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Processing and Bioavailability (WG2) page 69
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These findings suggests that β-carotene has a sparing effect on lycopene and that if this is
the case other ‘interactions’ in vivo may also occur which will need to be considered when
looking at plasma carotenoid profiles and dietary habits.
A general problem investigating the isomer pattern of carotenoids is the lack of reference
substances. Besides the (E)-isomers of the main carotenoids, which are commercially
available, there is no (Z)-isomer available. To study the isomerisation in food and plasma, a
source of highly purified carotenoid isomers is needed.