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Amino acid  Target ion (m/z) Reference ions (m/z)

Ala

116

73, 147

Gly of di-trimethylsilyl derivative

102

73, 147

Val

144

73, 218

Nor

144

73, 218

Leu

158

73, 102

Ile

158

73, 218

Pro

142

73, 216

Gly of tri-trimethylsilyl derivative

174

73, 248

Ser

304

218, 73

Thr

73

218, 291

Asp

232

156, 73

Glu

246

73, 128

Phe

218

192, 73

Lys

174

156, 73

Tyr

218

179, 280

Cyt

218

147, 73


Table 1. Target and reference ions for SIM mode as characteristics mass fragments of the 14 amino acids.