A novel fluorescence “on-off-on” peptide-based chemosensor for simultaneous detection of Cu2+, Ag+ and S2−

A Novel Ruthenium(II) Polypyridyl Complex Bearing 1,8-Naphthyridine as a High Selectivity and Sensitivity Fluorescent Chemosensor for Cu2+ and Fe3+ Ions

“…As shown in Figure 5 and Figure 6, the fluorescence intensity of the complex gradually decreased at 612 nm with an increasing concentration of Cu 2+ and Fe 3+ ions from 0 to 1.5 equivalents. The metal ions combined with the complex [{Ru(bpy) 2 } 2 (μ 2 -H 2 L)](PF 6 ) 4 , which made the electron transfer process easier than in the complex [{Ru(bpy) 2 } 2 (μ 2 -H 2 L)](PF 6 ) 4 [46,47,48]. There was a good linear relationship between the fluorescence intensity and the concentration of Cu 2+ ions with the correlation coefficient of R = 0.9987 when the concentration of Cu 2+ varied from 5 × 10 −7 mol/L to 10 −5 mol/L (Figure 7).…”

“…There was a linear relationship between the fluorescence intensity and the concentration of Fe 3+ ions with the correlation coefficient of R = 0.9501 when the concentration of Fe 3+ varied from 6.25 × 10 −6 mol/L to 8.0 × 10 −6 mol/L (Figure 8). Furthermore, the equation: 3σ/k (where σ is the standard deviation of blank measurements, k is the slope between intensity vs. the concentration of ions) was used to obtain the detection limit of Cu 2+ and Fe 3+ [48,49]. The detection limits of Cu 2+ and Fe 3+ were 39.9 nmol/L and 6.68 nmol/L, which were far lower than the maximum allowable level of the WHO for drinking water.…”

Ultrashort Peptide Theranostic Nanoparticles by Microfluidic-Assisted Rapid Solvent Exchange

“…[1] Therefore, peptidebased nanomaterials have been widely used as tissue engineering scaffolds, [2] biosensors, [3][4][5] drug delivery vehicles, [6] and bioimaging probes. [7] Peptides can be a viable drug delivery vehicle alternative to lipid or polymeric micelles vesicles, [8,9] due to their unique characteristic of recognition by biological systems (e.g. Arg-Gly-Asp(RGD) is a well-known integrin-binding ligand for cell adhesion).…”

Simultaneous Detection of Cu2+ and Co2+ by a Water‐Soluble Carboxamide‐Based Colorimetric Chemosensor

“…Several analytical tools like electrochemical method, atomic absorption‐emission spectrometry, and fluorescence technique have been developed for analyzing Cu 2+ and Co 2+ . However, some of them are complex, expensive, and difficult to use . On the other hand, colorimetric methods that the target ion can be easily detected through the color change, have advantages such as high specificity, simplicity, and reasonable economics .…”