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

Published in final edited form as: J Am Soc Mass Spectrom. 2018 Jun 25;29(9):1901–1907. doi: 10.1007/s13361-018-1994-y

Table 1.

The mass error of all oxidized and unoxidized suspected misidentified COSMC peptides.

Peptide	charge	Theoretical peptide mass	Actual Peptide mass	Mass error (ppm)
(161- KDPSQPFYLGHTIK-174)	3	544.291	544.292	−0.673
(161- KDPSQPFYLGHTIK-174)+1O	3	549.622	549.6234	−0.788
(161- KDPSQPFYLGHTIK-174)+2O	3	554.954	554.955	−1.261
(161- KDPSQPFYLGHTIK-174)+3O	3	560.285	Not detected	N/A
(161- KDPSQPFYLGHTIK-174)+4O	3	565.616	565.61	12.316
(175-SGDLEYVGMEGGIVLSVESMK-196)	2	1100.529	1100.531	−1.135
(175-SGDLEYVGMEGGIVLSVESMK-196)+1O	2	1108.526	1108.529	−2.029
(175-SGDLEYVGMEGGIVLSVESMK-196)+2O	2	1116.523	Not detected	N/A
(175-SGDLEYVGMEGGIVLSVESMK-196)+3O	2	1124.520	1124.510	9.559