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Simultaneous determination of multiple phytohormones in plant extracts by liquid chromatography-electrospray tandem mass spectrometry.
TLDR
A rapid multiresidue method to quantify three different classes of plant hormones has been developed and the analytical method validated in four different plant tissues, citrus leaves, papaya roots, barley seedlings, and barley immature embryos. Expand
Residue determination of glyphosate, glufosinate and aminomethylphosphonic acid in water and soil samples by liquid chromatography coupled to electrospray tandem mass spectrometry.
TLDR
The use of labelled glyphosate as internal standard allowed improving the recovery and precision for glyphosate and AMPA, while it was not efficient for glufosinate, that was quantified by external standards calibration. Expand
Multiresidue liquid chromatography tandem mass spectrometry determination of 52 non gas chromatography-amenable pesticides and metabolites in different food commodities.
A multiresidue method is developed for the screening, quantification and confirmation of 43 pesticides, belonging to different chemical families of insecticides, acaricides, fungicides, herbicidesExpand
Rapid direct determination of pesticides and metabolites in environmental water samples at sub-microg/l level by on-line solid-phase extraction-liquid chromatography-electrospray tandem mass
TLDR
Efficiency and applicability of this method was evaluated by the analysis of several samples included in a monitoring program, obtaining good results for all compounds at 0.5 and 0.1 microg/l. Expand
Re-evaluation of glyphosate determination in water by liquid chromatography coupled to electrospray tandem mass spectrometry.
An analytical method based on on-line solid-phase extraction-liquid chromatography coupled to electrospray tandem mass spectrometry (SPE-LC-ESI-MS/MS) for the determination of glyphosate andExpand
Direct determination of chlorpyrifos and its main metabolite 3,5, 6-trichloro-2-pyridinol in human serum and urine by coupled-column liquid chromatography/electrospray-tandem mass spectrometry.
TLDR
The validated procedures provide excellent tools for the specific assessment of occupational exposure to the organophosphorus pesticide chlorpyrifos, throughout the analysis of both human serum and urine, and it is more selective and sensitive than the current assay based on the measurement of the decrease in the cholinesterase activity. Expand
Residue determination of cyromazine and its metabolite melamine in chard samples by ion-pair liquid chromatography coupled to electrospray tandem mass spectrometry
Abstract A method has been developed for the sensitive and selective determination of cyromazine and its metabolite melamine in chard samples. Both compounds are small polar basic molecules, makingExpand
Strategies for quantification and confirmation of multi-class polar pesticides and transformation products in water by LC–MS2 using triple quadrupole and hybrid quadrupole time-of-flight analyzers
Liquid chromatography–tandem mass spectrometry (LC–MS2) is an excellent technique for the determination of polar pesticides and transformation products in water. On-line trace enrichment byExpand
Study of matrix effects on the direct trace analysis of acidic pesticides in water using various liquid chromatographic modes coupled to tandem mass spectrometric detection.
TLDR
Of all the tested configurations, LC-LC-ESI-MS-MS with the column combination Discovery C18/ABZ+ was the most favorable as regards elimination of matrix effects and provided reliable quantification of all compounds using external calibration at the tested low level, emphasizing the feasibility of such an approach in this field of analysis. Expand
Direct determination of alkyl phosphates in human urine by liquid chromatography/electrospray tandem mass spectrometry.
TLDR
The applicability of the LC/MS/MS method was demonstrated by applying it to the analysis of urine samples of farmers exposed to the organophosphorus pesticide chlorpyrifos, with good correlation between application of the product in the field and concentration levels of dialkyl phosphates. Expand
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