Fibrinogen-templated gold nanoclusters for fluorometric determination of cysteine and mercury(II)

Suo, Zhiguang; Hou, Xialing; Hu, Ziheng; Liu, Yihao; Xing, Feifei; Feng, Lingyan

doi:10.1007/s00604-019-3919-2

Cited by 26 publications

(10 citation statements)

References 36 publications

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“…The fluorescence quantum yield (QY) of CQDs−Au NCs (λ ex =320 nm, λ em =680 nm) is approximately 11.9% and close to Au NCs (11.6%) which are calculated by an absolute method. The average lifetime (

τ_{normala normalv}

) of CQDs−Au NCs was found to be 1.32 μs, which was approximate to that of Au NCs (1.40 μs) and higher than CQDs (Figure S5) . The pH effect on the fluorescence ratio of CQDs−Au NCs demonstrated almost obvious change in solutions pH rangeing from 3 to 13.…”

Section: Resultsmentioning

confidence: 77%

“…The average lifetime (t av ) of CQDsÀ Au NCs was found to be 1.32 μs, which was approximate to that of Au NCs (1.40 μs) and higher than CQDs (Figure S5). [29] The pH effect on the fluorescence ratio of CQDsÀ Au NCs demonstrated almost obvious change in solutions pH rangeing from 3 to 13. And, the CQDsÀ Au NCs was also reveals excellent stability in the salt concentration ranging from 0.2 M to 2 M (Figure S6).…”

Section: Characterizations Of Cqds-au Ncsmentioning

confidence: 96%

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Ratiometric Assays for Acetylcholinesterase Activity and Organo‐Phosphorous Pesticide Based on Superior Carbon Quantum Dots and BLGF‐Protected Gold Nanoclusters FRET Process

et al. 2020

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A ratiometric fluorescence system is reported based on fluorescence resonance energy transfer (FRET) between carbon quantum dots (CQDs) and gold nanoclusters (Au NCs) for sensitive detection of acetylcholinesterase (AChE) and organophosphorus pesticides (OPPs). The CQDs and Au NCs were synthesized by one-pot approach, emitting at 420 nm (λ ex = 320 nm) and 680 nm (λ ex = 500 nm) respectively. To verify the effect on CQDsÀ Au NCs of biothiols, the thiol sensing was performed by measuring the ratio of F 680 /F 420 as the increasing of cysteine as model, which shows a low detection limit of 1.07 μmol L À 1 . Herein, this sensing system was employed to determine AChE activity depend on its hydrolysis for acetylcho-line (ATCh) generated thiocholine. The AChE activity can be assayed as low as 1.08 mU mL À 1 within a wide linear range from 3 to 50 mU mL À 1 and evaluated in practical samples. In addition, a kind of organophosphorus pesticide, hypertoxic diazinon, was selected to efficiently inhibit the ATCh hydrolysis, and can be detected based on this proposed strategy. As far as we known, the proposed ratiometric assay system based on CQDsÀ Au NCs nanocomposites is the first time to demonstrate for AChE and OPPs assay. We believed that this promising strategy will opens up a novel pathway of using CQDs and Au NCs for the expanded biosensing applications.

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τ_{normala normalv}

Section: Resultsmentioning

confidence: 77%

Section: Characterizations Of Cqds-au Ncsmentioning

confidence: 96%

Ratiometric Assays for Acetylcholinesterase Activity and Organo‐Phosphorous Pesticide Based on Superior Carbon Quantum Dots and BLGF‐Protected Gold Nanoclusters FRET Process

et al. 2020

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“…Figure 3 h, shows the deconvoluted Au 4 f spectra, with peaks at 84.6, 86.1, 87.5 and 90.5 eV. The peaks at (84.6 and 87.5 eV), are for Au 4 f 7/2, Au 4 f 5/2 of Au 0 (binding energy difference of about 3.0 eV) while the peaks (86.1 and 90.5 eV) are for Au 4 f 7/2, Au 4 f 5/2 of Au + respectively 42 , 43 . The small peak of Au + , shows that there existed some un-reduced Au salts, in the TA/PUL-AuNPs colloidal solution.…”

Section: Resultsmentioning

confidence: 95%

Toxic Ag+ detection based on Au@Ag core shell nanostructure formation using Tannic acid assisted synthesis of Pullulan stabilized gold nanoparticles

Jayeoye

Supachettapun

Muangsin

2023

Sci Rep

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Herein, a sensitive colorimetric detection strategy is proposed for Ag+ detection based on the use of environmentally friendly synthesis of gold nanoparticles (AuNPs), at room temperature, using (tannic acid, TA), as the reductant and pullulan (PUL) as stabilizing agent. The colloidal solution (TA/PUL-AuNPs), at the optimal synthesis conditions, showed maximum absorbance at 529 nm with a berry red color. TEM and FESEM validated that the particles are spherical and monodispersed, while other characterization results elucidated the role of pullulan in the nano-synthesis. Ag+ addition to the probe (TA/PUL-AuNPs), pH 11, resulted in naked-eye color changes, owing to Au@Ag core shell nanostructure formation. Further, the added Ag+ is reduced to AgNPs, on the surface of the TA/PUL-AuNPs probe. A hypsochromic shift in the absorption maximum, from 529 to 409 nm was observed, while (AAg+-Abl)@409 nm exhibited linearity with Ag+ concentrations, from 0.100 to 150 µM. The estimated limit of detection was 30.8 nM, which is far lower than the acceptable limit of 0.930 µM from the regulatory agency. The TA/PUL-AuNPs probe was further tested for Ag+ detection in lake water samples, and it displayed satisfactory detection performances for real sample applications.

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“…46,62 Furthermore, the effect of Cys and GSH can be selectively eliminated by using N -ethylmaleimide (NEM) as a thiol-masking agent. 14,63,64…”

Section: Resultsmentioning

confidence: 99%

Dual-emissive phenylalanine dehydrogenase-templated gold nanoclusters as a new highly sensitive label-free ratiometric fluorescent probe: heavy metal ions and thiols measurement with live-cell imaging

Shahrashoob,

Hosseinkhani,

Jafary

et al. 2023

RSC Adv.

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Fibrinogen-templated gold nanoclusters for fluorometric determination of cysteine and mercury(II)

Cited by 26 publications

References 36 publications

Ratiometric Assays for Acetylcholinesterase Activity and Organo‐Phosphorous Pesticide Based on Superior Carbon Quantum Dots and BLGF‐Protected Gold Nanoclusters FRET Process

Ratiometric Assays for Acetylcholinesterase Activity and Organo‐Phosphorous Pesticide Based on Superior Carbon Quantum Dots and BLGF‐Protected Gold Nanoclusters FRET Process

Toxic Ag+ detection based on Au@Ag core shell nanostructure formation using Tannic acid assisted synthesis of Pullulan stabilized gold nanoparticles

Dual-emissive phenylalanine dehydrogenase-templated gold nanoclusters as a new highly sensitive label-free ratiometric fluorescent probe: heavy metal ions and thiols measurement with live-cell imaging

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