Table 2.
Percentage of oxidized product ions observed in the ETD spectrum of the doubly charged ion of the oxidized angiotensin I peptide (M+O+2H)2+
| Product Ion | m/zunoxidizeda | m/zoxidizeda | Percentage oxidizedb,c |
|---|---|---|---|
| c2 | 289 | 305 | 0 |
| c3 | 388 | 404 | 0 |
| c4 | 551 | 567 | 0 |
| c5 | 664 | 680 | 0 |
| c7 | 898 | 914 | 66 ± 2 |
| c8 | 1045 | 1061 | 64 ± 1 |
| c9 | 1182 | 1198 | 100 |
| z7 | 910 | 926 | 100 |
| z8 | 1009 | 1025 | 100 |
| z9 | 1165 | 1181 | 100 |
a
These m/z ratios correspond to the nominal m/z ratio of the observed product ions.
b
The percentage oxidized is obtained by dividing the ion abundance of the oxidized product ion by the sum of the oxidized and unoxidized product ions.
c
The error associated with oxidized percentage value corresponds to the standard deviation from at least three separate measurements