Fig. 5: Amino acid ion emission pH.
From: Nanopore ion sources deliver individual ions of amino acids and peptides directly into high vacuum
a Normalized mass spectra of 100 mM Histidine and 24 mM NaI/NaOH in aqueous solution at pH 5.5 (darker solid curve) and 8.5 (lighter dashed curve) respectively. b Normalized mass spectra of 100 mM Arginine and 50 mM NaI at pH 9.1 (darker solid curve) and 10.8 (lighter dashed curve) respectively. In both panels, the vertical dashed line shows the m/z value used in the analysis to separate the amino acid signal from sodium signal. Source data are provided as a Source Data file.
