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(A) Negative ion mode total ion chromatogram (TIC). (B) Positive ion mode TIC. (C) Base peak ion chromatography and corresponding compounds. 1: l-Carnitine; 2: LPC 16:0; 3: Coumaroyl tyramine; 4: Tetramethylpyrazine; 5: LPC 18:1; 6: Choline; 7: (S,S)-Butane-2,3-diol; 8: Scopoletin.
