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. 2023 Feb 23;12(3):559. doi: 10.3390/antiox12030559

Figure 2.

Figure 2

UPLC-MS Data for Positive Control Mpro Substrate. Depicted are the extracted ion chromatograms for the samples with and without protease (top) and the mass spectra (bottom) for (A) the Intact Peptide, (B) the P Fragment, and (C) the P′ Fragment. The normalization levels of the base peaks for the P and P′ fragments were 2.39 × 108 and 3.99 × 108, respectively. High resolution mass spectrometric analysis corroborates the identities of each base peak in the corresponding extracted ion chromatogram.