Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 936, Issue 1-2, Pages 59-69Publisher
ELSEVIER
DOI: 10.1016/S0021-9673(01)00945-1
Keywords
geometric isomers; positional isomers; hydroxycarotenoids; carotenoids; lycopenes; prolycopene
Ask authors/readers for more resources
Selectivity towards geometric isomers is a superior feature of a C-30 polymeric stationary phase. Therefore, lycopene isomers synthesized in Escherichia coli transformants by catalysis of divers carotene desaturases were separated on this stationary phase. Due to their spectral characteristics and by co-chromatography with nuclear magnetic resonance-characterized carotene standards, some of them could be identified. Most of the lycopene isomers were cyclized by lycopene cyclase yielding mainly 9Z, 13Z and all-E beta -carotene. In contrast, 7,9,7',9'Z prolycopene is accumulating since it cannot be converted by this enzyme. Finally several acyclic hydroxycarotenoids with a chain of 30, 40 and 45 carbon atoms differing in the length of the polyene chain from 9 to 13 were separated on the C-30 stationary phase. Longer retention times were observed when the length of the molecule increased and also when the conjugated double bond system was extended. Corresponding monocyclic carotenoids were less retained on the C-30 stationary phase and derivatives with an epsilon -ionone end group eluted earlier than with a beta -end group. (C) 2001 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available