A combined spectroscopic and <i>ab initio</i> study of the transmetalation of a polyphenol as a potential purification strategy for food additives

Maji, Tuhin Kumar; Bagchi, Damayanti; Pan, Nivedita; Sayqal, Ali; Morad, Moataz; Ahmed, Saleh A.; Karmakar, Debjani; Pal, Samir Kumar

doi:10.1039/c9ra10596d

Cited by 9 publications

(7 citation statements)

References 50 publications

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“…The UV-Vis absorbance spectra of the AgNPs in increasing order of concentration of nanosensor shown in Fig. 1 which is consistent with previously reported literature for citrate functionalized silver nanoparticles [39]. Dynamic light scattering has been performed for an idea of average hydrodynamic diameter of the AgNPs.…”

Section: Characterization Of Agnpssupporting

confidence: 89%

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticles Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

Pan

Maji

Banarjee

et al. 2021

Preprint

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Plasmonic nanoparticles are of great importance owing to their highly responsive ‘Localized Surface Plasmon Resonance’ (LSPR) behaviour to self-agglomeration/ aggregation leading to the development of various nanosensors. Herein we demonstrated the definite self-assembly of citrate functionalized silver nanoparticles (AgNPs) into a one-dimensional linear chain in presence of charged lead ions (Pb 2+ ), one of the most toxic heavy metal pollutants. We have explored detail mechanism using a variety of spectroscopic tools and electron microscopy. The self-aggregation of AgNPs leads to the generation of new LSPR modes due to coupling of nearby existing modes. The conclusion of our experimental findings is duly supported by our developed numerical modelling based on the quasi-static approximation that the generated new LSPR modes are solely due to formation of chain-like aggregation of AgNPs. We have also monitored the LSPR spectra in presence of other metal ions, however, only Pb 2+ found to give such unique self-assembled geometry may due to its high interaction affinity with citrate. These findings play a key role for citrate functionalised AgNPs to be used as a low cost highly selective and sensitive lead ion sensor for potential application in industrial lead pollution monitoring. We have further varied several sensor parameters such as AgNPs size, concentration and the allowed reaction time for it to be practically implemented as an efficient lead sensor meeting the Environmental Protection Agency recommendations.

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Section: Characterization Of Agnpssupporting

confidence: 89%

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticles Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

Pan

Maji

Banarjee

et al. 2021

Preprint

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“…Inset of Fig.1 (a)shows the pictorial image of yellow coloured colloidal AgNPs solution. The characteristic LSPR absorbance band of AgNP is found to be peaking at around 395 nm which is consistent with previously reported literature for citrate functionalized silver nanoparticles[39]. Dynamic light scattering has been performed for an idea of average hydrodynamic diameter of the AgNPs.…”

supporting

confidence: 89%

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticle Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

et al. 2021

Self Cite

View full text Add to dashboard Cite

Plasmonic nanoparticles are of great importance owing to their highly responsive 'Localized Surface Plasmon Resonance' (LSPR) behaviour to self-agglomeration/ aggregation leading to the development of various nanosensors. Herein we demonstrated the definite self-assembly of citrate functionalized silver nanoparticles (AgNPs) into a one-dimensional linear chain in presence of charged lead ions (Pb 2+ ), one of the most toxic heavy metal pollutants. We have explored detail mechanism using a variety of spectroscopic tools and electron microscopy. The self-aggregation of AgNPs leads to the generation of new LSPR modes due to coupling of nearby existing modes. The conclusion of our experimental findings is duly supported by our developed numerical modelling based on the quasi-static approximation that the generated new LSPR modes are solely due to formation of chain-like aggregation of AgNPs. We have also monitored the LSPR spectra in presence of other metal ions, however, only Pb 2+ found to give such unique self-assembled geometry may due to its high interaction affinity with citrate. These findings play a key role for citrate functionalised AgNPs to be used as a low cost highly selective and sensitive lead ion sensor for potential application in industrial lead pollution monitoring. We have further varied several sensor parameters such as AgNPs size, concentration and the allowed reaction time for it to be practically implemented as an efficient lead sensor meeting the Environmental Protection Agency recommendations.

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“…Apart from the effects of tannin structure and pH value, the binding capacities of different metal species are also diverse. In view of this difference, metals with low toxicity and strong binding ability can be used to replace the metals with high toxicity in the organism, so as to remove toxic metal pollution . The phenomenon that the water solubility of tannins is usually reduced during complexation means tannins can be precipitated by complexation with metal ions in aqueous solution .…”

Section: Introductionmentioning

confidence: 99%

“…In view of this difference, metals with low toxicity and strong binding ability can be used to replace the metals with high toxicity in the organism, so as to remove toxic metal pollution. 21 The phenomenon that the water solubility of tannins is usually reduced during complexation means tannins can be precipitated by complexation with metal ions in aqueous solution. 22 Plant tannins are widely used in the preparation of tannin/Fe dyes, metal rust-resistant coatings, water treatment agents, pesticides, and aluminum tannins.…”

Section: ■ Introductionmentioning

confidence: 99%

Effects of Metal Ions on the Precipitation of Penta-O-galloyl-β-d-glucopyranose by Protein

Zhang

Tang

et al. 2021

J. Agric. Food Chem.

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In this study, the effects of metal ions (Al3+, Fe2+, Cu2+, and Zn2+) on precipitation of a purified gallotannin 1,2,3,4,6-penta-O-galloyl-β-d-glucopyranose (PGG) by bovine serum albumin (BSA) were quantitatively analyzed. The stoichiometric ratios of the complexation of metal ions to PGG and methyl gallate (MeG) which can be defined as gallotannins monomer were also explored. The results showed that the addition of metal ions could reduce the solubility of PGG–protein complex and increase the PGG–protein precipitation. Precipitation studies showed that Al3+ and Fe2+ with a higher stoichiometric ratio to PGG and MeG had greater effects on PGG–protein precipitation than Cu2+ and Zn2+. The results of this study suggested that metal ions could combine with PGG to form PGG–metal complex and interact with protein to form PGG–metal–protein ternary complexes, which resulted in the increase of PGG–protein precipitation. Consequently, a model of interaction between metal ions and PGG–protein precipitation was proposed.

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A combined spectroscopic and ab initio study of the transmetalation of a polyphenol as a potential purification strategy for food additives

Abstract: A transmetalation mechanism for the removal of toxic Hg from a Hg–curcumin complex and the detection of the separated free Hg ions using the SPR band quenching of Ag-nanoparticles is shown.

Cited by 9 publications

References 50 publications

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticles Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticles Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticle Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection

Effects of Metal Ions on the Precipitation of Penta-O-galloyl-β-d-glucopyranose by Protein

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