| Literature DB >> 31367383 |
Jianbo Wang1,2, Shuai Xia1, Jianheng Bi1, Yibin Zhang1, Mingxi Fang1, Rudy L Luck1, Yanbo Zeng1,2, Tzu-Ho Chen3,4, Hsien-Ming Lee3, Haiying Liu1.
Abstract
Three near-infrared ratiometric fluorescent probes (A-C) based on TBET and FRET near-infrared rhodamine acceptors with different pK a values were designed and synthesized to achieve sensitive ratiometric visualization of pH variations in lysosomes in visible and near-infrared channels. Tetraphenylethene (TPE) was bonded to near-infrared rhodamine dyes through short electrical π -conjugation linkers to prevent an aggregation-caused quenching (ACQ) effect and allow highly efficient energy transfer of up to 98.9% from TPE donors to rhodamine acceptors. Probes A-C respond to pH variation from 7.4 to 3.0 in both buffer solutions and live cells with significant decreases of donor fluorescence and concomitant extraordinary increases of rhodamine acceptor fluorescence because of highly efficient energy transfer. In addition, probe C is capable of determining pH fluctuations in live cells treated with chloroquine. The probes show good photostability, excellent cell membrane permeability, high selectivity to pH, and two well-resolved emission peaks to ensure accurately comparative and quantitative analyses of intracellular pH changes.Entities:
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Year: 2018 PMID: 31367383 PMCID: PMC6668629 DOI: 10.1039/C8TB01524D
Source DB: PubMed Journal: J Mater Chem B ISSN: 2050-750X Impact factor: 6.331