CAROTENOIDS REFERENCE PAGE CAROTENOIDS (ka rot e noid) n -any of a class of yellow- to deep-red pigments, such as carotenes, occurring in many plant tissues and some animal fats. They are non-polar and therefore soluable in organic solvents and fats but not soluable in water.

Carotenoids general chemical structure as represented by Beta-carotene;
caroteniodyellow-orange pigment in carrots

or Alpha-carotene formula alpha-carotene
Only difference is position of one double bond, can you find it?

Other examples ;

Lycopene formula lycopene red pigment in tomattos

Lutein formula lutein yellow pigment in merigolds.

Zeaxanthin formula zeaxanthin near twin of lutein.
In fact you could call zeaxanthin Alpha-lutein, because lutein is to Beta-carotene
as zeaxanthin is to Alpha-carotene.

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