Dual enzyme activated fluorescein based fluorescent probe
Maria L. Odyniec , Jordan E. Gardiner , Adam C. Sedgwick , Xiao-Peng He , Steven D. Bull , Tony D. James
Front. Chem. Sci. Eng. ›› 2020, Vol. 14 ›› Issue (1) : 117 -121.
Dual enzyme activated fluorescein based fluorescent probe
A simple dual analyte fluorescein-based probe ( PF3-Glc) was synthesised containing β-glucosidase ( β-glc) and hydrogen peroxide (H 2O 2) trigger units. The presence of β-glc, resulted in fragmentation of the parent molecule releasing glucose and the slightly fluorescent mono-boronate fluorescein ( PF3). Subsequently, in the presence of glucose oxidase (GOx), the released glucose was catalytically converted to D-glucono- δ-lactone, which produced H 2O 2 as a by-product. The GOx-produced H 2O 2, resulted in classic H 2O 2-mediated boronate oxidation and the release of the highly emissive fluorophore, fluorescein. This unique cascade reaction lead to an 80-fold increase in fluorescence intensity.
chemosensors / dual-activation / GOx / fluorescence / β-glucosidase / molecular logic
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