Fluorescent microsphere fiber optic microsensor array for direct iodide detection at low picomolar concentrations

Abstract

Fluorescent optode microspheres doped with the halide-selective receptor [9]mercuracarborand-3 and a lipophilic pH fluoroionophore were found to exhibit picomolar limits of detection to iodide at pH 3.5, and were used to monitor the precipitation of iodide by silver ions at subnanomolar concentrations, just above their calculated solubility.

Photoinduced triplet-state electron transfer of platinum porphyrin: a one-step direct method for sensing iodide with an unprecedented detection limit

“…[12][13][14] In addition to its environmental and biological importance, iodide is a key component of a redox couple oen used in solar-energyharvesting systems. 15 Various methods can be used for the determination of iodide, 16 including photoluminescence, [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] colorimetric detection, [33][34][35][36][37] time-resolved absorption techniques, 38 mass spectrometry, [39][40][41] chromatography, 42 Raman scattering 43,44 and electrochemical proling. 45,46 However, because of its large size and weakly basic nature, the binding capacity of iodide is the weakest among the halide ions.…”

“…Researchers have recently demonstrated great interest in the development of photoluminescence-based methods for the highly sensitive, rapid and selective determination of iodide. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] However, the complex preparation of the uorophores, their low hydrophilicity, and the fact that the multistep determination of iodide usually involves a toxic reagent (Hg) have hampered the widespread application of photoluminescence-based methods. In this study, we report a 5,10,15,20-tetra(1-methyl-4-pyridino)-porphyrin Pt(II) tetrachloride (Pt(II)TMPyP)-based photoluminescence sensor for the ultra-sensitive, easy, rapid, environmentally friendly and economical determination of iodide.…”

Advancing Membrane Electrodes and Optical Ion Sensors

“…This is now likely to improve with the advent of photodynamic optical sensors that is the topic of current research. [60] Right: correspondingresponseofasimilarlyformulatedandoptimizediodide-selectiveelectrode. [61] Withthepotentiometricsensor,ionfluxescannotbecompletelyeliminatedandhenceresultina significantlyworsedetectionlimit.…”

“…The group of Kopelman pioneered the concept of intracellular detection with submicron-sized optical sensing particles, [63] which was an elegant extension on their earlier work with miniature optical fiber sensor probes. [64] Some of these beads mimicked the composition of classical hydrogel based indicator assays, but others were based on the ion optode principles discussed above.…”

Microfluidic ion-sensing devices

“…Such microspheres have been utilized for silver and iodide analysis after immobilizing them on the tips of etched optical fibers [85,86]. More importantly, the particles also have been employed for the analysis of sodium, potassium, and calcium in a flow cytometry set-up [83,87,88].…”