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. 2008 Apr 25;95(3):1371–1381. doi: 10.1529/biophysj.107.122002

TABLE 2.

Accurate monoisotopic mass determination of carbamyl adducts (n = 0 to 2) of the (Pro-Pro-Gly)10 cross-linked trimer

n Formula Calculated monoisotopic m/z (z = 6) Observed m/z* Calculated m/z Error (ppm)
0 C360 H522 N90 O93 1265.6475 1266.1540 1266.1490 +3.95
1 C361 H523 N91 O94 1272.8152 1273.4885 1273.4837 +3.77
2 C362 H524 N92 O95 1279.9828 1280.6560 1280.6514 +3.59
*

The accuracy of the observed m/z values was determined on the major isotopic peak of the +6 charge state in the spectrum rather than the low abundance monoisotopic mass to obtain a better estimate of the measurement error.