Influence of pH and aurate/amino acid ratios on the tuneable optical features of gold nanoparticles and nanoclusters

Csapó, Edit; Ungor, Ditta; Kele, Zoltán; Baranyai, Péter; Deák, Andréa; Juhász, Ádám; Janovák, László; Dékány, Imre

doi:10.1016/j.colsurfa.2017.02.047

Cited by 23 publications

(24 citation statements)

References 45 publications

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“…However, Yang et al [82] claimed that the emission intensity of the His-stabilized Au 10 NCs was continually decreased with the increase of pH (from pH = 1.0 to 13.0) and the extreme acidic condition (pH = 1–2) is optimal for these NCs. In contrast with their results, E. Csapó et al found that (Figure 3A), if the pH is smaller than pH = 5.0 no emission could be detected, but a characteristic emission peak with continually decreasing intensity to pH = 12.0 was evolved at 475 nm at above pH > 6 [71]. The emission maximum values show an interesting correlation with the concentration distribution curves of His.…”

Section: Synthetic Routes Of Amino Acid-reduced Fluorescent Au Ncscontrasting

confidence: 59%

“…1:5 metal ion to amino acid molar ratios. However, the reduction capability of Trp was previously identified [70], but E. Csapó et al clearly confirmed that the ratio of the precursor AuCl 4 ¯ and the bioligand greatly influences the optical feature of the formed colloids [71]. Using AuCl 4 ¯:Trp/1:0.4 molar ratio in alkaline medium (pH = 12.0), plasmonic Trp-Au NPs (λ abs = 530 nm) were formed (Figure 1B).…”

Section: Preparation Of Amino Acid-reduced Colloidal Au Nps Havingmentioning

confidence: 99%

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Reduction of Tetrachloroaurate(III) Ions With Bioligands: Role of the Thiol and Amine Functional Groups on the Structure and Optical Features of Gold Nanohybrid Systems

2019

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In this review, the presentation of the synthetic routes of plasmonic gold nanoparticles (Au NPs), fluorescent gold nanoclusters (Au NCs), as well as self-assembled Au-containing thiolated coordination polymers (Au CPs) was highlighted. We exclusively emphasize the gold products that are synthesized by the spontaneous interaction of tetrachloroaurate(III) ions (AuCl4¯) with bioligands using amine and thiolate derivatives, including mainly amino acids. The dominant role of the nature of the applied reducing molecules as well as the experimental conditions (concentration of the precursor metal ion, molar ratio of the AuCl4¯ ions and biomolecules; pH, temperature, etc.) of the syntheses on the size and structure-dependent optical properties of these gold nanohybrid materials have been summarized. While using the same reducing and stabilizing biomolecules, the main differences on the preparation conditions of Au NPs, Au NCs, and Au CPs have been interpreted and the reducing capabilities of various amino acids and thiolates have been compared. Moreover, various fabrication routes of thiol-stabilized plasmonic Au NPs, as well as fluorescent Au NCs and self-assembled Au CPs have been presented via the formation of –(Au(I)-SR)n– periodic structures as intermediates.

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Section: Synthetic Routes Of Amino Acid-reduced Fluorescent Au Ncscontrasting

confidence: 59%

Section: Preparation Of Amino Acid-reduced Colloidal Au Nps Havingmentioning

confidence: 99%

Reduction of Tetrachloroaurate(III) Ions With Bioligands: Role of the Thiol and Amine Functional Groups on the Structure and Optical Features of Gold Nanohybrid Systems

2019

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“…Peaks at 2710 and 1635 cm −1 were assigned to the stretching vibration of CH and CO, respectively . The peaks at 1463 and 1148 cm −1 were due to the vibration of imidazole ring and the bending vibration of NH on imidazole ring . The aforementioned peaks demonstrated the existence of amidogen, carboxyl, and imidazole ring on the surface of His‐Au NCs.…”

Section: Resultsmentioning

confidence: 95%

“…[17] The peaks at 1463 and 1148 cm −1 were due to the vibration of imidazole ring and the bending vibration of NH on imidazole ring. [18] The aforementioned peaks demonstrated the existence of amidogen, carboxyl, and imidazole ring on the surface of His-Au NCs. For MES-Au NCs, the peak at 3448 cm −1 was due to the stretching vibration of OH and the peaks at 3008 and 2887 cm −1 were attributed to the stretching vibrations of NH.…”

Section: Characterization Of His-au Ncs and Mes-au Ncsmentioning

confidence: 98%

Different Effects of His‐Au NCs and MES‐Au NCs on the Propagation of Pseudorabies Virus

et al. 2018

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In a previous work, gold nanoclusters (Au NCs) are found to inactivate RNA virus, but the effect of surface modification of Au NCs on its proliferation is still largely unknown. Here, the effect of surface modification of Au NCs on the proliferation of pseudorabies virus (PRV) by synthesizing two types of gold clusters with different surface modification, histidine stabilized Au NCs (His‐Au NCs) and mercaptoethane sulfonate and histidine stabilized Au NCs (MES‐Au NCs), is investigated. His‐Au NCs rather than MES‐Au NCs could strongly inhibit the proliferation of PRV, as indicated by the results of plaque assay, confocal microscopic analysis, Western blot assay, and quantitative real‐time polymerase chain reaction (PCR) assay. Further study reveals that His‐Au NCs perform the function via blockage of the viral replication process rather than the processes of attachment, penetration, or release. Additionally, His‐Au NCs are found to be mainly localized to nucleus, while MES‐Au NCs are strictly distributed in cytoplasm, which may explain why His‐Au NCs can suppress the proliferation of PRV, but not MES‐Au NCs. These results demonstrate that surface modification plays a key role in the antiviral effects of Au NCs and a potential antiviral agent can be developed by changing the Au NC surface modification.

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“…Both the spectra of MES-Au NCs and MES showed the stretching vibrations of O]S]O at 1251 and 1179 cm À1 , strongly suggesting that MES anchors on the surface of Au NCs through the sulfur atom and Au atom by the formation of Au-S bond. 34,35 Meanwhile, both gold clusters exhibited the characteristic IR bands of imidazole ring (imidazole stretches; 1464 cm À1 ) of histidine, 36 conrming the partial replacement of His-ligands on the surfaces of His-Au NCs by MES. The ligand exchange could be further veried by Xray photoelectron spectroscopy (XPS).…”

Section: Resultsmentioning

confidence: 99%

A novel gold-nanocluster-based fluorescent sensor for detection of sodium 2-mercaptoethanesulfonate

Feng

et al. 2019

RSC Adv.

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Influence of pH and aurate/amino acid ratios on the tuneable optical features of gold nanoparticles and nanoclusters

Cited by 23 publications

References 45 publications

Reduction of Tetrachloroaurate(III) Ions With Bioligands: Role of the Thiol and Amine Functional Groups on the Structure and Optical Features of Gold Nanohybrid Systems

Reduction of Tetrachloroaurate(III) Ions With Bioligands: Role of the Thiol and Amine Functional Groups on the Structure and Optical Features of Gold Nanohybrid Systems

Different Effects of His‐Au NCs and MES‐Au NCs on the Propagation of Pseudorabies Virus

A novel gold-nanocluster-based fluorescent sensor for detection of sodium 2-mercaptoethanesulfonate

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