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a Molecular structure of the amido black 10B. b Coordination interaction between Cr³⁺ and amido black 10B. c Schematic illustration of the colorimetric detection of Cr³⁺ based on amido black 10B-stabilized AgNPs
Source publication
Here, we report a highly stable and sensitive colorimetric assay for Cr³⁺ based on amido black 10B-stabilized silver nanoparticles (AgNPs) as the probes. The detection mechanism is that the coordination interaction between Cr³⁺ and amido black 10B on the surface of AgNPs causes the cross-linking/aggregation of amido black-stabilized AgNPs, generati...
Citations
... Silver nanoparticles (AgNPs) is highly sensitive and accurate visual biosensor for detection of different organic and inorganic compounds. The interaction between AgNPs and organic/inorganic molecules makes colorimetric shifts, which allow the sensitive and accurate detection of proteins, lipids, toxins, nucleic acids, antibodies, and heavy metal ions [27,28]. Recently, Zeebaree et al. synthesized an easy-preparation, rapid, efficient, eco-friendly, and naked-eye colorimetric sensor of AgNPs using tree gum as a stabilizing and reducing agent to detect mercury ions in aqueous samples [29]. ...
The contamination of drinking water by heavy metals, such as arsenic and mercury, is a global concern. Herein, we have developed a sensitive, cost-effective, and novel 3D-printed microfluidic device featuring two V-channels (Hg-sensor and As-sensor) for naked-eye colorimetric detection of mercury and arsenic in water samples from Tigris River. In Hg-sensor, a rapid and eco-friendly colorimetric sensor of silver nanoparticles (AgNPs) has been prepared using Boswellia sacra extract as a stabilizing and reducing agent to selectively detect mercury ions. Several techniques have been used to characterize the morphology of the prepared nanosensor of AgNPs, as well as the optical properties. AgNPs decorated with Boswellia sacra molecules (AgNPs@BS) showed high sensitivity and selectivity detection of Hg (II) in river water samples, based on AgNPs’ aggregation and the converting brown color of AgNPs to colorless. In As-sensor, a colorimetric sensor was used to detect arsenic ions using leucomalachite (LMG) green dye, where arsenic (III) reacts with potassium iodate in an acidic medium to release iodine, which rapidly oxidizes LMG to malachite green (MG). The application of the microfluidic device for analysis at the point of collection was assessed utilizing colorimetric determination of mercury and arsenic, permitting free imaging of both sensors using a smartphone camera. The limit of detection (LOD) and limit of quantification (LOQ) of this method were reported to be 0.089 and 0.297 mg/L for Hg (II), and 0.042 and 0.143 mg/L for As (III), respectively. The calibration curve that ranged from 2 to 20 mg/L for Hg (II) and 1–15 mg/L for As (III) was obtained for the point of collection device, which reveals a good agreement (97%) with Sector Field ICP-MS.
Graphical Abstract
... The modified silver nanoparticle used as a sensor for diaveridine HCl determination was prepared in the same way as the previously reported works [41][42][43]. 0.1 mL of a 0.1 M silver nitrate solution was typically added dropwise to 100 mL of bi-distilled water while being constantly stirred. Subsequently, the solution was then spiked with 0.01 g NaBH 4 . ...
In this work, a new spectrophotometric ultrasonicated method was applied for the determination of diaverdine HCl (DIA). The process was based on a controlled preparation of silver nanoparticles stabilized with sodium dodecyl sulphate (SDS-AgNPs), and then the obtained solution was subjected for a definite time to ultrasonication, which in turn increased the absorbance of surface plasmon resonance (SPR), at λ max = 395 nm, by 50%. The analyte (DIA) was added to freshly sonicated SDS-AgNPs, and the DIA concentration was monitored with respect to the decreasing SPR absorption spectra. The obtained results and the mechanism of silver nanoparticle aggregation due to DIA addition were confirmed using the data obtained from FT-IR and TEM measurements. A spectrophotometric determination of DIA was valid with a linear range of 0.1-1.5 μg mL −1 with R 2 and relative standard deviation of 0.992 and 1.72%, respectively. The developed method was successfully applied for the monitoring of DIA in spiked bovine milk samples and a veterinary drug sample.
... 25 Yu and co-workers prepared silver nanoparticles from amido black 10b as sensors for a Cr 3+ assay. 26 As far as we know, there is no report about the fabrication and application of carbon dots originating from amido black 10b. The heterocyclic azo chemical structure with the reactive groups of sulfonic acid, hydroxyl, and amidogen in amido black 10b may be the ideal precursor for preparing CDs. ...
Herein, a one-step hydrothermal synthesis method was adopted to fabricate carbon dots (CDs) from amido black 10b in a sodium hydroxide solution. The morphology and composition of the CDs were investigated by XRD, FTIR TEM, XPS, UV-vis, and fluorescence spectroscopy. The obtained CDs (AB-CDs) with an average diameter of 19.4 nm displayed a well-dispersed characteristic in aqueous solutions. The as-prepared CDs showed bright blue fluorescence and good photostability, with a high quantum yield of 24.1%. AB-CDs displayed a selective and noticeable turn-off response to Fe3+. Accordingly, the quantitative detection of Fe3+ was achieved in the range of 5-200 μmol L-1 with a detection limit of 1.84 μmol L-1. The fluorescence response mechanism of Fe3+ to AB-CDs was ascribed to static quenching due to the emergence of the ground-state complex. Moreover, ascorbic acid could restore the fluorescence of AB-CDs quenched by Fe3+ by reducing Fe3+ to Fe2+. The developed nanoprobe was used to detect ascorbic acid with a limit of detection of 7.26 μmol L-1 in the range of 20-300 μmol L-1. Furthermore, the developed sensing system was successfully applied for an Fe3+ assay in a lake water sample and ascorbic acid detection in a human urine sample. The AB-CD-based analytical system showed its latent practical value in the chemical analysis and bioanalytical fields.
The selective quantitation of Cr(VI) was developed through colorimetric detection using starch-stabilized silver nanoparticles (starch-AgNPs). The detection of Cr(VI) was based on oxidative degradation of starch-AgNPs as the reduction of UV-Vis signal and the distinctive color change from yellow to colorless of starch-AgNPs were observed. To achieve the highest sensitivity by this method, pH 3, and only one minute were required for the determination of Cr(VI). For analytical performances, two linear ranges of 0 – 6 µM and 10 – 80 µM with limit of detection of 0.93 µM (48 µg/L) and 11.57 µM (0.60 mg/L) were obtained, respectively. The developed colorimetric method was combined with inductively coupled plasma optical emission spectroscopy (ICP-OES) for the speciation analysis of chromium. The concentration of Cr(III) was calculated by subtraction of Cr(VI) from the total chromium concentration determined by ICP-OES. A satisfactory accuracy and precision based on the AOAC guidelines also proved that this simple and rapid sensor was successfully applied for speciation of chromium in real water samples.
The purpose of the present research was to design a method for the colorimetric determination of cysteamine. We have employed cysteine-stabilized silver nanoparticles (AgNPs) as a probe. The addition of cysteamine resulted in the quenching of the 400 nm surface plasmon resonance (SPR) band of the AgNPs. It was accompanied by the appearance of a new absorption band at 560 nm. The colour of the colloidal AgNPs changed from yellow to dark brown within a few seconds. The change in colour of the AgNPs was due to their aggregation induced by the addition of cysteamine. Significantly, other biomolecules such as arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutathione, glycine, methionine and 6-mercaptopurine did not cause any change in the colour of the AgNPs. The limit of detection (LOD) of the method was 0.37 μM. The mechanism of the aggregation of the AgNPs induced by cysteamine has also been described. The method has been applied for the detection of cysteamine in human blood serum.
