文献类型：期刊文献

英文题名：A ratiometric fluorescence probe for selective detection of sulfite and its application in realistic samples

作者：Sun, Qian[1];Zhang, Weibing[1];Qian, Junhong[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：162

起止页码：107

外文期刊名：TALANTA

收录：;EI(收录号：20164202918035);WOS:【SCI-EXPANDED(收录号:WOS:000389088700015)】；

基金：This work was financially supported by the National Natural Science Foundation of China (NSFC21576085 and 21475044), Shanghai Municipal Natural Science Foundation (15ZR1409000).

语种：英文

外文关键词：Ratiometric fluorescent probe; Coumarin; Sulfite; Long emission wavelength; Bioimaging

摘要：A new fluorescent probe 7-(diethylarnino)-3-((1e,3e)-5-oxo-5-phenylpenta-1,3-dien-1-yl)-2H-claromen-2-one (SPH), based on Michael addition mechanism, was designed and synthesized for selective detection of sulfite. The probe was constructed by incorporating an alpha,beta-unsaturated ketone conjugated with a (CC)-C-= bond into the coumarin fluorophore as a specifical reaction site for sulfite utilizing its nucleophilic property. The extra conjugated (CC)-C-= bond induced obvious red-shifts in both absorption and emission maxima, and remarkably promoted the nucleophilic addition rate. Once treated with sulfite, the solution's color changed from orange to yellow companied with a strong blue-green fluorescence. The ratio of fluorescence intensity at 488 nm and 630 nm (I-488/I-630) was linear with sulfite concentration over the range of 0-80 mu A with a detection limit of 0.23 mu M. High selectivity and good competition of the probe toward sulfite over other anions and thiols enable us to monitor sulfite levels in realistic samples as well as in living HeLa cells.