Traditional fluorescence switching molecules achieving the state change between on and off states commonly based on UV irradiation. However
it is worth noting that UV irradiation is harmful to both the cancer cells and the normal cells. To achieve fluorescence switching under visible wavelength and avoid complicate molecular design
a fluorophore of 2
4
5
6-tetrakis(carbazol-9-yl)-1
3-dicyanobenzene (4CzIPN) and a quencher of diarylethene (DAE) were physically incorporated within the biocompatible block copolymer poly(lactic-co-glycolic acid)-
b
-poly(ethylene glycol) (PLGA-
b
-PEG) to form 4CzIPN-DAE nanoparticles (NPs) through flash nanoprecipitation (FNP). By using the FNP method
the NPs were prepared within milliseconds in a confined impingement jets dilution (CIJ-D) mixer. Quenching and recovery of fluorescence could achieve in the presence of DAE under 475 nm and 560 nm irradiation. Appropriate structure and fluorescent properties of the nanoparticles can be tuned by external conditions for their efficient fluorescence resonance energy transfer (FRET) in a kinetic stabilization process. This NPs formation process was further optimized by varying the dilution
ratio
Reynolds number (
Re
) and polymer concentration to modulate the mixing and particle nucleation and growth process. The size and fluorescence switching properties of the NPs were systematically investigated in solution and in cellular uptake experiments. This work is anticipated to provide a simple and highly effective engineering strategy for the modulation of fluorescence switching nanoparticles and beneficial to its engineering application.
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相关作者
Hongyan Shen
Youzhi Liu
Zhao Wang
Yu Zhu
Sun Man
Xu Zhengtao
Li Senlin
Sun Qian
相关机构
Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, College of Chemical Engineering and Environment, North University of China
State Key Laboratory of Chemical Engineering, School of Chemical Engineering, Tianjin University
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology
Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology
Quzhou Innovation Institute for Chemical Engineering and Materials