Identification of corrosion inhibiting long-chain primary alkyl amines by gas chromatography and gas chromatography–mass spectrometry

2007 ◽  
Vol 263 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Peter Kusch ◽  
Gerd Knupp ◽  
Marcus Hergarten ◽  
Marian Kozupa ◽  
Maria Majchrzak
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Chromatography Mass Spectrometry ◽  
Alkyl Amines ◽  
Chromatography Mass Spectrometry ◽  
Long Chain

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.

scholarly journals Determination of alkyl amines in atmospheric aerosol particles: a comparison of gas chromatography-mass spectrometry and ion chromatography approaches

2014 ◽  
Vol 7 (3) ◽  
pp. 2127-2152 ◽  
Author(s):  
R.-J. Huang ◽  
W.-B. Li ◽  
Y.-R. Wang ◽  
Q. Y. Wang ◽  
K.-F. Ho ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Ion Chromatography ◽  
Aerosol Particles ◽  
Gas Chromatography Mass Spectrometry ◽  
Limits Of Detection ◽  
Alkyl Amines ◽  
Chromatography Mass Spectrometry ◽  
Analytical Approaches

Abstract. In recent years low molecular weight alkyl amines have been recognized to play an important role in particle formation and growth in the lower atmosphere. However, major uncertainties are associated with their atmospheric processes, sources and sinks, mostly due to the lack of ambient measurements and the difficulties in accurate quantification of alkyl amines at trace level. In this study, we present the evaluation and optimization of two analytical approaches, i.e., gas chromatography-mass spectrometry (GC-MS) and ion chromatography (IC), for the determination of alkyl amines in aerosol particles. Alkyl amines were converted to carbamates through derivatization with isobutyl chloroformate for GC-MS determination. A set of parameters affecting the analytical performances of the GC-MS approach, including reagent amount, reaction time and pH value, was evaluated and optimized. The accuracy is 84.3–99.1%, and the limits of detection obtained are 1.8–3.9 pg. For the IC approach, a solid phase extraction (SPE) column was used to separate alkyl amines from interfering cations before IC analysis. 1–2% (v/v) of acetone (or 2–4% (v/v) of acetonitrile) was added to the eluent to improve the separation of alkyl amines on the IC column. The limits of detection obtained are 2.1–15.9 ng and the accuracy is 55.1–103.4%. The lower accuracy can be attributed to evaporation losses of amines during the sample concentration procedure. Measurements of ambient aerosol particle samples collected in Hong Kong show that the GC-MS approach is superior to the IC approach for the quantification of primary and secondary alkyl amines due to its lower detection limits and higher accuracy.

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