Direct Aqueous Determination of Glyphosate and Related Compounds by Liquid Chromatography/Tandem Mass Spectrometry using Reversed-Phase and Weak Anion-Exchange Mixed-mode Column
26 June 2011, 20:29:50
Publication year: 2011
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Chunyan, Hao , David, Morse , Franca, Morra , Xiaoming, Zhao , Paul, Yang , ...
Analysis of the broad-spectrum herbicide glyphosate and its related compounds is quite challenging. Tedious and time-consuming derivatization is often required for these substances due to their high polarity, high water solubility, low volatility and molecular structure which lacks either a chromophore or fluorophore. A novel liquid chromatography/tandem mass spectrometry (LC/MS-MS) method has been developed for the determination of glyphosate, aminomethylphosphonic acid (AMPA) and glufosinate using a reversed-phase and weak anion-exchange mixed-mode Acclaim® WAX-1 column. Aqueous environmental samples are directly injected and analyzed in 12minutes with no sample concentration or derivatization steps. Two multiple reaction monitoring (MRM) channels are monitored in...
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Chunyan, Hao , David, Morse , Franca, Morra , Xiaoming, Zhao , Paul, Yang , ...
Analysis of the broad-spectrum herbicide glyphosate and its related compounds is quite challenging. Tedious and time-consuming derivatization is often required for these substances due to their high polarity, high water solubility, low volatility and molecular structure which lacks either a chromophore or fluorophore. A novel liquid chromatography/tandem mass spectrometry (LC/MS-MS) method has been developed for the determination of glyphosate, aminomethylphosphonic acid (AMPA) and glufosinate using a reversed-phase and weak anion-exchange mixed-mode Acclaim® WAX-1 column. Aqueous environmental samples are directly injected and analyzed in 12minutes with no sample concentration or derivatization steps. Two multiple reaction monitoring (MRM) channels are monitored in...
Analysis of primary aromatic amines in the mainstream waterpipe smoke using liquid chromatography—electrospray ionization tandem mass spectrometry
26 June 2011, 20:29:50
Publication year: 2011
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Jens, Schubert , Oliver, Kappenstein , Andreas, Luch , Thomas G., Schulz
In recent years waterpipe smoking has spread worldwide and emerged as global health issue. Yet only little is known on the composition of waterpipe smoke. Here, we present a study on the identification and quantification of primary aromatic amines (PAAs) in this complex environmental matrix. Smoking of the waterpipe was conducted with a smoking machine and particulate matter was collected on glass fiber pads. We developed a fast, simple and specific liquid chromatography—electrospray ionization tandem mass spectrometry (LC-MS/MS) approach to simultaneously detect 31 different PAAs in this matrix. The detection limits comprised a range of 0.45ng to 4.50ng per smoking...
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Jens, Schubert , Oliver, Kappenstein , Andreas, Luch , Thomas G., Schulz
In recent years waterpipe smoking has spread worldwide and emerged as global health issue. Yet only little is known on the composition of waterpipe smoke. Here, we present a study on the identification and quantification of primary aromatic amines (PAAs) in this complex environmental matrix. Smoking of the waterpipe was conducted with a smoking machine and particulate matter was collected on glass fiber pads. We developed a fast, simple and specific liquid chromatography—electrospray ionization tandem mass spectrometry (LC-MS/MS) approach to simultaneously detect 31 different PAAs in this matrix. The detection limits comprised a range of 0.45ng to 4.50ng per smoking...
Selective extraction of alkaloids in human urine by on-line single drop microextraction coupled with sweeping micellar electrokinetic chromatography
26 June 2011, 20:29:50
Publication year: 2011
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Wenhua, Gao , Gaopan, Chen , Yaowen, Chen , Nana, Li , Tufeng, Chen , ...
A novel method of on-line single drop microextraction (SDME) coupled with sweeping micellar electrokinetic chromatography (MEKC) for the selective extraction and dual preconcentration of alkaloids was developed. In this technique, analytes of three alkaloids were firstly extracted from 4.0mL basic aqueous sample solution (donor phase, 500mM NaOH) into a layer of n-octanol at temperature 30 ∘C with the stirring rate of 1150rpm, then back-extracted into the acidified aqueous acceptor (acceptor phase, 50mM H3PO4) suspended at the tip of a capillary at 650rpm. After then, the aqueous acceptor was introduced into capillary by hydrodynamic injection with a height difference of 15cm...
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
Wenhua, Gao , Gaopan, Chen , Yaowen, Chen , Nana, Li , Tufeng, Chen , ...
A novel method of on-line single drop microextraction (SDME) coupled with sweeping micellar electrokinetic chromatography (MEKC) for the selective extraction and dual preconcentration of alkaloids was developed. In this technique, analytes of three alkaloids were firstly extracted from 4.0mL basic aqueous sample solution (donor phase, 500mM NaOH) into a layer of n-octanol at temperature 30 ∘C with the stirring rate of 1150rpm, then back-extracted into the acidified aqueous acceptor (acceptor phase, 50mM H3PO4) suspended at the tip of a capillary at 650rpm. After then, the aqueous acceptor was introduced into capillary by hydrodynamic injection with a height difference of 15cm...
Acrylate ester-based monolithic columns for capillary electrochromatography separation of triacylglycerols in vegetable oils
26 June 2011, 20:29:50
Publication year: 2011
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
M.J., Lerma-García , M., Vergara-Barberán , J.M., Herrero-Martínez , E.F., Simó-Alfonso
A simple and reliable method for the evaluation of triacylglycerols (TAGs) in vegetable oils by capillary electrochromatography (CEC) with UV-Vis detection, using octadecyl acrylate (ODA) ester-based monolithic columns, has been developed. The percentages of the porogenic solvents in the polymerization mixture, and the mobile phase composition, were optimized. The optimum monolith was obtained at the following ratios: 40:60% (wt/wt) monomers/porogens, 60:40% (wt/wt) ODA/1,3-butanediol diacrylate and 23:77% (wt/wt) 1,4-butanediol/1-propanol (14 wt% 1,4-butanediol in the polymerization mixture). A satisfactory resolution between TAGs was achieved in less than 12min with a 65:35 (v/v) acetonitrile/2-propanol mixture containing 5mM ammonium acetate. The method was applied...
Source: Journal of Chromatography A, In Press, Accepted Manuscript, Available online 26 June 2011
M.J., Lerma-García , M., Vergara-Barberán , J.M., Herrero-Martínez , E.F., Simó-Alfonso
A simple and reliable method for the evaluation of triacylglycerols (TAGs) in vegetable oils by capillary electrochromatography (CEC) with UV-Vis detection, using octadecyl acrylate (ODA) ester-based monolithic columns, has been developed. The percentages of the porogenic solvents in the polymerization mixture, and the mobile phase composition, were optimized. The optimum monolith was obtained at the following ratios: 40:60% (wt/wt) monomers/porogens, 60:40% (wt/wt) ODA/1,3-butanediol diacrylate and 23:77% (wt/wt) 1,4-butanediol/1-propanol (14 wt% 1,4-butanediol in the polymerization mixture). A satisfactory resolution between TAGs was achieved in less than 12min with a 65:35 (v/v) acetonitrile/2-propanol mixture containing 5mM ammonium acetate. The method was applied...
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