Table 1. Mass spectrometer fragmentation pattern of nucleoside bases and formamide with their computed correction factor
m/z G A T U C F
151 100
135 5 100
126 100
112 100
111 100
110 20
109 20
108 26
83 12 15
81 7
69 7 6520
55 80
54 17 11
45 100
43 30 11
29 34
17 32
CF4.53.73.63.32.71.6
  • Patterns of nucleoside bases are from the National Institute of Standards and Technology. CF, mass spectrometer correction factor based on the parent ion. A, adenine; C, cytosine; G, guanine; T, thymine; U, uracil; F, formamide. Boldface type indicates molecular weight.