Skip to main content
. 2011 Aug 4;6(8):e22191. doi: 10.1371/journal.pone.0022191

Figure 4. Calibration curve of PPD (A) on the MALDI-MS/MS system (50–1000 µmol/L) and (B) on the HPLC-UV system (150–1000 µmol/L).

Figure 4

Graphs shows the mean values of (A) 5 and (B) 3 independent measurements and the corresponding r2 value. Mean +/− SEM.