below) were collected from the specimens and submitted to an analytical procedure (GC/MS) in order to identify lipids, waxes, proteins, resinous materials and saccharides [1-2]. GC/MS had already been successfully employed for the characterization...