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5, while the second dimension employed a C18 superficially porous particle column and a mobile phase composed of acetonitrile and phosphoric acid aqueous solution, pH 2.5 (793, v/v). The total analysis time was 8 min, and a resolution of 1.72 was achieved between the nearest peaks (tyramine and phenylethylamine). Linear responses were obtained within 10 and 50 mg L-1 (r 0.997), with detection limits estimated at 2.7, 7.7, 1.9, and 0.3 mg L-1, for histamine, tyramine, phenylethylamine, and tryptamine, respectively, and a coefficient o
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