Figure 7

Quantitative Comparison of Phosphopeptide Enrichment Methods. Histogram distributions of peak heights for unique and overlapping phosphopeptides detected in conjunction with (a) (TiO2)-, and (b) (Nb2O5)-based enrichment. The intensity distributions for phosphopeptides assigned uniquely to either metal oxide did not differ significantly from the intensity distributions for commonly detected phosphopeptides, indicating that the unique precursors were not confined to low signal-to-noise regions. Reprinted from [23] by permission from the American Chemical Society.