Walaiporn Chanchanasophon. Determination of glyphosate, glufosinate and their metabolites by liquid chromatography-tandem mass spectrometr. Master's Degree(Chemistry). Chulalongkorn University. Office of Academic Resources. : Chulalongkorn University, 2012.
Determination of glyphosate, glufosinate and their metabolites by liquid chromatography-tandem mass spectrometr
Abstract:
A liquid chromatographytandem mass spectrometry (LC-MS/MS) has been developed for the simultaneous determination of glyphosate, glufosinate, and their metabolites (aminomethylphosphonic acid (AMPA), 3-(methylphosphinico) propionic acid (3-MPPA), and N-acetyl-glufosinate) in rice. A comparative study of various chromatographic separation modes such as hydrophilic interaction liquid chromatography (HILIC), reversed phase liquid chromatography (RPLC), and ion chromatography (IC) were studied. Parameters affecting chromatographic separations such as type, concentration, and pH of mobile phase were studied and optimized separately. IC mode has a better separation than HILIC and RPLC mode, which were good resolutions and symmetric peak shapes. The linearity was achieved in the range of 0.05-2.8 mg/kg with acceptable values of correlation coefficient, R2 > 0.89 for all compounds. The mean recovery and relative standard deviation (RSD) were in the range of 87-110% and 2-23% respectively, at MRL, 5-MRL and 10-MRL concentration level. This method was simple, fast, used less chemicals and had no derivatization step.