Pantopoulos K, Porwal SK, Tartakoff A, Devireddy L. Construction of reversible enol-to-keto-to-enol tautomerization covalent organic polymer for sensitive, selective and multi-channel detection of iron (III). Zhou H, Zang X, Hu Q, Li Y, Fang Y, Cui B.
The role of iron and reactive oxygen species in cell death. Two to tango: Regulation of mammalian iron metabolism. Hentze MW, Muckenthaler MU, Galy B, Camaschella C. Graphical AbstractĪn upconversion luminescence (UCL) nanosensor based on the inner-filter effect (IFE) between upconversion nanoparticles (UCNPs) and Fe 3+-hypocrellin B (HB) complex for the detection of Fe 3+ and phosphate ion has been proposed, which is promising to be a convenient and sensitive assay for monitoring Fe 3+ and phosphate ion in different environments and biological systems. Furthermore, the real sample detection shows that the proposed nanaosensor has a great potential in environmental and biological systems.
The results for selectivity, precision, and recovery test are also satisfactory. For the detections of Fe 3+, the linear range is 10–600 μM with a limit of detection (LOD) of 2.62 μM, and for Pi, the linear range is 5–100 μM with a LOD of 1.25 μM. So, with the specific recognition ability of HB for Fe 3+ and the competitive complexation of Pi for Fe 3+, the proposed nanosensor utilizes the UCL change to achieve the detection of the targets. By adding Fe 3+ and Pi, the UCNPs-HB system produces the red-shift change of absorption spectrum, which leads to the “on–off-on” process of IFE.
Fe 3+-HB complex has strong absorption band (450–650 nm), which overlaps with the green emission peak of UCNPs at 545 nm. In this work, an upconversion luminescence (UCL) nanosensor for fast detection of ferric ion (Fe 3+) and phosphate ion (Pi) is developed based on the inner-filter effect (IFE) between NaYF 4:Yb/Er upconversion nanoparticles (UCNPs) and Fe 3+-hypocrellin B (HB) complex.
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