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Chromatograms of: (a) MON standard (100 µg L−1); (b) naturally contaminated maize sample (1637 µg kg−1). Chromatographic separation was carried out using a linear gradient methanol: 25 mM ammonium acetate containing 1.25 mM LaCl3·7H2O; detection by MS/MS (MRM transition m/z 97 >41).
