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Analytical Investigations of Toxic p-Phenylenediamine (PPD) Levels in Clinical Urine Samples with Special Focus on MALDI-MS/MS

Figure 2

TOF spectrum (pos. mode) for the identification of two PPD metabolites MAPPD (m/z [M+H]+ 151) and DAPPD (m/z [M+H]+ 193) in patient urine.

Comparative control urine did not show any signals at the corresponding m/z values.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0022191.g002