A method is described for specific quantitative analysis of ethanol in wine by gas chromatography. This method, which uses an internal standard and flame ionization detector, is more accurate and more precise than methods commonly used. Statistical analysis of data from typical winery samples shows that the standard error of estimate for the method is 0.07~/~ (v/v) over the range 7 to 24% (v/v)...

The term ‘dimension’ in the above titles refers to the use of a ‘dimension of chromatography’ – or put more simply, a column – or for multidimension – two or more columns. In the broad sense, a ‘dimension of analysis’ is any technique that provides independent analysis capability. So FTIR, MS, and GC are discrete dimensions; they can be operated independently to provide some measure of analysis...

the essential oil from the seeds of cuminum cyminum l. was isolated by hydrodistillation method and the chemical composition was determined by gas chromatography-mass spectrometry (gc/ms). the yield of the oil was found to be 3.0% (on dry weight basis). a total of twenty six components, representing 96.7% of the oil were identified. cuminaldehyde (49.4%), p-cymene (17.4%), b-pinene (6.3%), a-ter...

the volatile oil obtained by hydrodistillation of the aerial parts of matricaria chamomilla l. (asteraceae) growing in botanical garden, isfahan university of medical sciences, iran, was investigated by gas chromatography (gc) and gc/ mass spectrometery (ms). sixty-three components were characterized, representing 86.21% of the total oil components detected. α-bisabolol oxide a (25.01%) and a-b...

in this study, a simple and reliable method by gas chromatograph–mass spectrometry (gc–ms) was developed for the fast and regular identification of 3, 4-mdma impurities in ecstasy tablets. in so doing, 8 samples of impurities were extracted by diethyl ether under alkaline condition and then analyzed by gc–ms. the results revealed high mdma levels ranging from 37.6% to 57.7%. the gc-ms method sh...

An analytical method, based on separation with gas chromatography (GC) and detection with optical fiber (OF), was used for the separation, detection and quantification of benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene. The use of OF as a detector is based on the variations of the reflected optical power detected when the aromatic compounds eluted from the GC column are sorbed i...

the roots and rhizomes of tanacetum parthenium (l.) schulz. bip. (asteraceae), have been used in iranian traditional medicine under the name of aqhovan, as digestive and stomachic tonic. composition of the essential oil, which was obtained from the root of t. parthenium collected from karaj, was determined by gas chromatography, combined gc/ms and gc/ir. in total, 20 components (92% of essentia...

different solvent extracts of a red algae, hypnea flagelliformis,and two brown algae, cystoseira myrica and sargassum boveanum, collected from the persian gulf coast were subjected to different bioassays including: 1,1-diphenyl-2-picrylhydrazyl (dpph) free radical scavenging assay, antibacterial and antifungal activity by thin layer chromatography (tlc)-bioautography, agar disc diffusion (add) ...