Determination of glyphosate and AMPA on polyester-toner electrophoresis microchip with contactless conductivity detection.
作者： Eduardo R. da Silva , Thiago P. Segato , Wendell K. T. Coltro , Renato S. Lima , Emanuel Carrilho
关键词:
摘要: This paper reports a method for rapid, simple, direct, and reproducible determination of glyphosate its major metabolite aminomethylphosphonic acid (AMPA). The platform described herein uses polyester-toner microchips incorporating capacitively coupled contactless conductivity detection electrophoresis separation the analytes. microchip presented 150 μm-wide 12 μm-deep microchannels, with injection lengths 10 40 mm long, respectively. best results were obtained 320 kHz frequency, 4.5 Vpp excitation voltage, 80 mmol/L CHES/Tris buffer at pH 8.8, in -1.0 kV 7 s, -1.5 kV. RSD values related to peak areas AMPA 1.5 3.3% 10.1 8.6% intra- interchip assays, limits 45.1 70.5 μmol/L, respectively, without any attempt preconcentration Finally, was applied river water samples which (1.0 each) added. recovery 87.4 83.7% AMPA, percentages LOD here similar others reported literature.
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