Figure 6

MALDI-TOF MS spectra of the mixture of human IgG and BSA tryptic digests (a) without enrichment, (b) after enrichment by Fe3O4@MPS@PMAC and (c) after enrichment by commercial HILIC (IgG: BSA = 1: 50, w/w, 1 mg/mL); (d) without enrichment, (e) after enrichment by Fe3O4@MPS@PMAC and (f) after enrichment by commercial HILIC (IgG: BSA = 1: 100, w/w, 1 mg/mL).