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Table 3 Major ions observed by positive ESI-MS of amide and amide-ester peaks and the major fragments detected by LC-MS-MS of these two compounds

From: Environmentally evaluated HPLC-ELSD method to monitor enzymatic synthesis of a non-ionic surfactant

Compound m/z Major fragments
Amide (M = C 19 H 39 NO 6 ) 377  
  [M + H]+ 378 360, 196, 78
  [M + Na]+ 400 382
  [M + H–H20]+ 360 178, 164
Amide-ester (M = C 31 H 61 NO 7 ) 559  
  [M + H]+ 560 360, 542, 178
  [M + Na]+ 582  
  [M + H–H20]+ 542 360
  [2 M + Na]+ 1141 582