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Fluorescence emission spectra of α-glucosidase-quercetagetin complexes (a), α-amylase-quercetagetin complexes (b) and lipase-quercetagetin complexes (c) at different concentrations of quercetagetin. Insets: Plot of F 0/F versus [quercetagetin] as per Eq. (2) (top); log[(F 0−F)/F] versus log [quercetagetin] as per Eq. (3) (bottom). (a-g) the quercetagetin concentration from 0 to 60 μM.
