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ESI Adduct Ions

This list of monoisotopic exact masses of ESI molecular ion adducts was obtained from the Metabolomics Fiehn Lab at UC Davis. The Result column shows an example calculation when M is Taxol, MW  = 853.33089

Positive Ion Mode

Ion NameIon MassChargeMultMassResult
M+3H
M+2H+Na
M+H+2Na
M+3Na
M+2H
M+H+NH4
M+H+Na
M+H+K
M+ACN+2H
M+2Na
M+2ACN+2H
M+3ACN+2H
M+H
M+NH4
M+Na
M+CH3OH+H
M+K
M+ACN+H
M+2Na-H
M+IsoProp+H
M+ACN+Na
M+2K+H
M+DMSO+H
M+2ACN+H
M+IsoProp+Na+H
2M+H
2M+NH4
2M+Na
2M+3H2O+2H
2M+K
2M+ACN+H
2M+ACN+Na
M/3 + 1.007276
M/3 + 8.334590
M/3 + 15.7661904
M/3 + 22.989218
M/2 + 1.007276
M/2 + 9.520550
M/2 + 11.998247
M/2 + 19.985217
M/2 + 21.520550
M/2 + 22.989218
M/2 + 42.033823
M/2 + 62.547097
M + 1.007276
M + 18.033823
M + 22.989218
M + 33.033489
M + 38.963158
M + 42.033823
M + 44.971160
M + 61.06534
M + 64.015765
M + 76.919040
M + 79.02122
M + 83.060370
M + 84.05511
2M + 1.007276
2M + 18.033823
2M + 22.989218
2M + 28.02312
2M + 38.963158
2M + 42.033823
2M + 64.015765
3+
3+
3+
3+
2+
2+
2+
2+
2+
2+
2+
2+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
1+
2+
1+
1+
1+
0.33
0.33
0.33
0.33
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
1.007276
8.33459
15.76619
22.989218
1.007276
9.52055
11.998247
19.985217
21.52055
22.989218
42.033823
62.547097
1.007276
18.033823
22.989218
33.033489
38.963158
42.033823
44.97116
61.06534
64.015765
76.91904
79.02122
83.06037
84.05511
1.007276
18.033823
22.989218
28.02312
38.963158
42.033823
64.015765
285.450906
292.77822
300.20982
307.432848
427.672721
436.185995
438.663692
446.650662
448.185995
449.654663
468.699268
489.212542
854.338166
871.364713
876.320108
886.364379
892.294048
895.364713
898.30205
914.39623
917.346655
930.24993
932.35211
936.39126
937.386
1707.669056
1724.695603
1729.650998
1734.6849
1745.624938
1748.695603
1770.677545

Negative Ion Mode

Ion NameIon MassChargeMultMassResult
M-3H
M-2H
M-H2O-H
M-H
M+Na-2H
M+Cl
M+K-2H
M+FA-H
M+Hac-H
M+Br
M+TFA-H
2M-H
2M+FA-H
2M+Hac-H
3M-H
M/3 – 1.007276
M/2 – 1.007276
M- 19.01839
M – 1.007276
M + 20.974666
M + 34.969402
M + 36.948606
M + 44.998201
M + 59.013851
M + 78.918885
M + 112.985586
2M – 1.007276
2M + 44.998201
2M + 59.013851
3M – 1.007276
3-
2-
1-
1-
1-
1-
1-
1-
1-
1-
1-
1-
1-
1-
1-
0.33
0.5
1
1
1
1
1
1
1
1
1
2
2
2
3
-1.007276
-1.007276
-19.01839
-1.007276
20.974666
34.969402
36.948606
44.998201
59.013851
78.918885
112.985586
-1.007276
44.998201
59.013851
1.007276
283.436354
425.658169
834.3125
852.323614
874.305556
888.300292
890.279496
898.329091
912.344741
932.249775
966.316476
1705.654504
1751.659981
1765.675631
2560.999946