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. 2020 Feb 26;11:1049. doi: 10.1038/s41467-020-14877-x

Fig. 4. Mass spectra of myoglobin digestion with various methods.

Fig. 4

a Commercial ESI-MS (LTQ Orbitrap Elite, Thermo Scientific), b bulk phase at 37 °C for 14 h, followed by analysis with commercial ESI-MS, and ESSI-MS applied with c a positive high voltage (+3 kV), and d a negative high voltage (−3 kV). Magenta asterisks denote the peptide fragments, and blue #s mark undigested myoglobin peaks.