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Representative chromatograms of blank plasma (1) compared to spiked plasma (2). In panel (A), L-DOPA (quan 198.09 → 152.13 m/z, RT: 0.89 min); in panel (B), LDME (quan 212.50 → 152.13 m/z, RT: 1.53 min); in panel (C), carbidopa (quan 227.07 → 181.11 m/z, RT: 1.44 min); in panel (D), internal standard L-DOPA-D3 (201.05 → 154.39 m/z, RT: 0.85 min). Qualifier ions are described in Table 3.
