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Table 1 Mass spectral characteristics of fourteen wax ester prototype groups

From: Wax ester profiling of seed oil by nano-electrospray ionization tandem mass spectrometry

Prototype group Standards Product ion DP EP CE CRF
# C DB DB
   OH COOH       
1 32-36 0 0 16:0/16:0 [RCO2H2]+ 58 4.5 26 0.1753
16:0/18:0
18:0/16:0
18:0/18:0
2 32-36 1 0 18:1/16:0 [RCO2H2]+ 58 4.5 26 0.0633
18:1/18:0
3 32-36 > 1 0 18:2/18:0 [RCO2H2]+ 48.5 5.5 28 0.0209
18:3/18:0
4 32-36 0 1 16:0/18:1 [RCO2H2]+ 52 5 23.5 0.0601
18:0/18:1
5 32-36 0 > 1 18:0/18:2 RCO+ 55.5 5 23.5 0.0675
18:0/18:3      
6 32-36 1 ≥ 1 18:1/18:1 RCO+ 43 5.5 25 0.0365
7 32-36 > 1 ≥ 1 18:2/18:1 RCO+ 43 5.5 25 0.0182
18:2/18:2
18:2/18:3
8 38-64 0 0 22:0/20:0 [RCO2H2]+ 55 6 29 0.1482
22:0/22:0
22:0/24:0
24:0/24:0
9 38-64 1 0 20:1/22:0 [RCO2H2]+ 55 6 29 0.0655
22:1/22:0
10 38-64 > 1 0 18:3/22:0 [RCO2H2]+ 51 6 29.5 0.0149
11 38-64 0 1 22:0/16:1 [RCO2H2]+ 53 5 26 0.0568
20:0/18:1
22:0/18:1
12 38-64 0 > 1 22:0/18:2 RCO+ 50 5.5 25 0.0606
22:0/18:3
13 38-64 1 ≥ 1 22:1/22:1 RCO+ 52.5 6.5 27 0.0317
20:1/20:1
22:1/20:2
14 38-64 > 1 ≥ 1 20:2/22:1 RCO+ 52.5 6.5 27 0.0119
     20:2/20:2      
  1. Abbreviations: C total carbon number, DB OH total double bonds in fatty alcohol moiety, DB COOH total double bonds in fatty acid moiety, DP Declustering potential, EP Entrance potential, CE Collision energy, CRF Calibration response factor.