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Composition of tomatoes and tomato products in antioxidants (WG1) page 62
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all-trans lycopene
15-cis lycopene
13-cis lycopene
11-cis lycopene
9-cis lycopene
7-cis lycopene
5-cis lycopene
7.1.3.2 Occurrence
7,9,7',9'-cis-lycopene
Figure 8 : Natural lycopene geometrical isomers.
All-trans lycopene is the predominant isomer in tomatoes and tomato products (~95%)
(Clinton et al. 1996), 15-cis, 13-cis, 9-cis and 5-cis-lycopene have been found in human
serum, making up approximatively half the total lycopene content, sometimes even more. The
predominant cis isomer is the 5-cis-lycopene. An even greater proportion, approximatively