Ni–Co Layered Double Hydroxide Nanocage-Mediated Reactive Oxygen Species Generation for Ultrasensitive Chemiluminescent Detection of Dopamine

Analytical Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Май 14, 2025

Chemiluminescence (CL), which generates stable and luminous light emissions, is vital for accurate dopamine (DA) detection. Additionally, catalysts play an essential role in the CL system's performance. Herein, nickel-cobalt layered double hydroxide hollow nanocages (Ni-Co LDHs) with peroxidase catalytic activities are well synthesized zeolitic imidazolate framework-67 (ZIF-67) nanocrystals serving as self-sacrificing templates. The metal active sites found on host layer of Ni-Co LDHs low redox potential Co3+/Co2+ enable good affinity towards hydrogen peroxide (H2O2). Decomposing H2O2 significant amounts reactive oxygen species (ROS), which, when utilized a luminol-based system, enhance response by impressive factor 952 times. Dopamine remarkably quenches produced luminol/H2O2/Ni-Co LDHs. Based concentration-dependent quenching intense LDH signal dopamine, we establish sensitive selective method detecting DA linear range 5-1000 nM, achieving limit detection 1.51 nM. developed method's practical efficacy was verified determining human serum. This study demonstrates that embrace great prospects analytical development.

Язык: Английский

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Indocarbocyanine dye-based ultrasensitive fluorescent turn-off probe for determination of nitrite in water and baby food

Microchemical Journal, Год журнала: 2025, Номер unknown, С. 114068 - 114068

Опубликована: Май 1, 2025

Язык: Английский

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Diazo-reaction based dual-mode colorimetric-electrochemical sensing of nitrite in pickled food

The Analyst, Год журнала: 2023, Номер 148(19), С. 4869 - 4876

Опубликована: Янв. 1, 2023

Development of an effective and convenient sensor for sensitive detection nitrites is great concern since excessive amounts can be harmful to both human health the environment. In this work, Cu-MOF modified exfoliated graphite paper (EGP) was employed as a signal reporter enable visual electrochemical dual-mode sensing nitrites. Cu-MOFs were in situ synthesized on EGP, which exhibited excellent oxidase enzyme-like activity oxidize 3,3',5,5'-tetramethylbenzidine (TMB) into its oxidation product (oxTMB). The multi-layer structure superior electrical conductivity EGP not only facilitated loading nanozyme colorimetric but also enabled use underlying backbone support electroanalysis. Based recognition nitrite through highly specific diazo reaction between oxTMB, addition caused solution change color from blue green, allowed with limit (LOD) 8.5 × 10-6 mol L-1. Meanwhile, Cu-MOF/EGP platform ratiometric based TMB. Compared mode, mode possessed higher sensitivity LOD 5.4 10-7 L-1, indicating high accuracy proposed strategy. Furthermore, determination different pickled food samples demonstrated.

Язык: Английский

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Black Phosphorus Quantum Dots with Exposed (113) Planes on Chemiluminescent Luminol–K₃Fe(CN)₆ for Detection of Dopamine

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(11), С. 12993 - 13003

Опубликована: Май 30, 2024

Exploring the possible catalytic effect of black phosphorus quantum dots (BPQDs) with specific exposed planes on chemiluminescence (CL) to improve CL intensity and achieve excellent analytical performance is one latest research hotspots. Herein, uniform BPQDs highly (113) facets an average size 2.2 nm were fabricated via a facile ultrasonic exfoliation strategy. The enhanced in BPQDs–luminol–K3Fe(CN)6 system attributed BPQDs. mechanism involved luminol–K3Fe(CN)6 revealed by theoretical calculations, which show adsorption Gibbs free energy for oxygen −0.86 eV, accompanied separation electron–hole pairs (e––h+). In other words, after being irradiated generated from luminol K3Fe(CN)6, effectively catalyze decomposition dissolved produce superoxide radical anions, further react increase emission. noticeable suppression signal presence dopamine acquired under mild conditions makes it attractive biosensor applications, deepening understanding as efficient catalysts promoting potential development BPQD-based materials fields photonics, biomedicine, electronics.

Язык: Английский

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Innovative electrochemical sensor based on platinum group metal complexes for determination of nitrite: application for simultaneous detection of nitrite and tartrazine

Journal of environmental chemical engineering, Год журнала: 2024, Номер 12(6), С. 114653 - 114653

Опубликована: Ноя. 8, 2024

Язык: Английский

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