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Another pigment found in the leaves of many plants is carotene. Carotene absorbs blue-green and blue light. The light reflected from carotene appears yellow. Carotene is also a large molecule (C 40 H 36) contained in the chloroplasts of many plants.
There are over 600 known carotenoids; they are split into two classes, xanthophylls (which contain oxygen) and carotenes (which are purely hydrocarbons, and contain no oxygen). All carotenoids are tetraterpenoids, meaning that they are produced from 8 isoprene molecules and contain 40 carbon atoms.In general, carotenoids absorb wavelengths ranging from 400-550 nanometers (violet to green light). Carotenoids with molecules containing oxygen, such as lutein and zeaxanthin, are known as xanthophylls. 2  The unoxygenated (oxygen free) carotenoids such as Î±-carotene, Î²-carotene, and lycopene, are known as carotenes.