Abstract
Dry stems of Syngonanthus nitens, a plant of the Euriocaulaceae species, present exquisite golden shine, originated from flavonoids residing at S. nitens stem epidermis. We report here on the optical properties of flavonoids extracted, in different solvents, from dry stems of the plant. The extracts were analyzed by UV–Vis absorption and fluorescence emission spectroscopies, and data were obtained in solvents of different polarity and in aqueous media at different pHs. Time-resolved fluorescence experiments, made using single photon detection technique, fluorescence correlation spectroscopy and fluorescence anisotropy measurements were also employed to study flavonoid/solvent and flavonoid/flavonoid interactions. A consistent picture of the S. nitens flavonoid photophysical behavior and their interaction via proton transfer in aqueous suspension is obtained. The results are important to understand the photophysical process involving flavonoids in general.
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