Dimethyl disulfide derivatives of long chain alkenes, alkadienes, and alkatrienes for gas chromatography/mass spectrometry

1989 ◽  
Vol 61 (14) ◽  
pp. 1564-1571 ◽  
Author(s):  
David A. Carlson ◽  
Chin Shyan. Roan ◽  
Richard A. Yost ◽  
Julio. Hector
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Dimethyl Disulfide ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Derivatives Of ◽  
Long Chain

Comprehensive analysis of metabolites in Corynebacterium glutamicum by gas chromatography/mass spectrometry

2004 ◽  
Vol 385 (9) ◽  
pp. 853-861 ◽  
Author(s):  
Sergey Strelkov ◽  
Mirko von Elstermann ◽  
Dietmar Schomburg
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Corynebacterium Glutamicum ◽  
Growth Conditions ◽  
Gas Chromatography Mass Spectrometry ◽  
Fast Method ◽  
Chromatography Mass Spectrometry ◽  
High Matrix ◽  
First Time ◽  
Derivatives Of

AbstractAn analytical method based on gas chromatography/mass spectrometry was developed for metabolome investigation ofCorynebacterium glutamicum. For the first time a fast method for metabolic screening that can be automated is described for this organism. More than 1000 compounds could be detected per experiment, ca. 330 of those showed a peak area significantly above background. Out of these 164 compounds were identified so far, representing derivatives of 121 different metabolites, which were quantified in one sample. In spite of the different chemical nature of metabolites and high matrix content, a measurement reproducibility in the range of 6% error was achieved. The application of this method for the analysis of the adaptation ofC. glutamicumto different growth conditions is demonstrated.

Phytochemical Screening, Isolation, and Structure Elucidation of the Radish (Raphanus sativus Linn.) Bulb Ethanolic Extract Using Gas Chromatography- Mass Spectrometry (GC-MS)

10.17158/233 ◽  
2012 ◽  
Vol 18 (1) ◽  
Author(s):  
Ma. Eva C. San Juan ◽  
Ramchand S. Jumala ◽  
Karen Hope G. Niasca
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Raphanus Sativus ◽  
Ethanolic Extract ◽  
Bioactive Molecules ◽  
Gas Chromatography Mass Spectrometry ◽  
Phytochemical Analysis ◽  
Phytochemical Screening ◽  
Chromatography Mass Spectrometry ◽  
Long Chain

Nowadays, plant is being used as a biofuel, a probable source for a pesticide and it is valued for its pharmacological effects. Hence, the researchers engaged in the scientific approach to provide explanation to these claims. The study focused on the phytochemical screening of the ethanolic extract of radish bulbs (Raphanus sativus). It further dealt on the isolation and determination of the molecular masses to provide probable structures and associated molecular properties for its constituents.<br />Alkaloids, flavonoids, saponins and tannins were analyzed. Further, this effort involved analysis through Thin Layer Chromatography (TLC) using the mobile phase of Toluene: Chloroform (9:11) and Gas Chromatography- Mass Spectrometry (GC-MS) to analyze the first spot (Retention Factor= 0.667).<br />Phytochemical analysis showed no tannins. Using TLC, it revealed two spots having Rf values of 0.667 and 0.507, respectively. Using GC-MS method, 24 different molecules were isolated and analyzed of which only 23 were given probable structures. The 23 molecules constituted 11 long-chain alkanes, 4 long-chain alkyl esters, 2 aromatic ketones, a benzyl halide, an aryl ether, a quinone, an aromatic aldehyde, a long chain aromatic alkane, and a long-chain alkyl nitrile. With this finding, the bulb extract may be a good source of potential biofuel (mono-alkyl ester), UV A, B and C blockers in the form of diphenyl-ketone, oviposition attractants (long-chain alkanes) and also a source of bioactive molecules such as estragole which shows antispasmodic effect, methyl palmitate with immunosuppressive effect in semi-allografts and hepatoprotective activity in rats, and an analogue of the antidepressant alfetamine.

Benzodiazepines identified by capillary gas chromatography-mass spectrometry, with specific ion screening used to detect benzophenone derivatives.

1989 ◽  
Vol 35 (7) ◽  
pp. 1394-1398 ◽  
Author(s):  
C E Jones ◽  
F H Wians ◽  
L A Martinez ◽  
G J Merritt
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Forensic Toxicology ◽  
Urine Samples ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Selection Mode ◽  
Unequivocal Identification ◽  
Hydrolysis Of ◽  
Derivatives Of

Abstract We developed algorithms for confirmation and identification of benzodiazepines and their metabolites, initially detected in urine samples by enzyme-multiplied immunoassay (EMIT). These algorithms are based on the pattern of benzophenone derivatives of benzodiazepines obtained by gas chromatography-mass spectrometry (GC-MS) with use of a modified specific ion selection mode. Benzophenone derivatives were produced by acid hydrolysis of urine samples containing benzodiazepines and (or) their metabolites. We present mass spectra of the newer benzodiazepines--alprazolam, midazolam, and triazolam--and we determined the detection limit (0.2 mg/L) for these drugs as measured with the EMIT d.a.u. benzodiazepine assay and the ETS instrument (both from Syva Co.). We conclude that these algorithms are useful mostly in forensic toxicology in which unequivocal identification of benzodiazepines is the desired goal.

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