The image below is a positive ionization mode Electrospray ionization-mass spectrum (ESI-MS) spectrum for a peptide, obtained using high resolution mass spectrometry. If ionization occurs through de-protonation (assuming that the mass of a proton is 1.0 Da), what is the neutral mass of the peptide, in Da? 627.271 627.604 100 627.938 | 628.271 628.604 628.938 627.0 628.0 629.0 mass/charge (m/z) 628.271 O 626.271 1878.813 1884.813 % Abundance

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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The image below is a positive ionization mode Electrospray ionization-mass spectrum (ESI-MS)
spectrum for a peptide, obtained using high resolution mass spectrometry. If ionization occurs
through de-protonation (assuming that the mass of a proton is 1.0 Da), what is the neutral mass of
the peptide, in Da?
627.271 627.604
100 -
627.938
628.271
628.604
628.938
627.0
628.0
629.0
mass/charge (m/z)
628.271
626.271
1878.813
O 1884.813
% Abundance
Transcribed Image Text:The image below is a positive ionization mode Electrospray ionization-mass spectrum (ESI-MS) spectrum for a peptide, obtained using high resolution mass spectrometry. If ionization occurs through de-protonation (assuming that the mass of a proton is 1.0 Da), what is the neutral mass of the peptide, in Da? 627.271 627.604 100 - 627.938 628.271 628.604 628.938 627.0 628.0 629.0 mass/charge (m/z) 628.271 626.271 1878.813 O 1884.813 % Abundance
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