A novel electrochemical sensor of DNAzyme/AuNPs/Fe/ZIF-8/GCE for Pb2+ detection in the soil solution with enhanced sensitivity, anti-interference and stability

Song, Peipei; Fan, Zhirui; Sun, Shuai; Sun, Chengye; Wang, Jun

doi:10.1016/j.jece.2024.112349

Cited by 5 publications

(1 citation statement)

References 42 publications

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“…These nanoparticles can be used to covalently immobilize organosulfur-containing recognition biomolecules such as oligonucleotides, aptamers, peptides, or antibodies, hence are often used in the field of biosensors to create self-assembled monolayers (SAMs) [ 5 – 7 ]. In case of biosensors, a high surface-to-volume ratio of AuNPs can increase recognition biomolecule loading, hence improving their analytical parameters [ 8 , 9 ]. Various methods of AuNP-based electrode fabrication such as electrodeposition, electrostatic attachment during drop-casting or immersion into solution of alternatively fabricated NPs, and mixing AuNPs into paste of paste electrodes were previously reported [ 10 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

Proving the automatic benchtop electrochemical station for the development of dopamine and paracetamol sensors

Haššo,

Kudr,

Zítka

et al. 2024

Microchim Acta

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The introduced work represents an implementation of the automatic benchtop electrochemical station (BES) as an effective tool for the possibilities of high-throughput preparation of modified sensor/biosensors, speeding up the development of the analytical method, and automation of the analytical procedure for the determination of paracetamol (PAR) and dopamine (DOP) as target analytes. Within the preparation of gold nanoparticles modified screen-printed carbon electrode (AuNPs-SPCE) by electrodeposition, the deposition potential EDEP, the deposition time tDEP, and the concentration of HAuCl4 were optimized and their influence was monitored on 1 mM [Ru(NH3)6]3+/2+ redox probe and 50 μM DOP. The morphology of the AuNPs-SPCE prepared at various modification conditions was observed by SEM. The analytical performance of the AuNPs-SPCE prepared at different modification conditions was evaluated by a construction of the calibration curves of DOP and PAR. SPCE and AuNPs-SPCE at modification condition providing the best sensitivity to PAR and DOP, were successfully used to determine PAR and DOP in tap water by “spike-recovery” approach. The BES yields better reproducibility of the preparation of AuNPs-SPCE (RSD = 3.0%) in comparison with the case when AuNPs-SPCE was prepared manually by highly skilled laboratory operator (RSD = 7.0%). Graphical abstract

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