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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.