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(Top) ECD mass spectra (4 scans) of doubly-charged ions of the β-casein tryptic peptide FQSEEQQQTEDELQDK obtained at ECD cathode potentials of (a) −3.34 V (standard) and (b) −9.34 V. (Bottom) ECD mass spectra (7 scans) of doubly-charged ions of FQpSEEQQQTEDELQDK obtained at ECD cathode potentials of (c) −3.34 V (standard) and (d) −12.84 V.
