Fig. 1.

The signal (ion counts) recorded for all 24 synthetic peptides (see Table 1 for peptide reference) as a function of the amounts loaded on the chromatography column. 100 amol, 1 fmol, 10 fmol, 100 fmol and 1 pmol of each peptide was loaded onto the column for determination of the limit of detection (LOD) and the linear dynamic range (LDR). LDR is not reported for the peptides with less than three data points. R² is used as a measure of linearity.