Figure 1. The figure depicts the total and extracted ion chromatograms of the analytes quantified in the adopted method: A) acetyl choline, B) γ-aminobutyric acid (GABA), C) L-glutamate, D) 1-methyl histamine, E) histamine, F) N-acetyl serotonin, G) serotonin, H) dopamine, I) adrenaline, J) L-DOPA, and K) noradrenaline.