Spectroscopic study of molecular associations between flavins FAD and RFN and some indole derivatives |
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| Affiliation: | 1. State Key of Bioreactor Engineering, New World Institute of Biotechnology, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Engineering Research Center of Molecular Therapeutics & New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China;1. Guangxi Key Laboratory of Environmental Processes and Remediation in Ecologically Fragile Regions, Guangxi Normal University, 15 Yucai Road, Guilin 541004, PR China;2. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, 15 Yucai Road, Guilin 541004, PR China;1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China;2. National Local Joint Engineering Laboratory of Urban Domestic Wastewater Resource Utilization Technology, Suzhou 215009, PR China;3. Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215009, PR China;4. Tianping College, Suzhou University of Science and Technology, Suzhou 215009, PR China |
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| Abstract: | ![]()
The formation of complexes between two flavins [flavine adenine dinucleotide (FAD) and riboflavin (RFN)] and some indole derivatives has been studied in aqueous solution. The molecular associations have been examined by means of electronic absorption spectra, since in each, a new charge-transfer like band has been located, and also by observing the variation of the fluorescence emission of FAD or RFN on the solutions. The formation constants for the molecular complexes were determined from data of absorption using the Foster—Hammick—Wardley method. The quenching fluorescence phenomena observed for the FAD and RFN were related to the concentration of the indole derivatives and the corresponding quenching constants have been determined. Thermodynamic parameters have been derived from the values of association constants for the molecular complexes at several temperatures. Clear evidence is found for the influence on the stability of these complexes of the different substituent groups in the indole derivatives and the molecular structure of both flavins. |
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