Chapter 10 lecture notes

Wavelengths example chlorophyll a pigment in

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Unformatted text preview: c>on in photoprotec>on •  Carotenoids are found in health food products as phytochemicals that have an>oxidant proper>es •  Plants can produce all the an>oxidants that they require Yellow xanthophyll carotenoids •  animals must obtain them from their diet Key Points: •  Vegetable and fruit have unique brilliant colors due to specific carotenoids. •  these chemicals provide photoprotection which may decrease the risk of some diseases, particularly certain cancers and eye disease ExcitaBon of isolated chlorophyll molecule: closed system Orbital with more poten0al energy Energy Difference Fluorescence A par>cular chlorophyll pigments (molecules) will absorb only photons whose energy is exactly equal to the difference between the ground state and the excited state Different pigments of chlorophyll will absorb photons corresponding to par>cular wavelengths Example: Chlorophyll a pigment in Photosystem II – absorbs light at a wavelength of 680 nm – called P680 Chlorophyll a pigment in Photosystem I – absorbs light at a wavelength of 700 nm – called P700 Remember: a plant leaf exists in an open system. the energy released when chlorophyll electrons are excited by photon absorption is used to power the reactions of photosynthesis ExcitaBon of chlorophyll within a...
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