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Positional distribution of major fatty acids
in triglycerides
of some plant oils


 

sn

16:0

16:1

18:0

18:1

18:2

18:3

20:0

20:1

22:0

22:1

24:0


Linseed

1
2
3

10.1
1.6
6.0

0.2
0.1
0.3

5.6
0.7
4.0

15.3
16.3
17.0

15.6
21.3
13.2

53.2
59.8
59.4

          


Soya bean

1
2
3

18.2
1.9
12.0

 0.1
0 .1
0.1

5.4
2.7
4. 5

15.9
28.4
25.0

47.8
64.1
48.3

12.9
2.6
10.3

          


Maize

1
2
3

17.9
2.3
13.5

0.3
0.1
0.1

3.2
0.2
2.8

27.5
26.5
30.6

49.8
70.3
51.6

1.2
0.7
1.0

          


Peanut

1
2
3

13.6
1.6
11.0

0.3
0.1
0.3

4.6
0.3
5.1

59.2
58.5
57.3

18.5
38.6
10.0

  

0.7

4.0

1.1
0.3
2.7

1.3
0.2
5.7

  

0.7
0.5
2.8


Sunflower

1
2
3

10.9
1.7
9.0

0.6
0.0
0.5

1.9
4.1
8.7

17.1
36.3
31.2

70
57.8
51.3



         


Olive

1
2
3

13.1
1.4
16.9

0.9
0.7
0.8

2.6

4.2

71.8
82.9
73.9

9.8
14.0
5.1

0.6
0.8
1.3

          


Rapeseed

1
2
3

4.1
0.6
4.3

0.3
0.2
0.3

2.2

3.0

23.1
37.3
16.6

11.1
36.1
4.0

6.4
20.3
2.6

  

16.4
2.0
17.3

1.4

1.2

34.9
3.6
51.0

  

 

The fatty acid profile (in mole%) is given for the three acyl positions of the molecule (1, 2 and 3).

It can be seen that the saturated fatty acids are more abundant at the sn-1 and 3 positions and unsaturated ones at the sn-2 position (except for 18:3 in soya bean). Among monoenes, 18:1 is regularly distributed but 22:1 (erucic acid) and 20:1 are clearly more abundant at the external positions.



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