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. Author manuscript; available in PMC: 2007 May 2.
Published in final edited form as: J Am Soc Mass Spectrom. 2006 Nov 27;18(3):493–501. doi: 10.1016/j.jasms.2006.10.019

Table 1.

List of m/z values and calculated neutral and observed masses.

Neutral Masses in Da Expected m/z Observed m/z Observed Mass Delta Mass in Da Mass Errors in mDa

Peptide-1 SEVAHRFKC 1075.5232 538.7689 (+2) 538.7688 (+2) 1E-04 0.1
Peptide-2 CHWKQNDEQM 1317.5229 659.7688 (+2) 659.7681 (+2) 7E-04 0.7
Peptide-2 (Ox) CHWKQNDEQM 1333.5178 ------------------ ------------------ ------------ ------------ ------------
Iodoacetamide (IA) [added mass] 58.0292 ------------------ ------------------ ------------ ------------
3-maleimidopropionic acid (MP) 169.0375 ------------------ ------------------ ------------ ------------ ------------
4-vinylpyridine (VP) 105.0578 ------------------ ------------------ ------------ ------------ ------------
Peptide-1+IA+[O] 1148.5395 1149.5468 (+1)
575.2771 (+2)
575.2794(+2) ------------ 2.3E-03 2.3
Peptide-1+MP+[O] 1260.5556 1261.5629 (+1)
631.2851 (+2)
631.2848 (+2) ------------ 3E-04 0.3
Peptide-1+VP+[O] 1196.5759 1197.5832 (+1)
599.2953 (+1)
599.2939 (+2) 1.4E-03 1.4
Peptide-2 (Ox)+MP+[O] 1518.5502 1519.5575 (+1)
760.2824 (+2)
760.2837 (+2) 1.3E-03 1.3
RSOH (IA) 107.0041 ------------------ ------------------ 107.0048 7E-04 0.7
R+ H2O (MP) 187.0480 ------------------ ------------------ 187.0470
187.0484
1E-03
4E-04
1.0
0.4
R+ H2O (VP) 123.0683 ------------------ ------------------ 123.0698 1.5E-03 1.5
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