Electrophysiological techniques are used in insect neuroscience to measure the response of olfactory neurons to volatile odour stimuli. Widely used systems to deliver an olfactory stimulus to a test insect include airstream guided flow through glass cartridges loaded with a given volatile compound on a sorbent support. Precise measurement of the quantity of compound reaching the sensory organ o...

A validated method for the simultaneous determination of prominent volatile cleavage products (CPs) of β-carotene in cell culture media has been developed. Target CPs comprised β-ionone (β-IO), cyclocitral (CC), dihydroactinidiolide (DHA), and 1,1,6-trimethyltetraline (TMT). CPs were extracted by solid-phase extraction applying a phenyl adsorbent, eluted with 10% (v/v) tetrahydrofuran in n-hexa...

S U M M A R Y Molecular distillates of corn oil consisting of the three most volatile 1.7 per cent cuts and the next most volatile 4.9 per cent cut obtained from 150 kg. of refined oil have been subjected to simple solvent and chromatographic fractionation. These fractions represented about 10 per cent of the original oil and some 50 per cent of its total unsaponifiable material. About 74 per ...

The purpose of this study is to develop a novel liquisolid technique to enhance the dissolution rate of poorly water soluble drug Carvedilol, a BCS class II drug, which is a β-blocker, by using different excipients. The main components of a liquisolid system are a non volatile solvent, carrier and coating materials and a disintegrant. Liquisolid system refers to the formulations that are formed...

The odor-active volatile compounds of yellow tamarillo fruit (S. betaceum Cav.) were identified and quantified by using a sensomics approach, combining a gentle volatile extraction (solvent-assisted flavor evaporation (SAFE)), gas chromatography-mass spectrometry (GC-MS), and sensory analyses (gas chromatography-olfactometry (GC-O) and aroma extract dilution analysis (AEDA)). The medium-term pu...

Lighter fluid, like gasoline, model airplane glue, paint thinner, varnish, nail polish remover, and even some types of cover-up products, are all known in chemistry as "organic solvents," or part of the volatile organic compound (VOC) family. Like the effects of low-dose anesthesia, the pungent fumes of these chemicals produce a lightheaded and hot feeling. Many heavy solvent sniffers report al...

This paper reports the physicochemical properties that describe the adsorption of a series of solutes onto the surfaces of amorphous carbon blacks. Adsorption was studied at concentrations that correspond to low surface coverages and in the presence of volatile solvent diluents. The adsorbates and adsorbents were selected for their relevance as models for environmental agent-particle complexes ...

Volatile com pounds which are released from fresh leaves o f Thuja occidentalis inhibited ger­ m ination o f seeds o f Amaranthus caudatus and Lepidium sativum. The volatile com pounds were obtained by a vacuum m ethod applied to the leaves, by direct analysis o f the content o f secretory organs and by solvent extraction o f leaves. The bioactive com pounds proved to be m onoterpenes. The high...

The aim of this study was to compare the solubility of selected volatile organic compounds in water and silicon oil using the simple static headspace method. The experimental design allowed equilibrium achievement within 30 – 60 minutes. Infinite dilution activity coefficients and Henry’s law constants for various organics representing esters, ketones, alkanes, aromatics, cycloalkanes and amine...

The complex aroma of wine is derived from many sources, with grape-derived components being responsible for the varietal character. The ability to monitor grape aroma compounds would allow for better understanding of how vineyard practices and winemaking processes influence the final volatile composition of the wine. Here, we describe a procedure using GC-MS combined with headspace solid-phase ...