Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1216, Issue 49, Pages 8575-8580Publisher
ELSEVIER
DOI: 10.1016/j.chroma.2009.10.023
Keywords
Glyphosate; Aminomethylphosphonic acid; Microscale solid phase extraction; Alumina-coated iron oxide nanoparticles; Capillary electrophoresis; Electrochemiluminescence detection; Guava
Funding
- National Science Council of Taiwan
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A microscale solid-phase extraction (SPE) method using alumina-coated iron oxide nanoparticles (Fe3O4@Al2O3 NPs) as the affinity adsorbent for glyphosate (GLY) and its major metabolite aminomethylphosphonic acid (AMPA) in aqueous solution is reported. One milligram of Fe3O4@Al2O3 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 mu l of 20 mM Na4P2O7 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 mu g g(-1). Total analysis time including sample pretreatment, SPE and CE-ECL was less than 1 h. (C) 2009 Elsevier B.V. All rights reserved.
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