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Table 1 Relative percentage of radiation products detected in the mass spectra of l-Leu, l-Ile and l-Val irradiated in vacuum condition

From: Amino acids chemical stability submitted to solid state irradiation: the case study of leucine, isoleucine and valine

Amino acid Loss of small radicals % Addition of radicals to amino acids % Addition of radicals to primary radiation products %
Leucine m/z 88a,b 8.7 m/z 158e 0.1 m/z 101b 1.7
m/z 115e 1.4 m/z 175e 3.8 m/z 171c 1.8
   m/z 186c 0.6 m/z 202c 0.8
     m/z 220c 0.5
     m/z 237c 4.6
     m/z 239c 0.1
     m/z 244e 1.1
     m/z 322c 1.2
     m/z 446e 0.1
  10.1   4.5   11.9
Isoleucine m/z 74d 0.1 m/z 229e 0.5 m/z 101b 0.4
m/z 88a,b 4.2 m/z 244e 1.0 m/z 116b 0.3
m/z 101e 0.9 m/z 343e 0.6 m/z 158c 0.4
m/z 115e 4.8    m/z 170c 0.2
     m/z 171c 1.0
     m/z 202c 0.9
     m/z 223c 0.8
     m/z 239c 0.6
  10.0   2.1   4.6
Valine m/z 59d 6.3 m/z 160e 0.3 m/z 87b 2.3
m/z 74b 3.6 m/z 174c 0.7 m/z 88b 0.8
m/z 101d 1.9 m/z 198e 0.5 m/z 132e 0.3
   m/zz 216e 0.7 m/z 145e 0.2
   m/z 285e 0.8 m/z 213c 0.9
     m/z 307c 0.8
  11.8   3.0   5.3
  1. aThe percentage is the sum of ion m/z 88 and its fragment m/z 71, derived from ESI ionization
  2. bPositive ion mode, low mass range
  3. cPositive ion mode, normal mass range
  4. dNegative ion mode, low mass range
  5. eNegative ion mode, normal mass range