A fluorescent turn-on probe based on benzo[e]indolium for bisulfite through 1,4-addition reaction

A near-infrared fluorescent probe for rapid, colorimetric and ratiometric detection of bisulfite in food, serum, and living cells

“…Consequently, ratiometric probes with NIR fluorescent changes are very attractive to sense and detect important molecules of interest. To date, several fluorescent probes for HSO 3 − /SO 3 2− have been developed based on different approaches such as complexation with amines [15], the selective deprotection of levulinate group [16][17][18][19], the selective reaction with aldehyde [20][21][22][23][24][25][26] and Michael-type additions [27][28][29][30][31][32][33][34][35], however, many of them are intensity-based, in which factors such as instrumental efficiency, the probe concentration, and environmental conditions can interfere with signal output. In addition, almost all of these probes showed emissions only in the visible region, and some of them need to use ultraviolet excitation, which limited their biological applications.…”

Rapidly responsive and highly selective fluorescent probe for sulfite detection in real samples and living cells

“…The probes have shortcomings, including low sensitivity or long response time for levulinate probes, and poor performance under pure water for other probe types. In contrast, Michael addition-type probes are more regnant than other probes, and they produce colorimetric and fluorescent dual-response reaction under mild conditions [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

An effective ICT-based and ratiometric fluorescent probe for sensing sulfite

“…These traditional methods are usually time consuming and need sample pre-treatment and expensive equipment [18][19][20][21][22][23].…”