Mathaweesansurn, Arjnarong
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Mathaweesansurn, Arjnarong
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arjnarong.ma@kmitl.ac.th
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Item type:Publication, A Ratiometric Fluorescence Amplification Using Copper Nanoclusters with o-Phenylenediamine Sensor for Determination of Mercury (II) in Natural Water(2023-06-01); ; A simple and rapid method for determining mercury (II) has been developed using L-cysteine-capped copper nanocluster (CuNCs) with o-phenylenediamine (OPD) as the sensor. The characteristic fluorescence peak of the synthesized CuNCs was observed at 460 nm. The fluorescence properties of CuNCs were strongly influenced by the addition of mercury (II). Upon addition, CuNCs were oxidized to form Cu<sup>2+</sup>. Then, the OPD were rapidly oxidized by Cu<sup>2+</sup> to form o-phenylenediamine oxide (oxOPD), as evidenced by the strong fluorescence peak at 547 nm, resulting in a decrease in the fluorescence intensity at 460 nm and an increase in the fluorescence intensity at 547 nm. Under optimal conditions, a calibration curve between the fluorescence ratio (I547/I460) and mercury (II) concentration was constructed with a linearity of 0–1000 µg L<sup>−1</sup>. The limit of detection (LOD) and limit of quantification (LOQ) were found at 18.0 µg L<sup>−1</sup> and 62.0 µg L<sup>−1</sup>, respectively. The recovery percentage was in the range of 96.8–106.4%. The developed method was also compared with the standard ICP-OES method. The results were found to be not significantly different at a 95% confidence level (t<inf>stat</inf> = 0.365 < t<inf>crit</inf> = 2.262). This demonstrated that the developed method could be applied for detecting mercury (II) in natural water samples. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ultrasonic-driven chemical reduction synthesis of alizarin complexone-modified gold nanoparticles for dual-signal colorimetric and fluorometric sensing of histamine in seafood products(2024-12-01); Alizarin complexone-modified gold nanoparticles (Au<sup>0</sup>-NPs<inf>ALz</inf>) were synthesized using a proposed ultrasonic irradiation-assisted chemical reduction method. Ultrasonic irradiation powers, reaction time and alizarin complexone concentration had been proven to be the main parameters for controlling the nucleation and growth of Au<sup>0</sup>-NPs<inf>ALz</inf>. In the synthesized ultrasonic irradiation-assisted chemical reduction conditions, Au<sup>0</sup>-NPs<inf>ALz</inf> had a spherical oriented morphology with a uniform size of 17.84 ± 1.37 nm and are shiny red with a surface plasmon resonance (SPR) of 535 nm. A rapid colorimetric and fluorometric dual-mode detection strategy for selective detection of histamine in seafood was developed based on the self-assembly of Au<sup>0</sup>-NPs<inf>ALz</inf>-Ni (II) complexes. Ni (II) can capture the histamine molecules close to Au<sup>0</sup>-NPs<inf>ALz</inf> surfaces, making changes in the colorimetric and fluorometric responses of the solution. The quantitative analysis of histamine was realized through the variation of dual-signal colorimetric and fluorometric responses. Such Au<sup>0</sup>-NPs<inf>ALz</inf> sensor offered good detection sensitivity for histamine with a detection limit (LOD) of 59.32 μmol L<sup>−1</sup> and 116.20 μmol L<sup>−1</sup> and wide linear response within the range of 10–10000 μmol L<sup>−1</sup> (R<sup>2</sup> = 0.9952) and 100–5000 μmol L<sup>−1</sup> (R<sup>2</sup> = 0.9947) for colorimetric and fluorometric measurement, respectively. Recoveries ranging from 94.99 to 103.29 % and 97.67–106.88 % for colorimetric and fluorometric assay were obtained, showing low levels of matrix effects. Particularly, the results of the dual-mode sensor were also validated by comparing with the HPLC method for improving the assay accuracy and dependability. Ultimately, the developed Au<sup>0</sup>-NPs<inf>ALz</inf> colorimetric and fluorometric probe performs excellently in practical applications, with promising results for detecting histamine in seafood products.