Microscale solid phase extraction of glyphosate and aminomethylphosphonic acid in water and guava fruit extract using alumina-coated iron oxide nanoparticles followed by capillary electrophoresis and electrochemiluminescence detection.
A microscale solid-phase extraction (SPE) method using alumina-coated iron oxide nanoparticles (Fe(3)O(4)@Al(2)O(3) NPs) as the affinity adsorbent for glyphosate (GLY) and its major metabolite aminomethylphosphonic acid (AMPA) in aqueous solution is reported. One milligram of Fe(3)O(4)@Al(2)O(3) NPs was employed to extract both analytes in 5 ml of aqueous solution. After 5 min extraction, magnetic NPs were isolated from sample solution by employing an external magnet. Followed by rinsing the NPs with 5 microl of 20 mM Na(4)P(2)O(7) solution for 5 min, the extract was directly analyzed using the derivatization-free CE-electrochemiluminescence (CE-ECL) method. With a sample-to-extract volume ratio of 1000, the enrichment factors for GLY and AMPA were 460 and 64, respectively. The limits of detection (LODs) were 0.3 and 30 ng ml(-1) for GLY and AMPA in water, respectively. The developed method was applied to the analysis of GLY in guava fruit. The LOD of GLY in guava was 0.01 microg g(-1). Total analysis time including sample pretreatment, SPE and CE-ECL was less than 1h.
Hsu
Chia-Chen
CC
Department of Chemistry, Tunghai University, #181, Sec. 3, Taichung Harbor Road, Taichung 40704, Taiwan.
Whang
Chen-Wen
CW
D019075:Electrophoresis, Capillary / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry; D005638:Fruit / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000032:analysis; D007555:Isoxazoles; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D063065:Organophosphonates / Q000032:analysis*; D031647:Psidium / Q000737:chemistry*; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D013777:Tetrazoles; D014874:Water Pollutants, Chemical / Q000032:analysis*; D000097797:Glyphosate
D005290:Ferric Compounds; D005998:Glycine; D007555:Isoxazoles; D063065:Organophosphonates; D013777:Tetrazoles; D014874:Water Pollutants, Chemical; D000097797:Glyphosate; C000499:ferric oxide; C418233:2-amino-3-(3-hydrox-5(2-methyl-2H-tetrazol-5-yl)isoxazol-4-yl)propionic acid