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Molecules 2017, 22(10), 1585; doi:10.3390/molecules22101585

Concentration Effect on Quenching of Chlorophyll a Fluorescence by All-Trans-β-Carotene in Photosynthesis

1
Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
2
Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, China
*
Authors to whom correspondence should be addressed.
Received: 2 August 2017 / Revised: 20 September 2017 / Accepted: 20 September 2017 / Published: 21 September 2017
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Abstract

Absorption, fluorescence spectra of chlorophyll a (Chl-a) and all-trans-β-carotene (β-Car) mixing solution are investigated in different polarity and polarizability solvents. The carotenoids regulate the energy flow in photosynthesis by interaction with chlorophyll, leading to an observable reduction of Chl-a fluorescence. The fluorescence red shifts with the increasing solvent polarizability. The energy transfer in the Chl-a and β-Car system is proposed. The electron transfer should be dominant in quenching Chl-a fluorescence rather than the energy transfer in this system. Polar solvent with large polarizability shows high quenching efficiency. When dissolved in carbon tetrachloride, Chl-a presents red shift of absorption and blue shift of fluorescence spectra with increasing β-Car concentration, which implies a Chl-a conformational change. View Full-Text
Keywords: Chl-a; fluorescence; β-Car; quenching Chl-a; fluorescence; β-Car; quenching
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Chen, C.; Gong, N.; Li, Z.; Sun, C.; Men, Z. Concentration Effect on Quenching of Chlorophyll a Fluorescence by All-Trans-β-Carotene in Photosynthesis. Molecules 2017, 22, 1585.

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