Abstract
Ultrasensitive ratiometric fluorescent pH probes based on dual dye-labeled pH-responsive diblock copolymer micellar scaffold are constructed. The pH-sensitive emitting nature of BTPE dyes and emission turn-on of CMA moieties triggered by pH-actuated micelle-to-unimer of diblock scaffold synergistically contribute to the observed ≈250-fold changes of BTPE/CMA emission intensity ratios in the whole pH range. Two-photon ratiometric fluorescent pH mapping of intracellular gradients subjected by pH-responsive micellar nanoparticles in their endocytic pathway has been thus achieved.
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