Tartaric acid stabilized iridium nanoparticles with excellent laccase-like activity

Hao, Shanhao; Fu, Yong Qing; Guo, Zhanghong; Zhou, Lin; Song, Qijun

doi:10.1039/d2tb02798d

Cited by 11 publications

(7 citation statements)

References 56 publications

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“…Motivated by the fact, the substrate was further expanded to other aromatic amines, such as PPD, 1,5-NDA, 1,8-NDA, and 2-AA. In the presence of Cu-A nanozyme (20 mM BR, pH = 7), colorless PPD switched to dark purple, and a new absorption peak at 510 nm appeared, indicating that PPD was oxidized (Figure E). , For 1,5-NDA, the solution changed to pink-purple and a new absorption peak at 520 nm corresponding to oxidized 1,5-NDA was observed (Figure F). , Same results were also observed with 1,8-NDA and the solution turned brown (Figure G), , while for 2-AA, the solution changed to yellow, and the characteristic peak shifted from 425 nm to 433 nm with the absorption intensity increased, corresponding to oxidized 2-AA. , The results further depicted that Cu-A nanozyme could also catalyze the oxidation of PPD, 1,5-NDA, 1,8-NDA, and 2-AA. Similarly, the calculated K m was 0.07 mM (PPD), 0.207 mM (2-AA), 0.367 mM (1,8-NDA), and 0.631 mM (1,5-NDA), and V max was 3.69 μM/min (PPD), 3.55 μM/min (1,5-NDA), 1.59 μM/min (1,8-NDA), and 0.83 μM/min (2-AA) (Figure S7B–E).…”

Section: Resultssupporting

confidence: 52%

“…In the presence of Cu-A nanozyme (20 mM BR, pH = 7), colorless PPD switched to dark purple, and a new absorption peak at 510 nm appeared, indicating that PPD was oxidized (Figure 1E). 48,49 For 1,5-NDA, the solution changed to pink-purple and a new absorption peak at 520 nm corresponding to oxidized 1,5-NDA was observed (Figure 1F). 50,51 Same results were also observed with 1,8-NDA and the solution turned brown (Figure 1G), 52,53 while for 2-AA, the solution changed to yellow, and the characteristic peak shifted from 425 nm to 433 nm with the absorption intensity increased, corresponding to oxidized 2-AA.…”

Section: Catalytic Performance Of Cu-a Nanozyme As Amentioning

confidence: 99%

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Valence-Engineered Oxidase-Mimicking Nanozyme with Specificity for Aromatic Amine Oxidation and Identification

et al. 2023

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Oxidase-mimicking nanozymes with specificity for catalyzing oxidation of aromatic amines are of great significance for recognition of aromatic amines but rarely reported. Herein, Cu-A nanozyme (synthesized with Cu2+ as a node and adenine as a linker) could specifically catalyze oxidation of o-phenylenediamine (OPD) in Britton–Robinson buffer solution. Such a specific catalytic performance was also corroborated with other aromatic amines, such as p-phenylenediamine (PPD), 1,5-naphthalene diamine (1,5-NDA), 1,8-naphthalene diamine (1,8-NDA), and 2-aminoanthracene (2-AA). Moreover, the presence of salts (1 mM NaNO2, NaHCO3, NH4Cl, KCl, NaCl, NaBr, and NaI) greatly mediated the catalytic activity with the order of NaNO2 < blank ≈ NaHCO3 < NH4Cl ≈ KCl ≈ NaCl < NaBr < NaI, which was due to anions sequentially increasing interfacial Cu+ content via anionic redox reaction, while the effect of cations was negligible. With the increased Cu+ content, K m decreased and V max increased, indicating valence-engineered catalytic activity. Based on high specificity and satisfactory activity, a colorimetric sensor array with NaCl, NaBr, and NaI as sensing channels was constructed to identify five representative aromatic amines (OPD, PPD, 1,5-NDA, 1,8-NDA, and 2-AA) as low as 50 μM, quantitatively analyze single aromatic amine (with OPD and PPD as model analysts), and even identify 20 unknown samples with an accuracy of 100%. In addition, the performance was further validated through accurately recognizing various concentration ratios of binary, ternary, quaternary, and quinary mixtures. Finally, the practical applications were demonstrated by successfully discriminating five aromatic amines in tap, river, sewage, and sea water, providing a simple and feasible assay for large-scale scanning aromatic amine levels in environmental water samples.

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Section: Resultssupporting

confidence: 52%

Section: Catalytic Performance Of Cu-a Nanozyme As Amentioning

confidence: 99%

Valence-Engineered Oxidase-Mimicking Nanozyme with Specificity for Aromatic Amine Oxidation and Identification

et al. 2023

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“…In the presence of Cu-Adenine, colorless PPD turns dark purple in 50 mM Tris− HCl, and a new absorption peak at 517 nm appears, indicating that PPD is catalytically oxidized (Figure 2A). 55 For 1,5-NDA, the solution switches to pink-purple in 50 mM Tris−HCl and a new absorption peak at 508 nm corresponding to oxidized 1,5-NDA is detected (Figure 2B). 26 For 1,8-NDA, such oxidation is also observed in 50 mM Tris−HCl, expressed as the appearance of a new absorption peak at 514 nm and the solution switching from colorless to brown (Figure 2C).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For aromatic amines, PPD ( p -phenylenediamine), 1,5-NDA (1,5-naphthalenediamine), and 1,8-NDA (1,8-naphthalenediamine) are selected as substrates, respectively, and their corresponding catalytic oxidations are investigated in 50 mM Tris–HCl. In the presence of Cu-Adenine, colorless PPD turns dark purple in 50 mM Tris–HCl, and a new absorption peak at 517 nm appears, indicating that PPD is catalytically oxidized (Figure A) . For 1,5-NDA, the solution switches to pink-purple in 50 mM Tris–HCl and a new absorption peak at 508 nm corresponding to oxidized 1,5-NDA is detected (Figure B) .…”

Section: Resultsmentioning

confidence: 99%

Buffer Concentration-Dependent Catalytic Performance of Cu-Adenine Oxidase Mimic for Constructing Sensor Array for Identifying Aromatic Amines and Phenols

Gao,

Zhang,

Fang

et al. 2023

J. Phys. Chem. C

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Oxidase-mimicking nanozymes are some of the most important nanozymes, which are investigated in various buffer concentrations. However, buffer concentration-dependent catalytic performance is rarely investigated. Herein, with o-phenylenediamine (OPD) as a substrate, the catalytic performance of Cu-Adenine oxidase mimic (fabricated with Cu 2+ as an active center and adenine as a ligand) gradually decreases upon Tris−HCl buffer concentration (C Tris−HCl ) increasing from 10 to 200 mM, exhibiting buffer concentration-dependent catalytic activity. Such buffer concentration-dependent catalytic activity is believed to be because Tris−HCl and OPD competitively bind with Cu-Adenine, leading to differences in catalytic activity. Similarly, with 2,4-dichlorophenol (2,4-DP) as a substrate and 4-aminoantipyrine (4-AP) as a chromogenic agent, the same results are obtained. However, with 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 3,3′,5,5′tetramethylbenzidine (TMB) as substrates, the catalytic oxidation cannot be observed at C Tris−HCl ≥ 50 mM. Tris−HCl and substrate competitively binding with Cu-Adenine produces buffer concentration-dependent catalytic performance. Subsequently, substrates are successfully expanded to other aromatic amines (p-phenylenediamine (PPD), 1,5-naphthalenediamine (1,5-NDA), 1,8-naphthalenediamine (1,8-NDA)) and phenols (phenol, 3-cresol, 1-naphthol). Based on the results, with 50 and 150 mM Tris− HCl buffer solutions as sensing channels, a Cu-Adenine-based colorimetric sensor array is constructed for discriminating four representative aromatic amines (OPD, PPD, 1,5-NDA, 1,8-NDA) and four phenols (2, phenol, as low as 50 μM. The performance is further validated through accurately identifying binary, quaternary, and even senary and octonary mixtures. Finally, the designed sensor array is successfully applied for identifying eight representative aromatic amines and phenols in river water, seawater, and sewage water, presenting great potential and valuable applications for large-scale scanning levels of aromatic amines and phenols in water samples.

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“…11,12 Based on the laccase activity of Tar-IrNPs, a colourimetric method was developed for the detection and degradation of o -phenylenediamine (OPD) and p -phenylenediamine (PPD). 13…”

Section: Introductionmentioning

confidence: 99%

Malic acid-coated iridium nanoparticle-induced cascade enzymatic reactions for norepinephrine detection

Chen,

Zhou,

Guo

et al. 2024

Mater. Adv.

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Tartaric acid stabilized iridium nanoparticles with excellent laccase-like activity

Abstract: Iridium nanoparticles with an average size of 1.7 nm (Tar-IrNPs) were synthesized by the reduction of IrCl3 with NaBH4 in the presence of tartaric acid. As prepared Tar-IrNPs showed not...

Cited by 11 publications

References 56 publications

Valence-Engineered Oxidase-Mimicking Nanozyme with Specificity for Aromatic Amine Oxidation and Identification

Valence-Engineered Oxidase-Mimicking Nanozyme with Specificity for Aromatic Amine Oxidation and Identification

Buffer Concentration-Dependent Catalytic Performance of Cu-Adenine Oxidase Mimic for Constructing Sensor Array for Identifying Aromatic Amines and Phenols

Malic acid-coated iridium nanoparticle-induced cascade enzymatic reactions for norepinephrine detection

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