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. Author manuscript; available in PMC: 2019 Oct 1.

Published in final edited form as: Anal Bioanal Chem. 2018 Jul 31;410(26):6881–6889. doi: 10.1007/s00216-018-1288-z

Fig. 2 — MALDI-MS² analysis of Des, Isodes and Labeled-Des- (a) MS² spectra of Des, Labeled-Des and Isodes are shown in a top, middle and bottom panel respectively. The highlighted fragment ions resulted from loss of a side chain of Des and Isodes (m/z 397) and Labeled-Des (m/z 401) were used for the quantification of Des/Isodes. (b) Isotope distribution of the fragment ion (m/z 401) of Labeled-Des and the fragment ion (m/z 397) of Des/Isodes are shown in blue and orange respectively. The result shows two major isotope peaks, m/z 400 and 401, represent greater than 75 percentage of total peak area of the fragment ion (m/z 401)

Fig. 2 — MALDI-MS² analysis of Des, Isodes and Labeled-Des- (a) MS² spectra of Des, Labeled-Des and Isodes are shown in a top, middle and bottom panel respectively. The highlighted fragment ions resulted from loss of a side chain of Des and Isodes (m/z 397) and Labeled-Des (m/z 401) were used for the quantification of Des/Isodes. (b) Isotope distribution of the fragment ion (m/z 401) of Labeled-Des and the fragment ion (m/z 397) of Des/Isodes are shown in blue and orange respectively. The result shows two major isotope peaks, m/z 400 and 401, represent greater than 75 percentage of total peak area of the fragment ion (m/z 401)